Magnum Energy MMS S User Manual

MMS Series Inverters/Chargers

Owner’s Manual

Disclaimer of Liability

The use of this manual and the conditions or methods of installation, operation, use, and maintenance of the MMS Series inverter/ charger are beyond the control of Magnum Energy, Inc. Therefore, this company assumes no responsibility and expressly disclaims any liability for loss, damage, or expense whether direct, indirect, consequential, or incidental that may arise out of or be in any way connected with such installation, operation, use, or maintenance.

Due to continuous improvements and product updates, the images shown in this manual may not exactly match the unit purchased.

Restrictions on Use

The MMS Series inverter/charger may only be used in life support devices or systems with the express written approval of Magnum Energy. Failure of this inverter can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system. If the MMS Series inverter fails, it is reasonable to assume that the health of the user or other persons may be endangered.

Document Information

Description – MMS Series Owner’s Manual Part Number and Revision – 64-0036 Rev B Date Published – March 2014

This entire manual is available for download—with many of the diagrams available in color—under the Document Library tab on our website at:

www.magnumenergy.com

Contact Information

Magnum Energy, Inc. 2211 West Casino Rd. Everett, WA 98204 Phone: (425) 353-8833 Fax: (425) 353-8390

Record the unit’s model and serial number in case you need to provide this information in the future.

Model: Serial Number:

MMS1012 U1

MMS1012-G U1

Conventions Used in this Manual (terminology)

Shorepower or External AC power – refers to alternating current

(AC) provided by the utility electric power grid or from a generator.

Mobile application – refers to inverters used in a recreational vehicle

(RV), boat, or a truck installation.

Safety Symbols

To reduce the risk of electrical shock, ﬁ re, or other safety hazard, the following safety symbols have been placed throughout this manual to indicate dangerous and important safety instructions.

WARNING: This symbol indicates that failure to take a speciﬁ ed action could result in physical harm to the user.

CAUTION: This symbol indicates that failure to take a speciﬁ ed action could result in damage to the equipment.

Info: This symbol indicates information that emphasizes

or supplements important points of the main text.

IMPORTANT PRODUCT SAFETY INSTRUCTIONS

This manual contains important safety instructions that must be followed during the installation and operation of this product. Read all instructions and safety information contained in this manual before installing or using this product.

• All electrical work must be performed in accordance with local, state, and federal electrical codes.

• This product is designed for indoor/compartment installation. DO NOT expose to rain, snow, moisture, or liquids of any type.

• Use insulated tools to reduce the chance of electrical shock or accidental short circuits.

• Remove all jewelry (such as rings, watches, bracelets, etc.,) when installing or performing maintenance on the inverter.

• Always disconnect the batteries or energy source prior to installing or performing maintenance on the inverter. Live power may be present at more than one point since an inverter utilizes both batteries and AC. Turning off the inverter may not reduce this risk. As long as AC power is connected, it will pass through the inverter regardless of the ON/OFF power switch setting.

• Always verify proper wiring prior to starting the inverter.

• Do not operate the inverter if it has been damaged.

• Do not dismantle the inverter; there are no user-serviceable parts contained in this product. Attempting to service the unit yourself could cause electrical shock. Internal capacitors remain charged after all power is disconnected.

• No AC or DC disconnects are provided as an integral part of this inverter. Both AC and DC disconnects must be provided as part of the system installation.

• No overcurrent protection for the battery supply is provided as an integral part of this inverter. Overcurrent protection of the battery cables must be provided as part of the installation.

• No overcurrent protection for the AC output wiring is provided as an integral part of this inverter. Overcurrent protection of the AC output wiring must be provided as part of the installation.

IMPORTANT BATTERY SAFETY INSTRUCTIONS

• Wear eye protection (safety glasses) when working with batteries.

• Remove all jewelry such as rings, watches, bracelets, etc., when installing or performing maintenance on the batteries.

• Never work alone. Always have someone near you when working around batteries.

• Use proper lifting techniques when working with batteries.

• Never use old or untested batteries. Check each battery’s label for age, type, and date code to ensure all batteries are identical.

• Batteries are sensitive to changes in temperature. Always install batteries in a stable environment.

• Install batteries in a well ventilated area. Batteries can produce explosive gasses. For compartment or enclosure installations, always vent batteries to the outside.

• Provide at least one inch (2.5 cm) of air space between batteries to provide optimum cooling.

• Never smoke when in the vicinity of batteries.

• To prevent a spark at the battery and to reduce the chance of explosion, always connect the cables to the batteries ﬁ rst. Then connect the cables to the inverter.

• Use insulated tools at all times.

• Always verify proper polarity and voltage before connecting the batteries to the inverter.

• To reduce the chance of ﬁ re or explosion, do not short-circuit the batteries.

• In the event of accidental exposure to battery acid, wash thoroughly with soap and water. In the event of exposure to the eyes, ﬂ ood them for at least 15 minutes with running water and seek immediate medical attention.

• Recycle old batteries.

SAVE ALL INSTRUCTIONS

iii

Table of Contents

1.0 Introduction ................................................................1

1.1 MMS Series Models ................................................... 1

1.2 How an Inverter/Charger Works ................................. 2

1.2.1 Inverter Applications for Mobile Installations ................ 2

1.3 Advantages of a Pure Sine vs Modiﬁ ed Sine Inverter ..... 2

1.4 Appliances and Run Time .......................................... 2

1.5 Standard Features and Beneﬁ ts ................................. 3

1.5.1 Battery Temperature Sensor ...................................... 6

2.0 Installation .................................................................7

2.1 Pre-Installation ........................................................ 7

2.1.1 Unpacking and Inspection ......................................... 7

2.1.2 Locating and Mounting the Inverter ...........................10

2.1.3 Wiring Guidelines ....................................................13

2.2 DC Wiring ..............................................................14

2.2.1 DC Wire Sizing ........................................................14

2.2.2 DC Overcurrent Protection ........................................14

2.2.3 DC Grounding .........................................................16

2.2.4 DC Cable Connections ..............................................16

2.3 Battery Bank Wiring ................................................18

2.3.1 Inverter to Battery Bank Wiring ................................18

2.4 AC Wiring ..............................................................20

2.4.1 Neutral to Safety Ground Bonding .............................20

2.4.2 AC Wiring Connections .............................................20

2.4.3 AC Wire Size and Overcurrent Protection ....................21

2.4.4 AC Input Wiring ......................................................22

2.4.5 AC Output Wiring ....................................................24

2.5 Functional Test .......................................................25

3.0 Operation ..................................................................27

3.1 Operating Modes .....................................................27

3.1.1 Inverter Mode .........................................................27

3.1.2 Standby Mode ........................................................28

3.2 Battery Temperature Sensor Operation.......................31

3.3 Protection Circuitry Operation ...................................32

3.4 Inverter Startup ......................................................33

3.5 Factory Default Settings ...........................................34

4.0 Maintenance and Troubleshooting ............................36

4.1 Recommended Inverter and Battery Care ...................36

4.2 RV/Marine Off-Season Storage ..................................36

4.3 Resetting the Inverter ..............................................37

4.4 Troubleshooting ......................................................38

5.0 Speciﬁ cations ............................................................39

Table of Contents (cont.)

A-1 Optional Equipment and Accessories .........................40

B-1 Battery Information ..................................................41

C-1 Warranty/Service Information ..................................44

C-1.1 Limited Warranty ....................................................44

C-1.2 How to Receive Repair Service ..................................45

List of Figures

Figure 1, MMS1012 Model Inverter/Charger .............................. 3

Figure 2, MMS1012-G Model Inverter/Charger ........................... 3

Figure 3, Top and Left Side Features ........................................ 4

Figure 4, Front and Back Side Features ..................................... 5

Figure 5, Battery Temperature Sensor (BTS) ............................. 6

Figure 6, MMS1012 Model Basic Installation Diagram ................. 8

Figure 7, MMS1012-G Model Basic Installation Diagram .............. 9

Figure 8, Approved MMS1012 (-G) Mounting Orientations .........12

Figure 9, MMS1012 Model Inverter/Charger Dimensions ............12

Figure 10, MMS1012-G Model Inverter/Charger Dimensions .......13

Figure 11, DC Cable to Battery Terminals .................................17

Figure 12, DC Cable to Inverter’s DC Terminals .........................17

Figure 13, AC Wiring Connections (MMS1012 model) .................23

Figure 14, AC Hardwiring Connections (MMS1012-G model) .......23

Figure 15, Warning Label .......................................................25

Figure 16, Automatic 4-Stage Charging Graph ..........................30

Figure 17, BTS Temperature to Charge Voltage Change ..............31

Figure 18, Resetting the Inverter ............................................37

Figure 19, Series Battery Wiring .............................................41

Figure 20, Parallel Battery Wiring ............................................42

Figure 21, Series-Parallel Battery Wiring ..................................42

Figure 22, Battery Bank Wiring Examples (12 volt) ...................43

List of Tables

Table 1, Recommended DC Wire/Overcurrent Device .................15

Table 2, DC Wire Size For Increased Distance ...........................15

Table 3, Wire Color to AC Wire Connection ...............................21

Table 4, Minimum Wire Size to Circuit-breaker Size ...................22

Table 5, Inverter Battery Turn On/Off Levels .............................33

Table 6, Inverter/Charger Default Settings ...............................35

Table 7, Troubleshooting Guide ...............................................38

Table 8, MMS Series Speciﬁ cations ..........................................39

Introduction

1.0 Introduction

Congratulations on your purchase of an MMS Series inverter/charger from Magnum Energy, Inc. This product is designed especially for your mobile application. Powerful, yet simple to use, this product will provide you with years of trouble-free use.

1.1 MMS Series Models

MMS1012 – a 1000 watt inverter/charger with 20-amp AC transfer

capability and a 50-amp, 4-stage Power Factor Correction (PFC) charger. The AC input and output are provided with pigtail wires to allow hardwiring to a main AC distribution panel and to an inverter sub-panel. Features isolated input/output neutrals for mobile applications. Includes a 15-foot battery temperature sensor.

Figure 1, MMS1012 Model Inverter/Charger

MMS1012-G – a 1000 watt inverter/charger with 20-amp AC transfer

capability and a 50-amp, 4-stage PFC charger. The AC input is provided by a standard 3-foot plug-in power cord, and the AC output is provided by a standard GFCI two plug outlet. Features isolated input/output neutrals for mobile applications. Includes a 15-foot battery temperature sensor.

Figure 2, MMS1012-G Model Inverter/Charger

Introduction

1.2 How an Inverter/Charger Works

An inverter takes direct current (DC) from your batteries and turns it into alternating current (AC), like you use at home. With MMS Series models, it also takes alternating current (when connected to a generator or to shorepower) and transforms it into direct current to recharge your batteries.

The two modes of operation associated with this inverter/charger are referred to in this document as:

Inverter Mode: DC from the batteries is transformed into pure sine

wave AC for powering your mobile applications.

Standby Mode: The unit operates as a battery charger to convert

incoming AC power into DC power to recharge the batteries while continuing to pass the incoming AC power directly to the inverter’s output, to power any AC loads.

1.2.1 Inverter Applications for Mobile Installations

Inverters can be used to provide power in mobile situations—RV, truck, or boat. In these applications, the inverter provides power to the AC loads using the energy stored in the batteries and recharges the batteries when shorepower or an onboard generator is available.

1.3 Advantages of a Pure Sine Wave vs Modiﬁ ed Sine

Wave Inverter

Today’s inverters come in two basic output waveforms: modiﬁ ed sine wave (which is actually a modiﬁ ed square wave) and pure sine wave.

Modiﬁ ed sine wave inverters approximate a pure sine waveform and will run most appliances and electronics without any problems. These inverters are less expensive and, therefore, offer a viable alternative to more expensive pure sine wave inverters.

The output of a pure sine wave inverter is equal to, or in many cases, better than the shorepower used in your home. Virtually any electronic device will operate from a pure sine wave inverter. Motors run cooler, microwaves usually cook faster, and clocks keep better time just to name a few examples. Without compromising quality or performance, the MagnaSine provides you with all of the advantages of a pure sine wave inverter at a much lower cost than many on the market.

1.4 Appliances and Run Time

The MMS Series inverter/charger can power a wide range of household appliances. As with any appliance using batteries for power, there is a certain length of time that it can run—this is called “run time”. Actual run time depends on several variables including the size and the type of appliance, the type of batteries installed in your application, as well as the battery’s capacity and age. Other factors such as the battery’s state of charge and temperature can also affect the length of time your appliances can run.

Introduction

Depending on your inverter capacity, larger electrical appliances such as coffee pots and hair dryers can be used for short durations. However, loads that are used for longer periods such as stoves or water heaters can quickly drain your batteries and are not recommended for inverter applications.

All electrical appliances are rated by the amount of power they consume. The rating is printed on the product’s nameplate label, usually located on its chassis near the AC power cord. Even though it is difﬁ cult to calculate exactly how long an inverter will run a par- ticular appliance, the best advice is trial and error. Your MMS Series inverter/charger has a built-in safeguard that automatically protects your batteries from being over-discharged.

1.5 Standard Features and Beneﬁ ts

The MMS Series inverter/charger converts 12 volts of direct cur-

rent (VDC) power from your battery to 120 volts alternating current (VAC) power.

power using Power Factor Correction (PFC) technology to keep the inverter’s battery bank fully charged. This inverter is designed to allow easy installation and use, and with its die-cast aluminum baseplate it ensures maximum durability and cooler, more efﬁ cient operation.

The multi-stage battery charger optimizes incoming AC

The inverter/charger provides the following:

• 1000 watts continuous at 25°C.

• Numerous protection features to provide a safe and peace-of-

mind operation.

• AC transfer switch circuitry; allowing incoming AC power to

continue to pass-thru to power loads even if the inverter is off.

• Dead battery charging for batteries that are extremely low.

• Automatic 4-stage battery charger with power factor correction

and temperature compensation—for optimum battery charging (using the temperature sensor).

• Modern and aesthetically pleasing design with a large AC wiring

compartment (provides easy access to AC wiring for simple and quick connections) and 360° DC connection terminals with color coded insulating covers.

• True RMS output voltage regulation to ensure the inverter will

deliver the correct amount of power—within the DC input voltage range and the continuous output power level.

• Quick connection accessory and remote ports—easily accepts sev-

eral optional remote controls and the battery temperature sensor.

Introduction

1 2

Figure 3, Top and Left Side Features

1. Inverter Status Indicator – a green LED that illuminates to

provide information on the inverter’s operation.

2. Power Switch – a momentary pushbutton switch that turns the

inverter on or off.

3. Negative DC Terminal (black) – the inverter’s connection to

the negative terminal on the battery bank.

4. Positive DC Terminal (red) – the inverter’s connection to the

positive terminal on the battery bank.

5. Input Circuit Breaker – a circuit breaker that protects the unit’s

internal wiring and pass-thru relay.

6. Output Circuit Breaker – a circuit breaker that provides another

layer of overload protection. Not a branch circuit-rated breaker. Separate AC output breakers may be required on the output.

7. Mounting Flanges (x4) – secure the inverter to shelf/wall.

8. AC Wiring Compartment - provides access for all AC input and

output connections on the inverter.

9. AC Output Connection – AC knockout for hardwiring AC output.

10. AC Input Connection

input. The strain relief comes with an attached ﬂ exible AC input power cord on the MMS1012-G model.

11. DC Ground Terminal – a connection that is used to tie the

exposed chassis of the inverter to the DC grounding system. This terminal accepts CU/AL conductors from #14 AWG (2.1 mm²) to #6 AWG (13.3 mm²).

12. GFCI Outlet – Ground Fault Circuit Interrupter outlet (with test

and reset capability). Only available on MMS1012-G model.

– a strain relief clamp for hardwiring AC

Introduction

Front Side

Back Side

Figure 4, Front and Back Side Features

13. Warning and Information Label – provides pertinent

information for safely using the inverter.

14. REMOTE Port Connection – a RJ11 connector that allows an

optional remote control to be connected.

15. ACCESSORY PORT Connection – a RJ11 connector to allow

the Battery Temperature Sensor (BTS) or MMS accessories (e.g., MM-DCLD, MM-ISA) to be connected.

16. Intake Vent – ventilation openings to pull in air to keep the

inverter cool for peak performance.

17. Exhaust Vent – ventilation openings that allow heated air to be

removed by the internal cooling fan.

18. Model/Serial Number Label – includes model/serial number

and provides speciﬁ cations and information on the inverter and charger. See the MMS Series Speciﬁ cations on page 39 for more information and the different models available.

FRONT VIEW

SIDE VIEW

~2" (5.1 cm)

~1"

~½”

0.375" diameter

Cable

~¾”

(2.5 cm)

(.95 cm)

(1.9 cm)

(1.3 cm)

Introduction

1.5.1 Battery Temperature Sensor

A plug-in external Battery Temperature Sensor (BTS) is provided for units with the battery charger feature. When installed, the BTS automatically adjusts the battery charger’s BULK, ABSORB, and FLOAT voltage set-points (based on temperature) for better charging performance and longer battery life. If the temperature sensor is NOT installed and the batteries are subjected to large temperature changes, battery life may be shortened.

Figure 5, Battery Temperature Sensor (BTS)

Installation

2.0 Installation

2.1 Pre-Installation

Before installing the inverter, read the entire Installation section. The

more thorough you plan in the beginning, the better your inverter needs will be met.

WARNING: Installations should be performed by qualiﬁ ed

personnel, such as a licensed or certiﬁ ed electrician. It is the installer’s responsibility to determine which safety codes apply and to ensure that all applicable installation requirements are followed. Applicable installation codes vary depending on the speciﬁ c location and the type of installation.

Info: Review the Important Product Safety Information on page ii and the Important Battery Safety Instructions

on page iii before any installation.

The basic system diagrams shown in Figures 6 and 7

reviewed to assist you in planning and designing your installation.

2.1.1 Unpacking and Inspection

Carefully remove the MMS inverter/charger from its shipping container and inspect all contents. Verify the following items are included:

• MMS Series inverter/charger

• Red and black DC terminal covers

• AC access cover with two screws

• Two 5/16-18 hex-head kep nuts (installed on the DC terminals)

• Battery Temperature Sensor (BTS)

• MMS Series Owner’s Manual

• Warning Label

If items appear to be missing or damaged, contact your authorized Magnum Energy dealer or Magnum Energy.

If at all possible, keep your shipping box. It will help protect your inverter from damage if it ever needs to be returned for service.

Save your proof-of-purchase as a record of your ownership; it will also be needed if the unit should require in-warranty service.

should be

Record the unit’s model and serial number in the front of this manual in case you need to provide this information in the future. It is much easier to record this information now, instead of trying to gather it after the unit has been installed.

Installation

Main Panel

Sub-Panel

(optional)

AC IN

OUT

Ground

disconnect

and

overcurrent

device

Outlet

Battery

Bank

VCR

Tools

AC Loads

Figure 6, MMS1012 Model Basic Installation Diagram

Installation

AC IN

AC Loads

VCR

Tools

OUT

Ground

disconnect

and

overcurrent

device

Battery

Bank

Figure 7, MMS1012-G Model Basic Installation Diagram

Installation

2.1.2 Locating and Mounting the Inverter

WARNINGS:

• Do not mount the inverter near any ﬂ ammable or combustible ﬂ uid or components.

• Provide adequate clearance/ventilation to the inverter.

• Mount only on a non-combustible surface.

• Maximum ambient temperature around the inverter must not exceed 77°F (25°C) to meet power speciﬁ - cations.

The inverter should only be installed in a location that meets the following requirements:

Clean and Dry – The inverter should not be installed in an area that

allows

ventilation openings. The area also must be free from any risk of condensation, water,

inverter. The inverter uses stainless steel fasteners, plated copper busbars, and a power-coated aluminum base. Also, the internal circuit boards are conformal coated. The above measures are undertaken to help ﬁ ght the harmful effects of corrosive environments. However, the life of the inverter is uncertain if used in any of these types of environments, and inverter failure under these conditions is not covered under warranty.

dust, fumes, insects, or rodents to enter or block the inverter’s

or any other liquid that can enter or fall on the

Cool – The inverter should be

sun or any equipment that produces extreme heat.

protected from direct exposure to the

The ambient air

temperature should be between 32°F (0°C) and 104°F (40°C); keep in mind that the inverter’s output speciﬁ cations are rated at 77°F (25°C), so the cooler the better within this range.

Ventilated – In order for the inverter to provide full output power

and avoid over-temperature fault conditions, do not cover or block the inverter’s ventilation openings or install this inverter in an area with limited airﬂ ow. Allow as much clearance around the inverter’s intake and exhaust ventilation openings as possible (see Figure 4, Items 16 & 17). At the minimum, allow an airspace clearance of 3” (7.5 cm) on all sides to provide adequate ventilation.

If installed in an enclosure, a fresh air intake opening must be provided directly to the front side (intake vent) and an exhaust opening on the back side (exhaust vent) of the inverter. This will allow cool air from the outside to ﬂ ow into the inverter, and heated air to exit away from the inverter and the enclosure. When mounted in an enclosed compartment, airﬂ ow must be at least 59 cfm in order to maintain no more than a 68°F (20°C) rise in compartment temperature. Minimum clearances can be reduced if airﬂ ow is increased, but in no case should clearance around the inverter be less than 2” (5 cm) on all sides.

Installation

Safe – Keep any ﬂ ammable/combustible material (e.g., paper, cloth,

plastic, etc.) that may be ignited by heat, sparks, or ﬂ ames at a minimum distance of 2 feet (60 cm) from the inverter.

WARNING: The MMS inverter/charger is not an ignition-

protection rated device and should not be installed in any location that requires ignition-protected equipment. To prevent ﬁ re or explosion, do not install the MMS inverter in any area with extremely ﬂ ammable liquids like gasoline or propane; or, in an area that contains connections between components of a fuel system.

Close to the battery bank – As with any inverter, it should be

located as close to the batteries as possible. Long DC wires tend to lose efﬁ ciency and reduce the overall performance of an inverter.

However, the unit should not be installed in the same compartment as the batteries or mounted where it will be exposed to gases produced by the batteries. These gases are corrosive and will damage the inverter. Also, if these gases are not ventilated and allowed to collect, they could ignite and cause an explosion.

Accessible –

Do not block access to the inverter’s remote control and accessory ports. Also, allow enough room to access the AC and DC wiring connections, as they will need to be checked and tightened periodically. See Figure 9 & 10 for the MMS inverter’s dimensions.

Mounting Orientation – To meet regulatory requirements, the MMS

Series inverter/charger can only be mounted

on a horizontal surface (shelf or table) or a vertical surface (wall or bulkhead) either rightside up or upside-down, as shown in Figure 8. The inverter must be mounted on a non-combustible surface, and this surface and the mounting hardware must be capable of supporting at least twice the weight of the inverter. After determining your mounting position, use the base of the inverter’s chassis as a template to mark your mounting screw locations. Remove the inverter and drill pilot holes into the mounting surface.

If this unit is used in a mobile application, you may want to place ﬂ exible washers or bushings between the mounting surface and the inverter’s mounting ﬂ anges to reduce vibration.

Installation

Mounting holes x4

[¼” (0.25") diameter]

10.0"

~ 16 " (16.59")

~ 6 " (6.71")

~ 8 " (8.41")

~ 7 " (7.51")

~ 4 "

(4.625")

1 2

5 8

Shelf Mounted

(right-side up)

Shelf Mounted

(up-side down)

Wall Mounted (up-side down)

Wall Mounted (right-side up)

Figure 8, Approved MMS1012 (-G) Mounting Orientations

Figure 9, MMS1012 Model Inverter/Charger Dimensions

Installation

Mounting holes x4

[¼” (0.25") diameter]

10"

~ 16 "

(16.59")

~ 4 "

(4.625")

~ 6 " (6.71")

~ 7 " (7.51")

~ 8 " (8.41")

~ 5"

~ 5 "

(5.125")

Figure 10, MMS1012-G Model Inverter/Charger Dimensions

2.1.3 Wiring Guidelines

• Before connecting any wires, determine all wire routes to and

from the inverter throughout the RV, vehicle, or boat.

• Conductors passing through walls or other structural members

must be protected to minimize insulation damage such as chaﬁ ng, which can be caused by vibration or constant rubbing.

• Always check for existing electrical, plumbing, or other areas of

potential damage prior to cutting into structural surfaces or walls.

• Make sure all wires have a smooth bend radius and do not be-

come kinked.

• Both AC and DC overcurrent protection must be provided as part

of the installation.

• Do not attempt to use a vehicle metal frame in place of the nega-

tive connection or DC ground. The inverter requires a reliable negative and ground return path directly to the battery.

Installation

• DC wires and cables should be tied together with wire ties or electrical tape approximately every 6 inches (15.2 cm). This helps improve the surge capability and reduces the effects of inductance, which improves the inverter waveform and reduces wear on the inverter’s ﬁ lter capacitors.

• Use only copper wires with a minimum temperature rating of 75°C (167°F).

• To ensure maximum performance from the inverter, all connections from the battery bank to the inverter should be minimized (Exception: the DC overcurrent disconnect in the positive line).

2.2 DC Wiring

This section describes the MMS Series inverter’s required DC wire sizes, the recommended disconnect/overcurrent protection, and how to make the DC connections to the inverter and the battery bank.

2.2.1 DC Wire Sizing

It is important to use the correct DC wire to achieve maximum efﬁ ciency from the system and to reduce ﬁ re hazards associated with overheating. Use Table 1 to select the minimum DC wire size needed based on your inverter model. If the distance from the inverter to the battery bank is greater than 3 feet (91.4 cm), use Table 2 to help determine the minimum recommended cable sizes for longer distances. Always keep your wire runs as short as practical to help prevent low voltage shutdowns and to keep the DC breaker from nuisance tripping (or open fuses) because of increased current draw. Undersized cables can also lower the inverter’s peak output voltage, as well as reduce its ability to surge heavy loads.

Info: The DC wires must be color coded with colored

tape or heat shrink tubing; RED for positive (+), BLACK for negative (-), and GREEN for DC ground.

The DC wires must have soldered and crimped lugs, crimped copper compression lugs, or aluminum mechanical lugs. Soldered connections alone are not acceptable for this application.

If the inverter is expected to operate at a distance greater than 3 feet (91.4 cm) from the battery bank, the DC wire size will need to be increased to overcome the increase in resistance—which affects the performance of the inverter. Continue to use the overcurrent device and DC ground wire previously determined from Table 1 and then, refer to Table 2 to determine the minimum DC wire size you need for various distances based on your inverter model.

2.2.2 DC Overcurrent Protection

For safety and to comply with NEC (National Electrical Code) electrical code regulations, you must install a DC overcurrent protection device in the positive DC cable line to protect your DC cables. This DC overcurrent device can be a fuse or circuit-breaker, but must be DC

Installation

rated. It must be correctly sized according to the size of DC cables being used, which means it is required to open before the cable reaches its maximum current carrying capability, thereby preventing a ﬁ re.

See Table 1 to select the DC overcurrent device based on the

minimum wire size for your inverter model.

Table 1, Recommended DC Wire/Overcurrent Device

Inverter Model

MMS1012 MMS1012-G

Maximum Continuous

Current¹

DC Grounding

Electrode Wire Size²

Minimum DC Wire Size³ (75˚C rating in free air)

Maximum DC Fuse Size

Note¹ – Maximum Continuous Current is based on the inverter’s continuous power rating at the lowest input voltage with an inefﬁ ciency factor. Note² – Per the NEC, the DC grounding electrode conductor can be a #6 AWG conductor if that is the only connection to the grounding electrode and that grounding electrode is a pipe, rod, or plate electrode. Note³ – Wire size is based on the requirements needed to increase efﬁ ciency and reduce stress to the inverter. Note – The next larger standard size overcurrent device may be used if the de-rated cable ampacity falls between the standard overcurrent devices found in the NEC.

133 amps 133 amps

#6 AWG

(13.3 mm²)

#2 AWG (33.6 mm²) [170 amps]

150 amps with

time delay

#6 AWG

(13.3 mm²)

#2 AWG

(33.6 mm²)

[170 amps]

150 amps with

time delay

Info: The term “in free air” is deﬁ ned by the NEC as not

encased in conduit or raceway.

Table 2, DC Wire Size For Increased Distance

Minimum recommended DC wire size (one way)

5 ft or less

(≤1.5 m)

MMS1012

MMS1012-G

#2 AWG

(33.6 mm²)

#2 AWG

(33.6 mm²)

5 to 10 ft

(1.5 m - 3.0 m)

#2 AWG

(33.6 mm²)

#2 AWG

(33.6 mm²)

10 to 15 ft

(3.0 m - 4.6 m)

#1 AWG

(42.4 mm²)

#1 AWG

(42.4 mm²)

Installation

Electrical systems in mobile installations typically do not require using a DC disconnect, although an overcurrent protection device is still required. Because the DC disconnect is not required, a fuse is usually used as the disconnect device in these installations. These installations also do not normally use conduit, so the fuse must be installed in the ungrounded conductor (usually the positive DC cable line) within 18 inches (45.7 cm) of the battery—to protect the DC wiring system.

If using a fuse, we recommend using a

This fuse type is rated for DC operation, can

circuit currents, and

allows for momentary current surges from the

class-T type or equivalent.

handle the high short-

inverter without opening.

2.2.3 DC Grounding

The inverter/charger should always be connected to a permanent, grounded wiring system.

The idea is to connect the metallic chassis of the various enclosures together to have them at the same voltage potential, which reduces the possibility for electric shock.

For the majority of installations, the inverter chassis and the negative battery conductor are connected to the system’s ground bond via a safetygrounding conductor (bare wire or green insulated wire) at only one point in the system. Per the NEC, the size for the grounding conductor is usually based on the size of the overcurrent device used in the DC system.

Refer to Table 1 to select the appropriate DC ground wire

based on the overcurrent device used for your inverter model. If the inverter is in a vehicle, DO NOT connect the battery negative

(-) cable to the vehicle’s safety ground. Only connect to the inverter’s negative battery terminal. If there are any non-factory installed appliances onboard the vehicle, DO NOT ground them at safety ground. Only ground them at the negative bus of the DC load center (as applicable).

2.2.4 DC Cable Connections

When connecting the DC cable to the battery or to the inverter’s DC terminals, the hardware should be installed in the correct order to prevent high resistance connections from heating up and possibly causing the connections to melt. Follow Figures 11 and 12 to stack the hardware correctly. Tighten the terminal connections from 10 to 12 ft-lbs.

CAUTION: Don’t put anything between the DC cable ring

lug and the battery terminal post or the inverter’s DC terminal. If antioxidant grease or spray is used, apply it after all the connections have been made and are properly tightened.

CAUTION: Overtightening or misthreading nuts on the DC

terminals will cause the bolts to strip and snap/break-off.

Installation

BATTERY

DC cable

with ring lug

bolt

flat washer

Nut

(½” wrench)

lock washer

battery

post

battery terminal

Temperature sensor

Verify that the DC cable lugs are flush with the battery terminals. Torque the battery terminals from 10 to 12 ft-lbs.

DC cable

with ring lug

terminal cover

(snaps on)

Inverter’s

DC terminal

5/16" (Kep nut with star-washer)

or Flange nut

Figure 11, DC Cable to Battery Terminals

CAUTION: The inverter is NOT reverse polarity protected

(negative and positive connected backwards). You must verify the correct voltage polarity BEFORE connecting the DC wires or damage may occur.

Crimped and sealed copper ring terminal lugs with a 5/16” hole should be used to connect the DC wires to the inverter’s DC terminals.

Figure 12, DC Cable to Inverter’s DC Terminals

Installation

2.3 Battery Bank Wiring

WARNING: Lethal currents will be present if the positive

and negative cables attached to the battery bank touch each other. During the installation and wiring process, ensure the cable ends are insulated or covered to prevent touching/shorting the cables.

Info: DO NOT connect the DC wires from the battery

bank to the inverter until: 1) all DC/AC wiring is complete,

2) the correct DC and AC overcurrent protections have been installed, and 3) the correct DC voltage and polarity have been veriﬁ ed.

Info: For optimum performance, a minimum battery bank

of 200 AHr is recommended.

Depending upon the type of batteries you use in the installation (6 or 12 VDC), the batteries must be wired in series, parallel, or

series-parallel (see Appendix B – Battery Information for guidance

on wiring batteries together). The interconnecting DC wires must be sized and rated exactly the same as those that are used between the battery bank and the inverter.

Place the batteries as close as practical to the inverter, preferably in an insulated and ventilated enclosure. Allow adequate space above the batteries to access the terminals and vent caps (as applicable). Also, allow at least 1” (2.5 cm) of space between the batteries to provide good air ﬂ ow. DO NOT mount the batteries directly under the inverter.

Info: To ensure the best performance from your inverter

system, do not use old or untested batteries. Batteries should be of the same size, type, rating, and age.

CAUTION: Install batteries in a well ventilated area. Bat-

teries can produce explosive gasses. For compartment or enclosure installations, always vent batteries to the outside.

2.3.1 Inverter to Battery Bank Wiring

WARNING: Ensure all sources of DC power (i.e., batter-

ies) and AC power (shorepower or AC generator) are deenergized (i.e., breakers opened, fuses removed) before proceeding.

Installation

CAUTION: The inverter is NOT reverse polarity protected.

If this happens, the inverter will be damaged and will not be covered under warranty.

from the batteries to the inverter, verify the correct battery voltage and polarity using a voltmeter. If the positive terminal of the battery is connected to the negative terminal of the inverter and vice versa, severe damage will result. If necessary, color code the cables with colored tape or heat shrink tubing; RED for positive (+), and BLACK for negative (-) to avoid polarity confusion.

Info: The DC overcurrent device (i.e., fuse or circuit

breaker) must be placed in the positive (RED) DC cable line between the inverter’s positive DC terminal and the battery’s positive terminal (RED); as close to the battery as possible.

DC Ground Wire

Route an appropriately sized DC grounding wire (GREEN or bare wire) from the inverter’s DC Ground Terminal (see Figure 3, Item

11) to a dedicated system ground. Recommended tightening torque is 45 in-lbs.

Before connecting the DC wires

DC Negative Wire

Route an appropriately sized DC negative wire (BLACK) from the negative terminal of the last battery string to the inverter’s negative terminal (see Figure 21 for reference).

Battery Temperature Sensor

Connect the RJ11 connector end of the BTS to the ACCESSORY PORT (see Figure 4, Item 15) on the inverter. Connect the other end of the BTS to the negative terminal of the ﬁ rst battery string (in same place as the DC negative wire above); refer to Figure 11 for the correct hardware placement.

DC Positive Wire

Mount the DC fuse block and disconnect (or circuit breaker assembly) as near as practical to the batteries, and then open the disconnect (or circuit breaker).

WARNING: DO NOT close the DC fuse/DC disconnect (or

close the DC circuit breaker) to enable battery power to

the inverter at this time. This will occur in the Functional Test after the installation is complete.

Route and connect an appropriately sized DC positive wire (RED) from the DC fuse block (or circuit breaker assembly) to the inverter’s positive DC terminal.

Connect a wire (same rating as the DC wires) to one end of the fuse block and the other end of this wire to the positive terminal of the ﬁ rst battery string (see Figure 21). This is essential to ensure even charging and discharging across the entire battery bank.

Installation

Ensure the DC wire connections (to batteries, inverter, and fuse lugs/ DC circuit breaker) are ﬂ ush on the surface of the DC terminals, and the hardware (lock washer and nut) used to hold these connections are stacked correctly (see Figures 11 and 12).

Verify all DC connections are torqued from 10 to 12 ft-lbs. Once the DC connections are completely wired and tested, coat the

terminals with an approved anti-oxidizing spray. Press the red and black terminal covers onto the inverter’s DC con-

nectors to secure them in place. If batteries are in an enclosure, perform a ﬁ nal check of the hold down

brackets and all connections. Close and secure the battery enclosure.

2.4 AC Wiring

This section describes the MMS Series’ required AC wire size and overcurrent protection. It also provides information on how to make the AC connections.

Info: The MMS1012-G model has a power cord for AC

input and dual outlets on top of the inverter for AC output (has hardwiring capability as well).

WARNING: All wiring should be done by a qualiﬁ ed per-

son or a licensed electrician following all local/NEC codes.

2.4.1 Neutral to Safety Ground Bonding

The NEC/CEC (National Electric Code/Canadian Electrical Code) provide the standards for safely wiring mobile (RV, boat, or truck) installations. These wiring standards require the AC source (inverter, shorepower, or a generator) to have the neutral conductor tied to ground. These standards also require that the AC neutral be connected to safety ground (often called a “bond”) in only one place at any time.

If more than one bond is established, currents can circulate between neutral and ground and cause ground-loop currents. These “ground-loops” can trip GFCIs and cause an electric shock hazard.

In mobile installations, there may be multiple AC sources (i.e., shorepower, generator, or inverter), which means there may be the potential of having multiple neutral-to-ground connections.

2.4.2 AC Wiring Connections

For the MMS1012 model, the AC input and output wiring is performed in the AC wiring compartment. This compartment is accessed via the top panel (Figure 3, Item 8). If the panel cover is installed, remove the two Phillips screws on the cover to access the AC wiring compartment and locate the inverter’s AC wiring. There is a label located in the AC access compartment which gives information on which wires are used for AC input and output. You can also refer to Table 3 to match the inverter’s AC wires to the appropriate AC wire connection.

Installation

Table 3, Wire Color to AC Wire Connection

Wire Color (label) Wire Connection

AC IN

Black (HOT IN) Hot In

White (NEUT IN) Neutral In

Red (HOT OUT) Hot Out

AC OUT

White with black

stripe (NEUT OUT)

Neutral Out

AC Ground Green (GROUND) AC IN & AC OUT Ground

The AC wires inside the AC compartment are #16 AWG (1.3 mm²) with a temperature rating of 105°C (221°F). All AC connections should be made using an approved connector for your application (e.g., split bolt, twist-on wire connectors, etc.). Ensure the wire connectors used are rated for the size and number of wires you are connecting.

After connecting the wires together, gently pull on the wires to ensure they are securely held together. In a proper connection, no bare wire should be exposed

Info: Per UL certiﬁ cation, non-metallic sheathed cable (i.e., Romex™) or an SO ﬂ exible cord with listed strain

reliefs are allowed to be used to connect to the inverter; conduit connections are not allowed.

After all AC wiring in the inverter is complete (and before reattaching the AC access cover), ensure all the connections are correct and secure.

2.4.3 AC Wire Size and Overcurrent Protection

The AC input and output wiring must be sized per NEC and local electrical safety code requirements

handle the inverter’s

maximum load current. After determining the

to ensure the wire’s ability to safely

proper AC wire sizes, the inverter’s AC input (unless you are using a ﬂ exible cord) and output wires are required to be protected against overcurrent and have a means to disconnect the AC circuits.

All inverter AC input and output wiring is required to be protected by an overcurrent protection device. Overcurrent protection must be provided by fuses or circuit-breakers, and must

be properly sized and rated for the wire they are protecting and the appliances being powered.

Most inverter’s that are hardwired use a service/distribution panel wired to the inverter’s input (main panel), and a dedicated panel between the inverter’s output wiring and the AC loads (sub-panel). These systems use the circuit breakers provided in the panels as the overcurrent protection and the AC disconnect. If fuses are used, then separate AC disconnect switches will be needed.

Installation

Based on information from the NEC, Table 4 provides the minimum AC wire size and the suggested breaker size based on inverter model. H

owever, a larger wire size may be required because of voltage drop.

The

AC wire sizes provided in this table assume using only copper wire and a temperature rating of 75°C (167°F) or higher. A minimum of #14 AWG

Table 4, Minimum Wire Size to Circuit-breaker Size

Inverter

Model

(2.1 mm²) is required for all AC wiring.

AC Input AC Output

Input

Breaker

Minimum

Wire

Size

Suggested

Breaker

Size

Output

Breaker

Minimum

Wire

Size

Suggested

Breaker

Size

MMS1012

-G

20 amps

#12 AWG

(3.3 mm²)

#12 AWG

(3.3 mm²)

20 amps 15 amps

#14 AWG

(2.1 mm²)

#14 AWG

(2.1 mm²)

15 amps

2.4.4 AC Input Wiring

Your inverter has an AC transfer feature that passes the AC input power to the inverter’s output. Connection to the AC input is made by hardwiring from a distribution panel as described below:

1. Run an appropriately sized 2-conductor plus ground cable (from

the AC distribution panel) through the strain relief clamp on the AC IN opening (Figure 3, Item 10). Refer to Table 4 for minimum wire size and overcurrent protection required for the AC input wiring.

2. Remove about two inches of the insulating jacket from the AC

cable, and then separate the three wires and strip about 3/4” (1.9 cm) of insulation from each wire.

3. Using approved AC wire connectors, connect the incoming Hot

In, Neutral In, and Ground wires to the MMS Series’ AC wires colored black (HOT IN), white (NEUT IN), and green (AC GROUND) respectively.

4. After making the AC input connections, secure the AC input cable

by tightening the strain relief clamp.

The AC input wiring in the inverter is complete. Review all AC wiring to ensure all connections are correct and secure.

Installation

AC IN

AC OUT

Strain reliefs

Ground

In/Out

(green)

Neutral

(white)

Hot Out

(red)

Neutral Out

(white w/black

stripe)

Hot

(black)

Figure 13, AC Wiring Connections (MMS1012 model)

Hot

(black)

Neutral

(white)

Ground

(green)

AC IN

Strain reliefs

AC OUT

Out

w/black stripe)

Ground

Out

Hot Out

(red)

(white

(green)

Figure 14, AC Hardwiring Connections (MMS1012-G model)

Info: The MMS1012-G model has a power cord for AC

input and a factory-installed dual outlet on top of the inverter for AC output.

Installation

2.4.5 AC Output Wiring

CAUTION: The inverter’s AC output must never be con-

nected to an AC power source. This will cause severe damage to the inverter and is not covered under warranty.

Info: When using the MMS Series inverter in an RV appli-

cation, under certain conditions and provided that the wire is properly sized for the protecting breaker; RVIA wiring standards will permit the breaker in the Main distribution panel and/or the supplemental breakers on the inverter to provide adequate protection for the AC output wiring. For more information on these requirements, refer to the RVIA (www.rvia.org).

Follow the steps below to hardwire the AC output of the MMS Series inverter:

1. Remove the 1/2” knockout on the AC Output Connection

(Figure 3, Item 9)—use a utility knife to cut thru the round slot.

2. Discard this knockout and install a 1/2” strain relief in the AC OUT

opening. You may need to ﬁ le the opening edge for proper ﬁ t.

3. Run a 2-conductor plus ground cable through the strain relief in

the AC OUT opening. Refer to Table 4 for the minimum wire size and the overcurrent protection required for the AC output wiring.

4. Remove about two inches (5.1 cm) of the insulating jacket from

the AC cable, and then separate the three wires and strip about 3/4” (1.9 cm) of insulation from each wire.

5. Using approved AC wire connectors, connect the outgoing Hot

Out, Neutral Out, and AC Ground wires to the inverter’s AC wires colored red (HOT OUT), white with black stripe (NEUT OUT), and green (AC GROUND) respectively. Gently pull on the wires to ensure they are securely held together, and check to see that no bare wire is exposed.

6. After making the AC output connections, secure the AC output

cable by tightening the strain relief.

7. Connect the outgoing AC wires to either:

a) an AC load sub-panel equipped with overcurrent protection (e.g., circuit breakers), or

b) directly to the circuit (if following RVIA requirements that permit using breakers from the main distribution panel or the breakers on the inverter under certain conditions).

The AC output wiring in the inverter should be complete. Before reattaching the AC access cover, review all AC wiring to ensure all connections are correct and secure.

Installation

Ground-Fault Circuit Interruption (GFCI) Breakers

In compliance with UL standards, Magnum Energy tested the following GFCIs and found that they function properly when connected to the inverter’s AC output:

Shock Sentry

Lock #8899-A, and Hubbel #GF520EMBKA.

WARNING: Risk of electric shock. Use only the GFCIs [receptacles or circuit breaker(s)] speciﬁ ed in this

manual. Other types may fail to operate properly when connected to this inverter.

CAUTION: Ground Fault Circuit Interrupters (GFCIs) shall

be installed in the recreational vehicle’s wiring system to protect all branch circuits.

Inverter Warning Label

The warning label (see Figure 15) is provided to inform all personnel that an inverter is installed in your electrical system. Afﬁ x this label in a clearly visible location at the electrical panel that is being powered by the inverter. This is necessary because it might be falsely assumed that the panel is no longer “hot” after AC power has been shut off—when in fact power may actually still be available due to the inverter automatically powering the panel.

#XGF15V-SP, Leviton Smart

This electrical system is equipped with an Automatic Generator Starting (AGS) device and/ or an inverter. Disconnect all AC and DC power to the AGS and/or inverter before performing any service to the electrical system. Failure to do so can result in shock causing serious injury or death.

PN: 62-0002 Rev A

Figure 15, Warning Label

2.5 Functional Test

After all electrical connections to the inverter, batteries, AC source

and loads (using a sub-panel)

steps to test the installation and the inverter’s operation.

1. Check the battery voltage and polarity before connecting the batteries to the inverter. Use a multimeter to verify 10 to 14 VDC at the batteries’ positive and negative terminals.

2. Apply battery power to the inverter by switching the DC disconnect ON (or close the DC circuit-breaker). The inverter will remain OFF, but the green status indicator on the front of the inverter will quickly blink once to indicate that DC power has been connected and is ready to be turned on.

have been completed, follow these

Installation

3. Prior to turning on the inverter, make sure all connected loads (e.g., appliances) are switched OFF or disconnected from the AC outlets.

4. a) If a remote switch is connected, press the ON/OFF switch to turn the inverter on.

b) If there is no remote switch connected, lightly press and release the inverter’s ON/OFF power switch—located on the top of the inverter—to turn the inverter on.

Verify the inverter’s status indicator is blinking—indicating the inverter is providing AC power.

5. Connect a 10-25 watt light bulb to the inverter output and verify it comes on and shines normally. DO NOT connect anything larger than a 25-watt light bulb until all wiring and voltages are conﬁ rmed to be correct.

Info: The inverter’s AC output voltage will not be correct

until a load greater than 5 watts (default setting) is connected to the inverter; or, Search mode is turned off with a remote display (ME-RC, ME-ARC, or ME-RTR). A 10-25 watt bulb is used as it is a sufﬁ cient load to bring the inverter out of Search mode and up to full voltage.

6. Check the AC output voltage of the inverter by connecting a true RMS multimeter to the outlets powered by the inverter. Verify the voltage is 120 VAC +/- 5 VAC. If not using a true RMS meter, the output AC voltage could indicate from 90 to 130 VAC depending on the battery voltage.

7. Press the remote ON/OFF switch to turn the inverter off. If the remote is not used, press and release the inverter’s ON/OFF power switch to turn the inverter off. The inverter’s status indicator and the connected load should go off.

8. Apply AC power to the inverter’s AC input. After the AC input power is qualiﬁ ed (approximately 15 seconds), the incoming AC power will transfer through the inverter to the inverter’s AC output and power the connected light bulb. Verify that the inverter’s status indicator and the connected light bulb come on.

9. Even though the connected light bulb is on, the inverter is currently disabled/off. Press the remote’s ON/OFF switch (or press and release the ON/OFF power switch on the inverter) to enable/ turn on the inverter.

10. Disconnect the incoming AC power to the inverter. Verify the light bulb remains on, but now is powered by the inverter.

If the inverter passes all the steps, the inverter is ready for use. If the inverter fails any of the steps, refer to the Troubleshooting section.

Operation

3.0 Operation

3.1 Operating Modes

The MMS Series inverter/charger has two normal operating routines. Inverter mode, which powers the loads using the batteries, and Standby mode, which transfers the incoming AC power (i.e., shorepower or a generator) to power the loads and to recharge the batteries. This inverter also includes an extensive protection circuitry that shuts down the inverter under certain fault conditions.

3.1.1 Inverter Mode

When the inverter is ﬁ rst powered up, it defaults to the OFF mode.

The momentary ON/OFF power switch (Figure 3, Item 2) must be lightly pressed to turn the inverter ON. Subsequently pressing this switch alternately turns the inverter OFF and ON.

• Inverter OFF – When the inverter is OFF, no power is used

from the batteries to power the AC loads and be OFF. If AC power from an external source (shorepower or generator) is connected and qualiﬁ ed on the inverter’s AC input, this AC input power will pass through the inverter to power the AC loads. However, if this AC power is lost, the AC loads will no longer be powered because the inverter is OFF.

the status LED will

When the inverter is turned ON, it operates either by “Searching” or “Inverting”, depending on the connected AC loads.

• Searching – When the inverter is ﬁ rst turned ON, the automatic

Search feature is enabled. This feature is provided to conserve battery power when AC power is not required. In this mode, the inverter pulses the AC output looking for an AC load (i.e., electrical appliance). Whenever an AC load (greater than 5 watts) is turned on, the inverter recognizes the need for power and automatically starts inverting. When there is no load (or less than 5 watts) detected, the inverter automatically goes back into Search mode to minimize energy consumption from the battery bank. When the inverter is “Searching”, the inverter’s green LED ﬂ ashes.

Info: The factory default value for the Search feature is 5

watts. It can be turned off or adjusted from 5 to 50 watts using the ME-RC50 remote display.

• Inverting –

the inverter output, the MMS Series “inverts” the DC power from the battery and supplies 120 VAC power to your sub-panel. The

inverter’s green LED ﬂ ashes once every 2 seconds to indicate it is inverting. The providing power is directly related to the amount of AC loads that are connected and the capacity of the battery bank.

When a load greater than 5 watts is connected to

amount of time the inverter can be inverting and

Operation

3.1.2 Standby Mode

The MMS Series features an automatic transfer relay and an internal battery charger when operating in Standby mode. Standby mode begins whenever AC power (shorepower or generator) is connected to the inverter’s AC input. Once the AC voltage and frequency of the incoming AC power is within the AC input limits, an automatic AC transfer relay is activated. This transfer relay passes the incoming AC power through the inverter to power the AC loads on the inverter’s output. This incoming power is also used to activate a powerful internal battery charger to keep the battery bank charged in case of a power failure.

Battery charging

– The MMS Series models are equipped with an

active Power Factor Corrected (PFC) multi-stage battery charger. The PFC feature is used to control the amount of power used to charge the batteries in order to obtain a power factor as close as possible to 1 (or unity). This causes the battery charger to look like a resistor to the line (forces the charge current waveshape to mirror the voltage waveshape). This feature maximizes the real power available from the AC power source (shorepower or generator), which translates into less power wasted and a greater charging capability than most chargers available today.

When an AC power source is connected to an inverter that has a battery charger, the inverter monitors the AC input for acceptable voltage. Once the inverter has accepted the AC input, the AC transfer relay will close and charging will begin. Once charging, the DC voltage is monitored to determine the charging stage. If the DC voltage is low (≤12.9 VDC), the charger begins bulk charging. If the DC voltage is high (>12.9 VDC), the charger skips the initial Bulk/Absorb Charging stages and goes directly to ﬂ oat charging.

The multi-stage charger can use up to ﬁ ve different charging stages to help monitor and keep the batteries healthy.

The ﬁ ve stages

include an automatic 4-stage charging process (Bulk, Absorb, Float, and Full Charge), and a manual Equalization (EQ) charge stage. The

automatic 4-stage charge process provides complete recharging and monitoring of the batteries without damage due to overcharging (see Figure 16). The Equalization stage (requires the ME-RC50 remote)

is used to stir up stratiﬁ ed electrolyte and reverse any battery plate sulfation that might have occurred.

While charging, the unit may go into Charger Back-off protection

which automatically reduces the charge current to the batteries. This is caused by:

1. The internal temperature is too hot – the charger automatically reduces the charge rate to maintain temperature; or,

2. The AC input voltage falls < 85 VAC – the charger reduces the charge current to zero to help stabilize the incoming AC voltage; or

3. FET temperature.

Operation

The automatic 4-stage charging process includes:

• Bulk Charging: This is the initial stage of charging. While bulk

charging, the charger supplies the battery with constant current. The charger remains in bulk charge until the absorption charge voltage is achieved (14.6 VDC)* —as determined by the Battery Type selection**.

• Absorb Charging: This is the second charging stage and begins

after the bulk voltage has been reached. Absorb charging provides the batteries with a constant voltage and reduces the DC charging current in order to maintain the absorb voltage setting. The absorb charging time is 120 minutes—as determined by the Battery AmpHrs selection**.

• Float Charging: The third charging stage occurs at the end of

the absorb charging time. While ﬂ oat charging (also known as a maintenance charge), the batteries are kept fully charged and ready if needed by the inverter. The Float Charging stage reduces battery gassing, minimizes watering requirements (for ﬂ ooded batteries), and ensures the batteries are maintained at optimum capacity. In this stage, the charge voltage is reduced to the ﬂ oat charge voltage (13.4 VDC)* —as determined by the Battery Type selection** — which can maintain the batteries indeﬁ nitely.

• Full Charge (Battery Saver™ mode): The fourth stage occurs

after four hours of ﬂ oat charging. The Full Charge stage maintains the batteries without overcharging, preventing excessive loss of water in ﬂ ooded batteries or drying out of GEL/AGM batteries. In this stage, the charger is turned off and begins monitoring the battery voltage. If the battery voltage drops low (≤12.7 VDC), the charger will automatically initiate another four hours in ﬂ oat charge.

* These voltage settings are based on the Battery Temperature Sensor (BTS) being disconnected, or at a temperature of 77°F (25°C). If the BTS is installed, these voltage settings will increase if the temperature around the BTS is below 77°F (25°C), and decrease if the temperature around the BTS is higher than 77°F (25°C).

** The MMS Series uses changeable settings (see Table 6, Inverter Default Settings) that are adequate for most installations. However, if you determine that some of your operating parameters need to be changed, the ME-RC50 remote control can be purchased to allow changes to those settings.

Constant

Current

Reduced

Current

Reduced

Voltage

Absorb volts

‘Adj

Charge

Rate’

Setting

Increased

Voltage

Constant

Voltage

Monitored

Voltage

No Current

Time

Float volts

Monitored

Current

Absorb Time

Bulk

Charging

Absorb

Charging

Float

Charging

Voltage

Current

Full

Charge

Goes to Full

Charge after 4

hours in Float

Charge

Absorb and Float voltage settings are

determined by the ‘Battery Type’ selection

(per the ‘Adj Batt AmpHrs’ setting)

Operation

Figure 16, Automatic 4-Stage Charging Graph

Transfer time – While in Standby mode, the AC input is continually

monitored. Whenever AC power falls below the VAC dropout voltage (80 VAC, default setting), the inverter automatically transfers back to Inverter mode with minimum interruption to your appliances—as long as the inverter is turned on. The transfer from Standby mode to Inverter mode averages approximately 16 milliseconds. While the MMS Series is not designed as a computer UPS system, this transfer time is usually fast enough to hold them up. However, the VAC dropout setting has an effect on the ability of the loads to transfer without resetting. The lower this setting, the longer the effective transfer will be and therefore, the higher the probability for the output loads to reset. This occurs because the incoming AC voltage is allowed to fall to a level that is so low that when the transfer does occur, the voltage on the inverter’s output has already fallen to a low enough level to reset the loads.

The disadvantage of a higher VAC dropout setting is that smaller generators (or large generators with an unstable output) may nuisance transfer. This commonly happens when powering loads that are larger than the generator can handle—causing the generator’s output voltage to constantly fall below the inverter’s input VAC dropout threshold.

Info: You must use the ME-RC50 or ME-ARC50 remote to

adjust the VAC dropout setting—which in turn determines the VAC dropout threshold.

Info: When switching from Inverter mode to Standby

mode, the inverter waits approximately 15 seconds to ensure the AC source is stable before transferring.

Operation

3.2 Battery Temperature Sensor Operation

The plug-in Battery Temperature Sensor (BTS) is used to determine the battery temperature around the batteries. This information allows the multi-stage battery charger to automatically adjust the battery charge voltages for optimum charging performance and longer battery life.

When the BTS is installed, if the temperature around the BTS is below 77°F (25°C) the absorb and ﬂ oat charge voltage increases. If the temperature around the BTS is higher than 77°F (25°C), the absorb and ﬂ oat charge voltage decreases. See Figure 17 much the charge voltage changes (increases or decreases) as the temperature reading of the BTS changes. For example, the nominal absorb charge voltage for a ﬂ ooded battery at 77°F (25°C) is 14.6 VDC. If the battery temperature is 95°F (35°C), the absorb charge voltage would decrease to 14.3 VDC (14.6 VDC - 0.3 change).

If the temperature sensor is NOT installed, the charge voltages will not be compensated and the battery will maintain the charge it had at a temperature of 77°F (25°C). The life of the batteries may be reduced if they are subjected to large temperature changes when the BTS is not installed.

to determine how

Info: When the BTS is connected, the battery charger

uses a value of -5mV/°C/Cell from 0-50°C to change the charge voltage based on temperature.

Temperature Compensation using BTS

12VDC units

+0.75V

+0.6V

+0.45V

+0.3V

+0.15V

No Change

-0.15V

-0.3V

-0.45V

-0.6V

-0.75V 0C

32F5C41F

10C 50F

15C 59F

20C 68F

Change to battery charging voltage

Temperature reading from BTS

25C 77F

30C 86F

no BTS

connected

40C

35C

104F

95F

45C

113F

50C

122F

Figure 17, BTS Temperature to Charge Voltage Change

Operation

3.3 Protection Circuitry Operation

The inverter is protected against fault conditions, and in normal usage it will be rare to see any. However, if a condition occurs that is outside the inverter’s normal operating parameters, then it will shut down and attempt to protect itself, the battery bank, and your AC loads. If there is a condition that causes the inverter to shut down, it may be one of the conditions listed below. Refer also to the Troubleshooting section to diagnose and clear the fault.

• Low Battery – The inverter will shut off whenever the battery

voltage falls to the Low Battery Cut Out (LBCO) level to protect the batteries from being over-discharged. After the inverter has reached the LBCO level and turned off, the inverter will automatically restart after one of the following conditions:

1. AC power is applied and the inverter begins operating as a battery charger.

2. Battery voltage rises to the Low Battery Cut In (LBCI) level.

The inverter’s status LED turns off when a low battery fault condition occurs. Refer to Table 5 to determine the LBCO and LBCI levels for your particular inverter model.

• High Battery – In the event the battery voltage approaches the High Battery Cut Out (HBCO) level, the inverter will automatically

shut down to prevent the inverter from supplying unregulated AC output voltage. The inverter’s status LED turns off when a high battery fault condition occurs. The inverter will automatically

restart when the battery falls to the High Battery Cut In (HBCI)

level. Refer to Table 5 to determine the HBCO and HBCI levels for your particular inverter model.

Info: High battery voltage may be caused by excessive or

unregulated voltage from solar panels or other external charging sources.

• Overload – During Inverter and Standby operation modes, the

inverter monitors the DC and AC current levels. In the event of a short-circuit or an overload condition for more than a few seconds, the inverter will shut down. To start operating after this fault, the inverter would need to be restarted (turned back on) after the inverter’s AC loads are reduced/removed.

• Over-temperature – If internal power components begin to

exceed their safe operating temperature level, the inverter will shut down to protect itself from damage. The inverter’s status LED turns OFF to indicate the over-temperature fault condition. The inverter will automatically restart after the units cools down.

Operation

• Internal Fault – The inverter continually monitors several inter-

nal components and the processor communications. If a condition occurs that doesn’t allow proper internal operation, the inverter will shut down to protect itself and the connected loads. The inverter will need to be reset to start operating.

Table 5, Inverter Battery Turn On/Off Levels

Inverter Battery

Inverter Model

Turn On/Off

Levels

MMS1012 MMS1012-G

HBCO >15.8 VDC >15.8 VDC

HBCI 15.5 VDC 15.5 VDC

LBCI ≥12.5 VDC ≥12.5 VDC

LBCO

(one minute

delay)

LBCO

(immediate)

10.0 VDC

(9.0 - 12.2 VDC)

8.5 VDC 8.5 VDC

10.0 VDC

3.4 Inverter Startup

ON/OFF Switch – The inverter can be turned on and off by lightly

pressing and releasing the Power ON/OFF switch on the front of the inverter. When the inverter is ﬁ rst connected to the batteries, or when its automatic protection circuit has turned the inverter off, the ON/ OFF switch will need to be pressed to start the unit. Once the inverter has been turned on, pressing the Power ON/OFF switch alternately turns the inverter on and off.

WARNING: The Power ON/OFF control switch does not

turn on or off the charger feature. If AC power (utility or generator) is connected and qualiﬁ ed on the AC input, this AC power will also be available on the AC output and is not controlled by the Power ON/OFF switch.

Status LED Indicator – The status indicator is a green LED (Light

Emitting Diode) that provides information on the operational mode of the inverter. Watch this indicator for at least 10 seconds to determine the inverter’s operational condition from the information below:

Inverter Mode

Off – Indicates the inverter is off; there is no AC power from

the inverter, shorepower, or generator at the inverter’s output terminals.

Blinks On (once every second) – The inverter is on and is using

energy from the battery. The inverter is either providing full power to the loads connected to the inverter, or it’s in Search mode and ready to supply AC power to the connected loads.

Operation

Protection Mode

There are ﬁ ve fault conditions that will cause the inverter to shut down: Low Battery, High Battery, Over-temperature, AC Overload, and Internal faults. If your inverter has shut down, monitor the status indicator and count the number of blinks that occur every four seconds to determine the particular reason for the shutdown. Refer to the Troubleshooting section to help diagnose/clear the fault condition.

• Blinks on x1 every four seconds – Low Battery fault.

• Blinks on x2 every four seconds – High Battery fault.

• Blinks on x3 every four seconds – Over-temperature fault.

• Blinks on x4 every four seconds – AC Overload fault.

• Blinks on x5 every four seconds – Internal fault.

Charge Mode

The green LED status indicator provides additional information:

• Blinks off every four seconds – The unit is charging the batteries connected to the inverter. The external AC power (shorepower or generator) connected to the inverter’s input is passing through the inverter and is powering the AC loads connected to the inverter’s output.

3.5 Factory Default Settings

The MMS Series inverter/charger uses default settings that are adequate for most installations (see Table 6). However, you can adjust these parameters using Magnum’s optional ME-RC50 remote. The settings once programmed are saved in non-volatile memory and are preserved until changed—even if DC power to the inverter is lost (the ME-RC50 must always be connected). The following information can help you determine if you need the ME-RC50 remote*.

01 Search Watts: This setting allows you to turn off the power-

saving Search mode circuitry and to adjust the power level at which the inverter will “wake up” and start inverting.

02 Low Battery Cut Out: This setting determines when the inverter

will turn off based on low battery voltage. The inverter turns off automatically after the battery voltage has been below this setting for more than one minute. This protects the batteries from overdischarge and the AC loads from unregulated power (brown-outs).

03 Battery AmpHrs: This setting allows you to input the battery

bank size in amp hours. This provides information to the charger on how long to charge the batteries in the Absorb Charging stage.

* Visit www.magnumenergy.com for more information.

Operation

04 Battery Type: This setting identiﬁ es the type of batteries being

used in the system. This provides information to the charger to determine what voltage level to use to charge the batteries.

05 Charge Rate: T

his setting can be used to turn off the charger, or limit the amount of current that the charger can use (leaving more current available to power loads); or, to ensure small battery banks are not overheated because of a charge rate that is too high.

06 VAC Dropout: Sets the minimum AC voltage that must be pres-

ent on the AC input before the unit transfers from Standby mode to Inverter mode. This protects the AC loads from utility outages and brown-outs.

The ME-RC50 remote also provides the following features:

• allows you to enable an equalize charge for certain battery types

• displays the inverter/charger’s operating status

• displays fault information for troubleshooting

Table 6, Inverter/Charger Default Settings

Function Default Settings

Search Watts 5W

LowBatCutOut 10.0 VDC

Battery AmpHrs 400 AmpHrs

(Absorb Time = 90 minutes)

Battery Type Flooded - Liquid Lead Acid

(Bulk = 14.6 VDC, Float =

13.4 VDC)

Charge Rate 100%

VAC dropout 80VAC

Maintenance and Troubleshooting

4.0 Maintenance and Troubleshooting

4.1 Recommended Inverter and Battery Care

The MMS Series inverter/charger is designed to provide you with years of trouble-free service. Even though there are no user-serviceable parts, it is recommended that every 6 months you perform the following maintenance steps to ensure optimum performance and extend the life of your batteries.

WARNING: Prior to performing these checks, switch both

the AC and DC circuits OFF.

• Visually inspect the batteries for cracks, leaks, or swelling – replace if necessary.

• Use baking soda to clean and remove any electrolyte spills or

buildups.

• Check and tighten all battery hold-down clamps.

• Clean and tighten (10 to 12 ft-lbs) all DC terminals

(battery and inverter) and connecting cables.

• Check/ﬁ ll battery water levels (liquid lead acid batteries only).

• Check individual battery voltages (replace those that vary

more than 0.3 VDC from each other).

• Check all cable runs for signs of chaﬁ ng – replace if necessary.

• Check the inverter’s cooling vents – clean as necessary.

4.2 RV/Marine Off-Season Storage

When placing your coach or boat into seasonal storage, it is recommended that you perform the following to ensure the system is properly shut down (or properly conﬁ gured for seasonal storage). This is especially important for maintaining the batteries.

• Perform the recommended maintenance steps noted above.

• Fully charge the batteries.

• Connect shorepower (if available) and verify that the breaker to the battery charger is switched ON.

• Verify the inverter is switched OFF.

• Switch OFF all unnecessary AC and DC loads.

Maintenance and Troubleshooting

4.3 Resetting the Inverter

Under some fault conditions (i.e., an internal fault), the inverter will need to be reset.

To reset the inverter:

1. Press and hold the Power ON/OFF pushbutton for approximately

15 seconds, or until the Status LED comes on and ﬂ ashes (see Figure 18).

2. Release the Power ON/OFF pushbutton once the ﬂ ashing has

begun. The Status LED will go off.

3. Press the Power ON/OFF pushbutton again to turn the inverter on.

Info: The Power ON/OFF pushbutton is a small momentary

type switch which is operated by lightly pressing and releasing.

Status LED

Indicator

Power ON/OFF

pushbutton

Figure 18, Resetting the Inverter

Maintenance and Troubleshooting

4.4 Troubleshooting

The MMS Series inverter/charger is a fairly simple device to troubleshoot. There are only two active circuits (AC and DC), as well as a charging circuit. The following chart is designed to help you quickly pinpoint the most common inverter and charger faults.

Table 7, Troubleshooting Guide

Symptom Possible Cause Recommended Solution

Low Battery Voltage (the status indicator blinks x1 every 4 secs)

The battery voltage level has dropped below the Low Battery Cut Out (LBCO) set-point for more than one minute (10.0 VDC = LBCO default setting).

Battery voltage is too low. Check fuses/ circuit-breakers and cable connections. Check battery voltage at the inverter's terminals. Your batteries may need to be charged, this fault condition will automatically clear when the battery voltage exceeds 12.5 VDC.

High Battery Voltage (the status indicator blinks x2 every 4 secs)

Over-temperature condition (the status indicator blinks x3 every 4 secs)

AC Overload (the status indicator blinks x4 every 4 secs)

Internal fault (the status indicator blinks x5 every 4 secs)

Inverter's status light is off.

AC input won't connect (AC IN on remote blinks)

Appliances turn off and on; or there is low AC output power.

Inverter AC output voltage is too low or too high when using an AC voltmeter.

While charging, the DC charge voltage is higher or lower than expected.

The battery voltage is above 15.5 VDC. The inverter automatically resets and resumes operation when the battery voltage drops below 15.5 VDC.

The internal temperature of the inverter has risen above acceptable limits; caused by loads too great for the inverter to operate continuously, or by lack of ventilation to the inverter. When the unit has cooled, it will automatically reset and resume operation.

The inverter has turned off because the connected loads are larger than the inverters output capacity or the output wires are shorted.

This fault occurs when an internal fault is detected.

Inverter is switched OFF or there is no DC voltage (battery) connected to inverter.

The incoming AC voltage will not be accepted if it is below the VAC Dropout setting (80VAC = VAC Dropout default setting).

Loose AC output connections. Tighten AC output connections.

Loose / corroded battery cables. Clean and tighten all cables.

Low batteries. Recharge or replace batteries.

Wrong type of voltmeter used (will display 90 VAC to 130 VAC depending on the battery voltage).

If the Battery Temperature Sensor is installed, it will increase or decrease the DC voltage level depending on temperature around the battery sensor.

This condition usually occurs only when an additional charging source (alternator, solar panels or other external charging sources) is used to charge the battery bank. Reduce or turn off any other charger to the inverter batteries to allow the voltage level to drop.

Reduce the number of electrical loads that you are operating, this will avoid a repeat Over-temp shutdown if the cause was too many loads for the ambient conditions.

Check ventilation around the inverter, ensure cool air is available to pass-thru the inverter.

Reduce the AC loads connected to the inverter or remove all AC output wiring and restart the inverter.

To clear this fault, an inverter reset is required. Remove DC power to the inverter or press and hold down the power switch on the inverter for 15 seconds (until the green Status LED comes on). If this fault does not clear, the unit will need to be serviced.

Switch the inverter ON. Connect a battery with correct voltage to the inverter.

Check the incoming AC voltage to the input of the inverter, ensure it is present and above the VAC dropout level.

Most meters are made to read Average AC voltage. The AC output of the MM is a

ed" waveform which requires using

"modiﬁ a “true” RMS voltmeter to correctly read the output voltage.

This is normal.

Speciﬁ cations

5.0 Speciﬁ cations

Table 8, MMS Series Speciﬁ cations

MODEL MMS1012 MMS1012-G

Inverter Speciﬁ cations

Input battery voltage 9 to 17 VDC Nominal AC output voltage 120 VAC +/- 5% Output frequency and accuracy 60 Hz +/- 0.1 Hz 1msec surge current 38 AAC 100msec surge current 21 AAC 5 sec surge power (real watts) 1750 30 sec surge power (real watts) 1600 5 min surge power (real watts) 1200 30 min surge power (real watts) 1050 Continuous power output at 25° C 1000 VA Max. continuous input current 133 ADC Inverter efﬁ ciency (peak) 0.87 Transfer time 16 msecs AC transfer capability 15A Search mode (typical) 5 watts No load (120 VAC output, typical) 19 watts Waveform Pure Sine Wave

Charger Speciﬁ cations

Continuous output at 25° C 50 ADC Charger efﬁ ciency 84% Power factor > 0.95 Input current at rated output 7 AAC Battery temp compensation Yes, 15 ft Battery Temp Sensor standard

General Features and Capabilities

Protection circuitry Low/High Battery, Over-temp & Overload Corrosion protection PCB’s conformal coated, powder coated chassis AC Output Hardwire GFCI outlet AC Input Hardwire 3 ft cord Output circuit breaker 15A Input circuit breaker 20 AAC Internal cooling Yes, 0 to 59 cfm variable speed

Optional remotes available MM-RC or ME-RC50

UL listing

Environmental Speciﬁ cations

Operating temperature -20°C to +60°C (-4°F to 140°F) Non-operating temperature -40°C to +70°C (-40°F to 158°F) Operating humidity 0 to 95% RH non-condensing

Physical Speciﬁ cations

Dimensions (L x W x H) 16.6”x 8.4”x 4.7” (42cm x 21cm x 12cm) Mounting Shelf or wall (no vents facing downward) Weight 23 lbs. (10.4 kg) Shipping weight 25 lbs. (11.3 kg)

Speciﬁ cations @ 25° C - Subject to change without notice

ETL listed to UL/cUL458, CSA C22.2 #107.1,

meets KKK-A-1822E std.

Appendix A – Optional Equipment and Accessories

A-1 Optional Equipment and Accessories

The following Magnum Energy components are available for use with the MMS Series inverter/charger. Some of these items are required depending upon the intended use of the inverter.

Smart Battery Combiner

The Smart Battery Combiner (ME-SBC charge a second battery using a portion of the current that is charging the main battery. The ME-SBC eliminates a signiﬁ cant voltage drop, and provides automatic turn-on and turn-off based on adjustable voltage set-points. This allows different batteries to be charged from a single charging source, and prevents overcharging/undercharging.

Basic Remote Control

The ME-RC50 Remote Control panel is simple to use; an LCD screen and “at a glance” LEDs display complete inverter/charger status. Soft keys provide simple access to menus and a rotary encoder knob allows you to scroll through and select a wide range of settings.

Auto Generator Start Controller

The ME-AGS-N Automatic Generator Start controller (Network version) is designed to automatically start your generator based on low battery condition or high temperature. It works

volt battery banks and includes a 4-position DIP (Dual In-line Package) switch which provides the ability to change the relay timing conﬁ gurations to allow compatibility with a wider range of generators.

) is designed to monitor and

with 12, 24, and 48

Battery Monitor Kit

The ME-BMK Battery Monitor Kit is a single battery bank amp-hour meter

that monitors the condition of the battery and provides information to let you know how much energy you have available and to plan your electrical usage to ensure the battery is not being overdischarged. The ME-BMK-NS version does not include

a DC shunt—

order the ME-BMK to receive a 500A/50mv DC shunt.

Fuse Block/Fuses

The Magnum Fuse/Fuse-blocks are used to protect the battery bank, inverter, and cables from damage caused by DC short circuits and overloads. They include a slow-blow fuse with mounting block and protective cover. The 125 and 200-amp models use an ANL type fuse and the 300 and 400-amp models use a Class-T fuse.

DC Load Disconnect

The MM-DCLD (DC Load Disconnect) pigtail adapter is designed to provide a means to DISABLE the inverter function when a 12-volt DC signal is removed.

Ignition Switch Activate

The MM-ISA (Ignition Switch Activate) is a pigtail adapter is designed to automatically ENABLE the inverter function when a 12-volt DC signal is supplied.

6 volts

(200 AHrs)

6 volts

(200 AHrs)

overcurrent protection

12 volt battery bank (total capacity = 200 AHrs)

12 VDC

Inverter

Appendix B – Battery Information

B-1 Battery Information

Battery Bank Sizing

The size of the battery bank determines how long the inverter can power the AC loads without recharging. The larger the battery bank, the longer the run time. Size your battery bank to the system’s AC load requirements and the length of time required to run the load from the batteries. In general, the battery bank should not be discharged more than 50%.

Battery Types

Batteries are available in different sizes, amp-hour ratings, voltage, and chemistries; they also come in liquid or gel, vented or nonvented, etc. They are also available for starting applications (such as an automobile starting battery) and deep discharge applications. Only the deep cycle types are recommended for inverter applications. Choose the batteries best suited for the inverter installation and cost. Use only the same battery type for all batteries in the bank. For best performance, all batteries should be from the same lot and date. This information is usually printed on a label located on the battery.

Battery Conﬁ guration

The battery bank must be wired to match the inverter’s DC input voltage speciﬁ cations. In addition, the batteries can be wired to provide additional run time. The various wiring conﬁ gurations are:

Series Wiring

bank output voltage. A series connection combines each battery in a string until the voltage matches the inverter’s DC requirement. Even though there are multiple batteries, the capacity remains the same. In the example below (Figure 19), two 6 VDC/200 AHr batteries are combined into a single string—resulting in a 12 VDC/200 AHr bank.

– Wiring batteries in a series increases the total battery

Figure 19, Series Battery Wiring

Appendix B – Battery Information

overcurrent

protection

String 2

String 1

12 volt battery bank (total capacity = 400 AHrs)

12 VDC

Inverter

6 volts

(200 AHrs)

6 volts

(200 AHrs)

6 volts

(200 AHrs)

6 volts

(200 AHrs)

(First)

(Last)

12 volt battery bank (total capacity = 400 AHrs)

overcurrent

protection

12 volts

(100 AHrs)

12 volts

(100 AHrs)

12 volts

(100 AHrs)

12 volts

(100 AHrs)

12 VDC

Inverter

Parallel Wiring – Wiring the batteries in parallel increases the total

run time the batteries can operate the AC loads. A parallel connection combines overall battery capacity by the number of batteries in the string. Even though there are multiple batteries, the voltage remains the same. In the example below (Figure 20), four 12 VDC/100 AHr batteries are combined into a single 12 VDC/400 AHr battery bank.

Figure 20, Parallel Battery Wiring

Series-Parallel Wiring – A series-parallel conﬁ guration increases

both voltage (to match the inverter’s DC requirements) and capacity (to increase run time for operating the loads) using smaller, lowervoltage batteries. In the example below (Figure 21), four 6 VDC/200 AHr batteries are combined into two strings resulting in a 12 VDC/400 AHr battery bank.

Figure 21, Series-Parallel Battery Wiring

Appendix B – Battery Information

Examples for wiring a 12-volt battery bank:

String

(12 VDC @ 100 AH)

12-volt battery bank (one string of one 12-volt battery)

12 VDC battery

(100 AH)

overcurrent

protection

(

overcurrent

protection

to 12 VDC

inverter

total capacity

= 100 AH)

Series String

(6 VDC + 6 VDC)

12-volt battery bank (one string of two 6-volt batteries wired in series)

Parallel String

(100 AH + 100 AH)

12-volt battery bank (parallel two 12-volt batteries)

Parallel String (200 AH + 200 AH)

6 VDC

battery

(200 AH

)

12 VDC battery

(100 AH)

6 VDC

battery

(200 AH)

12 VDC battery

(100 AH)

to 12 VDC

inverter

(total capacity

= 200 AH)

overcurrent

protection

to 12 VDC

inverter

(total capacity

= 200 AH)

overcurrent

protection

Series String

(6 VDC + 6 VDC)

Series String

(6 VDC + 6 VDC)

12-volt battery bank (two strings of two 6-volt batteries wired in series and

6 VDC

battery

(200 AH)

6 VDC

battery

(200 AH)

connected in parallel)

6 VDC

battery

(200 AH)

6 VDC

battery

(200 AH)

to 12 VDC

inverter

(total capacity

= 400 AH)

Figure 22, Battery Bank Wiring Examples (12-volt)

Appendix C – Warranty/Service Information

C-1 Warranty/Service Information

C-1.1 Limited Warranty

Magnum Energy, Inc., warrants this MMS Series inverter/charger to be free from defects in material and workmanship that result in product failure during normal usage, according to the following terms and conditions:

1. The limited warranty for the product extends for 24 months beginning from the product’s original date of purchase.

2. This warranty extends to the original purchaser of the product and is not assignable or transferable to any subsequent purchaser.

3. During the limited warranty period, Magnum will repair or replace (with factory new or remanufactured replacement items) at Magnum’s option any defective parts, or any parts that will not properly operate for their intended use—if such repair or replacement is needed because of product malfunction or failure during normal usage. The limited warranty does not cover defects in appearance (cosmetic or decorative), or any structural or non-operative parts. Magnum’s limit of liability under the limited warranty shall be the actual cash value of the product at the time the original purchaser returns the product for repair, determined by the price paid by the original purchaser. Magnum shall not be liable for any other losses or damages.

4. Upon request from Magnum, the original purchaser must prove the product’s original date of purchase by a dated bill of sale, itemized receipt.

5. The original purchaser shall return the product prepaid to Magnum Energy in Everett, WA. After the completion of service under this limited warranty, Magnum will return the product prepaid to the original purchaser via a Magnum selected non-expedited surface freight within the contiguous United States and Canada; this excludes Alaska and Hawaii.

6. If Magnum repairs or replaces a product, its warranty continues for the remaining portion of the original warranty period or 90 days from the date of the return shipment to the original purchaser, whichever is greater. All replaced products and parts removed from repaired products become the property of Magnum Energy.

7. This limited warranty is voided if:

• the product has been modiﬁ ed without authorization

• the serial number has been altered or removed

• the product has been damaged through abuse, neglect accident, high voltage, or corrosion

• the product was not installed and operated according to the owner’s manual

OBTAIN A RETURN MATERIAL AUTHORIZATION (RMA) NUMBER

BEFORE RETURNING ANY UNIT

Appendix C – Warranty/Service Information

C-1.2 How to Receive Repair Service

If your product requires warranty service or repair, contact either:

• An authorized service center, as listed on the Magnum’s website

http://www.magnumenergy.com/ServiceCenters.htm, or

• Magnum Energy, Inc. at:

Telephone: 425-353-8833 Fax: 425-353-8390 Email:

If returning your product directly to Magnum Energy for repair, you must:

1. Return the unit in the original, or equivalent, shipping container

2. Receive a Return Materials Authorization (RMA) number from

the factory prior to the return of the product to Magnum Energy for repair.

3. Place RMA numbers clearly on the shipping container or on the

packing slip.

warranty@magnumenergy.com

When sending your product for service, please ensure it is properly

packaged. Damage due to inadequate packaging is not covered under warranty. We recommend sending the product by traceable

or insured service.

Web: www.magnumenergy.com

PN: 64-0036 Rev B

Magnum Energy, Inc.

2211 West Casino Rd.

Everett, WA 98204

Phone: 425-353-8833

Fax: 425-353-8390

Magnum Energy MMS S User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

1.0 Introduction

1.1 MMS Series Models

1.2 How an Inverter/Charger Works

1.4 Appliances and Run Time

1.5.1 Battery Temperature Sensor

2.0 Installation

2.1 Pre-Installation

2.1.1 Unpacking and Inspection

2.1.2 Locating and Mounting the Inverter

2.1.3 Wiring Guidelines

2.2 DC Wiring

2.2.1 DC Wire Sizing

2.2.2 DC Overcurrent Protection

2.2.3 DC Grounding

2.2.4 DC Cable Connections

2.3 Battery Bank Wiring

2.3.1 Inverter to Battery Bank Wiring

2.4 AC Wiring

2.4.1 Neutral to Safety Ground Bonding

2.4.2 AC Wiring Connections

2.4.3 AC Wire Size and Overcurrent Protection

2.4.4 AC Input Wiring

2.4.5 AC Output Wiring

2.5 Functional Test

3.0 Operation

3.1 Operating Modes

3.1.1 Inverter Mode

3.1.2 Standby Mode

3.2 Battery Temperature Sensor Operation

3.3 Protection Circuitry Operation

3.4 Inverter Startup

3.5 Factory Default Settings

4.0 Maintenance and Troubleshooting

4.1 Recommended Inverter and Battery Care

4.2 RV/Marine Off-Season Storage

4.3 Resetting the Inverter

4.4 Troubleshooting

A-1 Optional Equipment and Accessories

B-1 Battery Information

C-1 Warranty/Service Information

C-1.1 Limited Warranty

C-1.2 How to Receive Repair Service