Mastervolt SCM20 PWM, SCM40 PWM Installation Manual

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SOLAR CHARGE MASTER
SCM20 PWM / SCM40 PWM
PWM CONTROLLED PV BATTERY CHARGER
10000014327/02
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EN / SCM20 & SCM40 PWM User’s Manual
OVERVIEW
1. MENU button
2. OK button
3. LCD-display
4. Casing
5. Heatsink
6. PV input
7. Battery connection
8. Load output
9. Temperature sensor jack
10. Identification label (rear side)
Figure 1: Overview
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2
3
5
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TABLE OF CONTENTS:
1 GENERAL INFORMATION .............................................................................................................................................. 4
1.1 Use of this manual .............................................................................................................................................. 4
1.2 Validity of this manual ......................................................................................................................................... 4
1.3 Use of pictograms ............................................................................................................................................... 4
1.4 Identification label ............................................................................................................................................... 4
1.5 Liability ............................................................................................................................................................... 4
2 OPERATION .................................................................................................................................................................... 5
2.1 General ............................................................................................................................................................... 5
2.2 Maintenance ....................................................................................................................................................... 5
2.3 Three step charge algorithm ............................................................................................................................... 5
2.4 LCD Display ....................................................................................................................................................... 6
2.5 Monitoring ........................................................................................................................................................... 6
2.6 Configuration ...................................................................................................................................................... 7
2.6.1 Low voltage disconnect function ........................................................................................................ 8
2.6.2 Battery type ....................................................................................................................................... 8
2.6.3 Load mode ......................................................................................................................................... 8
3 INSTALLATION ............................................................................................................................................................... 9
3.1 Unpacking .......................................................................................................................................................... 9
3.2 Environment ....................................................................................................................................................... 9
3.3 Wiring and fuses ................................................................................................................................................. 9
3.4 Specifications of the PV array .......................................................................................................................... 10
3.5 Connection of loads .......................................................................................................................................... 10
3.5.1 Load connected to the Load output ................................................................................................. 10
3.5.2 Load connected to the battery ......................................................................................................... 10
3.6 Things you need ............................................................................................................................................... 10
3.7 Connection ....................................................................................................................................................... 12
3.7.1 General ............................................................................................................................................ 12
3.7.2 Installation step by step ................................................................................................................... 12
3.8 Commissioning after installation ....................................................................................................................... 13
3.9 Decommissioning ............................................................................................................................................. 13
3.10 Storage and transportation ............................................................................................................................... 13
3.11 Re-installation ................................................................................................................................................... 13
3.12 Correct disposal of this product ........................................................................................................................ 13
4 TROUBLE SHOOTING .................................................................................................................................................. 14
5 TECHNICAL DATA ........................................................................................................................................................ 15
5.1 Specifications ................................................................................................................................................... 15
5.2 Dimensions ....................................................................................................................................................... 16
5.3 Ordering information ......................................................................................................................................... 16
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1 GENERAL INFORMATION
1.1 USE OF THIS MANUAL
This manual serves as a guideline for the safe and effective operation, maintenance and possible correction of minor malfunctions of the “Solar ChargeMaster” It is therefore obligatory that every person who works on or with the Solar ChargeMaster must be completely familiar with the contents of this manual and the Important Safety Instructions, and that he/she carefully follows the instructions contained herein. Installation of, and work on the Solar ChargeMaster may be carried out only by qualified, authorised and trained personnel, consistent with the locally applicable standards and taking into consideration the Important Safety Instructions.
Copyright © 2018 Mastervolt. All rights reserved. Reproduction, transfer, distribution or storage of part or all of the contents in this document in any form without the prior written permission of Mastervolt is prohibited.
1.2 VALIDITY OF THIS MANUAL
All of the specifications, provisions and instructions contained in this manual apply solely to standard versions of the Solar ChargeMaster delivered by Mastervolt. This manual is only valid for the following models:
Part number Model
131822000 ChargeMaster “SCM20 PWM” 131822000 ChargeMaster “SCM40 PWM”
These models are mentioned as “Solar ChargeMaster” further in this manual.
1.3 USE OF PICTOGRAMS
Safety instructions and warnings are marked in this manual and on the product by the following pictograms:
A procedure, circumstance, etc which deserves extra attention.
CAUTION!
Special information, commands and prohibitions in order to prevent damage.
WARNING
A WARNING refers to possible injury to the user or installer or significant material damage to the Soladin if the installer / user does not (carefully) follow the stated procedures.
Read this manual before installation and use
This product has been declared conform the EC directives and standards.
Degree of protection: IP23. The product is protected against touch by fingers and water spray < 60 degrees from vertical.
1.4 IDENTIFICATION LABEL
Figure 2: Identification label
The identification label is located at the rear side of the Solar ChargeMaster (see Figure 2). Important technical information required for service, maintenance & secondary delivery of parts can be derived from the identification label.
CAUTION!
Never remove the identification label.
1.5 LIABILITY
Mastervolt can accept no liability for: consequential damage due to use of the Solar
ChargeMaster;
possible errors in the manuals and their results.
Part no: 131824000 Type: SCM40 PWM PV-input: 36cells, 28Vmax, 4 @ 12Vbat 72cells, 55Vmax, 4 @ 24Vbat Output: 14.25 / 28.5VDC, 40A
0Amax 0Amax
Snijdersbergweg 93, 1105AN Amsterdam, The Netherlands
IP23
Designed by Mastervolt
Manufactured in PRC
Serial no: J821A0001
Serial number
J821A0001
Apparatus version “A”
Part number
IP23
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2 OPERATION
2.1 GENERAL
The Mastervolt Solar ChargeMaster is a fully automatic battery charger which converts power from photovoltaic (PV) array to a regulated battery voltage. The Solar ChargeMaster will automatically adjust itself to a 12V or a 24V system. Under normal circumstances the Solar ChargeMaster remains switched on with the PV-array and batteries connected.
If power from the PV array is sufficient, the Solar Chargemaster will initiate the charging process.
WARNING
The Solar Chargemaster has no on/off switch. Charging will be initiated as soon as power from the PV-array becomes available.
The Load output of the Solar Chargemaster switches off if one of the following fault conditions occurs: overload, short circuit, overheating or under and over voltage. The Load output switches on again after one minute if the Solar Chargemaster recovers from these fault conditions.
CAUTION!
The Solar ChargeMaster is not protected against:
Excessive overvoltage on the Solar input  Surges inducted by lightning.
2.2 MAINTENANCE
No specific maintenance to the Solar Chargemaster is required. Examine your electrical installation on a regular base, at least once a year. Defects such as loose connections, burnt wiring etc. must be corrected immediately. If necessary, use a soft clean cloth to clean the casing of the Solar Chargemaster. Do not use any liquids or corrosive substances, such as solvents, alcohol, petrol or abrasive components.
In the event of decommissioning, refer to section
3.9
2.3 THREE STEP CHARGE ALGORITHM
See Figure 3. Battery charging is accomplished in three automatic stages: BULK, ABSORPTION and FLOAT.
Figure 3: Three step charge system
BULK: At this stage the charger delivers its maximum
current for quick charging from 0 to 80%
ABSORPTION: The charger has reached its maximum
charge voltage and the charge current will slowly decrease until the battery is charged up to 100%.
FLOAT: This stage begins once the battery is fully
charged. The battery remains in fully charged state.
By installing the battery temperature sensor (not included; see section 5.3 for ordering information) the charge voltages are automatically adapted for deviating temperatures.
Figure 4: Temperature compensated charging
See Figure 4. When the battery temperature is low, the charge voltage increases. On the other hand, when the battery temperature is high, the charge voltage is decreased. Over charge and gassing are prevented this way. This will extend the life of your batteries
12V
24V
battery temperature (°C)
charge voltage (V)
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2.4 LCD DISPLAY
Use the MENU and OK button (Figure 1, items 1 and 2) to operate the Solar Chargemaster
Explanation of the symbols used on the screen:
Item Indication Meaning
PV Array
Daytime, not charging
Daytime, charging
Night
PV voltage, current and Ah’s Total Charged Ah from the PV-array
Battery
Battery capacity
Battery voltage (programmable) Battery current
Battery state of charge (in %) Temperature
Battery tyoe (programmable)
Load
Load voltage, current and Ah (24hrs cycle) The total discharge Af of the load Load mode (programmable) Load is off
Load is on
Fault
Fault condition, see section 4
2.5 MONITORING
There are three monitoring modes: Automatic Scrolling Mode: the LCD-display is
automatically scrolling through a selection of screens.
Manual Scrolling Mode; Press OK shortly to scroll
through all screens manually.
Static Display Mode: Hold MENU and OK pressed
simultaneously for 1 second to lock the screen. Hold MENU end OK pressed simultaneously for 1 second again to return to the Automatic Scrolling Mode.
Below table shows the available screens.
(#) = not shown in Automatic Scrolling Mode (!) = not relevant if the load is directly connected to the battery; see section 3.5.
= you can enter the configuration mode from
this screen; see section 2.6.
Screen Meaning
Voltage at the PV input.
Current of the PV array.
(#) Charged Ah.
(#)Total Charged Ah from the PV-array.
Battery voltage
See section 2.6 for configuration of the Low voltage disconnect function.
(!) Battery current. Positive = charging. Negative = discharging.
(!) State of charge (available energy in %) of the battery.
Temperature of the battery in °C. Only shown if battery temperature sensor is connected.
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Screen Meaning
(#) Battery type.
See section 2.6 to change
the Battery type settings
(!) Voltage at the Load output.
(!) Load current.
(#)(!) Discharged Ah from the battery.
(#)(!)Total discharged Ah from the battery.
(#)(!) Status of the load mode.
See section 2.6 for explanation and configuration of the Load mode settings
2.6 CONFIGURATION
CAUTION!
Invalid settings of the Solar ChargeMaster can cause serious damage to your batteries and/or the connected load! Adjustments of settings may be undertaken by authorised personnel only.
If your Solar Chargemaster is not new, you have to take into account that former users may have changed the settings.
When the symbol is shown on the screen (see section
2.5), you can enter the Configuration mode:
Hold MENU pressed for 1 sec. until the symbol starts
blinking
Change a setting:
Shortly press OK until the desired setting is shown
Save setting and exit the configuration mode:
Press MENU shortly
Exit the Configuration mode without saving setting:
Wait for 30 seconds.
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2.6.1 Low voltage disconnect function
There are two ways to protect the battery from too deep discharges: Static: the Load output switches off if the battery
voltage drops below the Disconnect threshold voltage.
Dynamic: the Load output switches off depending on
both battery voltage and load current.
The Load output switches on again if the battery voltage rises above the Reconnect threshold value.
The Low voltage disconnect function can only be used if the load is connected to the Load output (see section 3.5)
Static Low voltage disconnect function:
Indication Disconnect
threshold
Reconnect threshold
10.8 / 21.6 10.8V / 21.6V 11.6 V / 23.2V
10.9 / 21.8 10.9V / 21.8V 11.7 V / 23.4V
11.0 / 22.0 11.0V / 22.0V 11.8 V / 23.6V
11.1 / 22.2 11.1V / 22.2V 11.9 V / 23.8V
11.2 / 22.4 11.2V / 22.4V 12.0 V / 24.0V
11.3 / 22.6 11.3V / 22.6V 12.1 V / 24.2V
11.4 / 22.8 11.4V / 22.8V 12.2 V / 24.4V
11.5 / 23.0 11.5V / 23.0V 12.3 V / 24.6V
11.6 / 23.2 11.6V / 23.2V 12.4 V / 24.8V
11.7 / 23.4 11.7V / 23.4V 12.5 V / 25.0V
11.8 / 23.6 11.8V / 23.6V 12.6 V / 25.2V
Dynamic Low voltage disconnect function:
Indication Disconnect threshold Reconnect
threshold
at full load at no load
11.0V
22.0V
11.6V
23.2V
12.4 V
24.8V
11.1V
22.2V
11.6V
23.2V
12.5 V
25.0V
11.2V
22.4V
11.6V
23.2V
12.6 V
25.2V
11.4V
22.8V
11.6V
23.2V
12.7 V
25.4V
11.6V
23.2V
11.6V
23.2V
12.8 V
25.6V
2.6.2 Battery type
Indication Battery type
Gel
Flooded (liquid)
AGM
2.6.3 Load mode
Indication Load mode
Always on Mode: the load output is always switched on Dusk to Dawn Mode: the load output is switched on between sunset and sunrise. PV input threshold voltage:
5.0/10.0V Evening Mode: The load output will be switched on for 2~9 hours after sunset. Manual Mode. The load output can be switched on and off manually by pressing MENU shortly.
NOTES:
You can test the operation of the Load output manually
by holding MENU pressed for 3 seconds. Press MENU again to switch off the load again or the load will switch off automatically after 1 minute.
If the Manual Load Mode is selected (“USE”), you can
switch on and off the Load output manually by pressing MENU shortly. In this case the protections against fault conditions for overload, short circuit, overheating or under and over voltage will be ignored!
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3 INSTALLATION
During installation commissioning and maintenance of the Solar ChargeMaster, the Important Safety Instructions are applicable at all times.
3.1 UNPACKING
The delivery includes the following items:
Solar Chargemaster; This User’s manual Important Safety Instructions
After unpacking, check the contents for possible damage. Do not use the product if it is damaged. If in doubt, contact your supplier.
3.2 ENVIRONMENT
Obey the following stipulations during installation: The Solar Chargemaster is designed for indoor use
only.
Ambient operating temperature: -20°C ... 50°C / -4°F …
122°F (power de-rating above 40°C / 104°F to decrease the internal temperature).
Humidity: 5-95%, non-condensing. The Solar ChargeMaster must be mounted to a vertical,
solid and heat-resistant surface, with the connecting cables downwards.
Do not expose the Solar Chargemaster to excessive
dust, aggressive environments, ammonia or salt.
Make sure that the hot air that is developed during
operation can be discharged. The Solar Chargemaster must be mounted in such a way that obstruction of the airflow along the heatsink on the backside of the casing will be prevented.
No objects must be located within a distance of 20 cm /
8 inch around the Solar Chargemaster.
Do not locate the Solar Chargemaster in the same
compartment as the batteries.
Do not install the Solar Chargemaster straight above
the batteries because of possible corrosive sulphur fumes.
Although the Solar Chargemaster fully complies with all
applicable EMC limits, it may still cause harmful interference to radio communication equipment. If such interference appears, it is recommended to increase the separation between the Solar Chargemaster and the equipment, to relocate the receiving antenna or to connect the equipment to a circuit different from that to which the Solar Chargemaster is connected.
3.3 WIRING AND FUSES
WARNING
The wire and fuse sizes stated in this manual are given as example only. Prescribed wire and fuse sizes may be different due to local applicable regulations and standards.
Keep in mind that high current will pass through the DC wiring. Keep the cable length as short as possible, this will keep the system efficiency as high as possible. The recommended minimum cross sections of the wiring are:
Model Minimum DC Cable cross section
<2m / 6ft length 2 - 4m / 6 - 12ft
SCM20 PWM 6mm² / 8AWG 10mm² / 6AWG SCM40 PWM 10mm² / 6AWG 16mm² / 4AWG
Use boot lace ferrules on the wire ends. These ferrules must be crimped with a proper crimping tool. Use the following wire colours for DC wiring:
Wire colour Meaning Connect to:
Red Positive + (POS) Black Negative – (NEG)
Lay the positive and negative cables next to each other to limit the electromagnetic field around the cables. The negative battery cable should be connected directly to the negative post of the battery bank or the ground side of a current shunt. Do not use the chassis frame as the negative conductor. Tighten securely. The positive battery cable must be fused and connected to the positive post of the battery bank.
The recommended DC fuses are:
Model Battery fuse Load fuse
SCM20 PWM 20A 20A SCM40 PWM 40A 40A
See section 5.3 for ordering information
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3.4 SPECIFICATIONS OF THE PV ARRAY
WARNING
When the PV array is exposed to light, it supplies a DC voltage to the Solar Chargemaster which can be dangerous to touch. For this reason, use of an external DC-switch is strongly recommended. Alternatively, before attempting any maintenance or cleaning the PV­array should be protected from light exposure, e.g. by covering the PV modules.
CAUTION!
Do not connect Solar Chargemasters in parallel on the side of the PV array.
The Solar ChargeMaster is appropriate for nominal 12V and 24V solar systems. The table shows the number of cells required for the nominal voltages.
Battery voltage U
NOM
= 12V
Model Panel type
Max input voltage
Max input current
SCM20 PWM 36 cells 28V 20A SCM40 PWM 36 cells 28V 40A
Battery voltage U
NOM
= 24V
Model Panel type
Max input voltage
Max input current
SCM20 PWM 72 cells 55V 20A SCM40 PWM 72 cells 55V 40A
CAUTION!
Never connect voltages higher than specified to the PV-input, as this will cause permanent damage to the Solar Chargemaster.
Configuration examples for PV-arrays consisting of monocrystalline or polycrystalline PV-modules:
3.5 CONNECTION OF LOADS
Depending on the energy system in which the Solar Chargemaster is used, there are two options to connect the electrical load to the Solar Chargemaster:
To the Load output on the Solar Chargemaster, or Directly to the battery.
3.5.1 Load connected to the Load output
See Figure 5 for a typical installation diagram. The Load output is provided with a protection circuit that switches off the connected load automatically in case of overload or if the battery voltage is too low. This kind of installation is typically used when the PV-modules are the only source of electrical power to charge the battery.
3.5.2 Load connected to the battery
If the maximum load will exceed 20 Amps (SCM20 PWM), 40 Amps (SCM40 PWM) or if the battery will also be charged by other energy sources, such as a battery charger or an alternator, the electrical load shall be connected to the battery directly. See Figure 6 for a typical installation diagram. In this situation the battery is no longer protected against too low battery voltages. Installation of additional undervoltage protection circuits may be necessary. See section 5.3 for ordering information
3.6 THINGS YOU NEED
Make sure you have all the parts you need to install the Solar Chargemaster:
Solar Chargemaster (included); Battery temperature sensor with cable and plug
(optional, not included; see section 5.3 for ordering information);
DC cables to connect the Solar Chargemaster; see
section 3.3 for specifications;
DC-fuse holder with a DC-fuse, to be integrated in the
positive DC-cable to the battery; see section 3.3;
Screws / bolts (Ø 4mm max.) (with plugs) to mount the
Solar Chargemaster to a surface;
Batteries; Appropriate and reliable cable terminals, strain reliefs,
battery terminals and boot lace ferrules.
We recommend as a minimum tool kit: Phillips screw driver nr.2 or flat blade screw driver 5
mm to fix the DC-cables;
Tools to fix the screws / bolts with plugs to mount the
Solar Chargemaster to a surface;
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Figure 5: Load connected to the Load output on the Solar Chargemaster
Figure 6: Load connected directly to the battery
Above schematics are to illustrate the general placement of the Solar Chargemaster in a circuit. They are not meant to provide detailed wiring instructions for any particular electrical installation
Battery temperature sensor
BATTERY
Load
Battery fuse
Load fuse
PV-array
External DC-switch
(see section 3.4)
Battery temperature sensor
BATTERY
Load
Battery fuse
Load fuse
PV-array
External DC-switch
(see section 3.4)
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3.7 CONNECTION
3.7.1 General
WARNING
Let installation work be done by a licensed electrician. All electrical systems must be disconnected from any power source during the entire installation!
CAUTION!
Short circuiting or reversing DC polarity
may lead to damage to the Solar Chargemaster, the cabling and/or the terminal connections.
Follow all steps of the installation
instructions in order of succession as described.
CAUTION!
Too-thin cables and/or loose connections can cause dangerous overheating of the cables and/or terminals. Therefore tighten all connections well, in order to limit transition resistance as far as possible. Use cables of the correct size. Use additional strain reliefs to prevent the transmission of stress to the screw connectors.
CAUTION!
The negative connections of the Solar ChargeMaster are common and therefore have the same electrical potential. If grounding is required, always do this on the negative wires. Use one grounding point only.
NOTE: If the battery temperature remains within 15­25°C, connection of the battery temperature sensor is optional
3.7.2 Installation step by step
1 Mark the position of the mounting spots. Then fix the
casing to the wall.
2 Fit boot lace ferrules to all DC-cables.
3 Integrate a fuse holder in the positive battery wire, but
do not place the fuse yet. Connect the wiring from the Battery connection to the battery.
4 Optional: Attach the battery temperature sensor to the
casing the battery. Plug the temperature sensor cable into the Temperature sensor jack.
WARNING
Risk of shock! When the PV array is exposed to light, it supplies a dangerous DC voltage. See section 3.4!
5 Connect the PV array.to the PV input.
6 Connect the wiring of the Load-output (see section
3.5). Integrate a fuse holder in the positive load wire, but do not place the fuse yet.
7 Check all wiring: positive to +, negative to –. See also
Figures 5 and 6 for wiring examples. If OK, continue with section 3.8 for commissioning of the Solar ChargeMaster.
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3.8 COMMISSIONING AFTER INSTALLATION
CAUTION!
Check the polarity of all wiring before commissioning: positive connected to positive (red cables), negative connected to negative (black cables).
1 If all wiring is OK, place the DC-fuse between the Solar
Chargemaster and the battery
WARNING
When placing this fuse, a spark can occur, caused by the capacitors used in the Solar Chargemaster. This is particularly dangerous in places with insufficient ventilation, due to the gassing of the batteries an explosion can occur. Avoid having flammable materials close by.
2 Then. place the DC-fuse between the Solar
Chargemaster and the load.
3 The Solar Chargemaster will initiate the charging
process if the voltage from the PV array is sufficient.
If the Solar Chargemaster does not switch on, press MENU shortly.
4 Refer to section 2.6 for settings.
3.9 DECOMMISSIONING
To put the Solar ChargeMaster out of operation, follow these instructions in order of succession:
1 Switch off all loads that are connected to the Solar
Chargemaster;
2 Disconnect the PV array by switching off the switch
between the PV-array and the Solar Chargemaster (or protect the PV-array from light exposure, e.g. by covering the PV modules);
3 Remove the DC-fuse between the Solar Chargemaster
and the battery;
4 Remove the DC-fuse between the Solar Chargemaster
and the load;
5 Check with a suitable voltage meter whether the
Battery connection and the LOAD output of the Solar Chargemaster are voltage free;
6 Disconnect the negative cable to the PV array from the
terminal block of the Solar Chargemaster. Isolate the core of the wire with insulating tape;
7 Do the same for the positive cable to the PV array;
8 Disconnect all other remaining wiring.
Now the Solar Chargemaster can be demounted in a safe way.
3.10 STORAGE AND TRANSPORTATION
When not installed, store the Solar Chargemaster in the original packing, in a dry and dust free environment.
Always use the original packing for transportation. Contact your local Mastervolt Service Centre for further details if you want to return the apparatus for repair.
3.11 RE-INSTALLATION
To reinstall the Solar Chargemaster, follow the instructions as described in this chapter (chapter 3).
3.12 CORRECT DISPOSAL OF THIS PRODUCT
(Waste Electrical & Electronic Equipment)
This product is designed and manufactured with high quality materials and components, which can be recycled and reused. When this crossed-out wheeled bin symbol is
attached to a product, it means the product is covered by the European Directive 2012/19/EU. Please be informed about the local separate collection system for electrical and electronic products. Please act according to your local rules and do not dispose of your old products with your normal household waste. The correct disposal of your old product will help prevent potential negative consequences to the environment and human health
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4 TROUBLE SHOOTING
If you cannot solve a problem with the aid of this chapter, contact your local Mastervolt Service Centre. See www.mastervolt.com/technical-support. Make sure you have the following information present if you have to contact your local Mastervolt Service Center to solve a problem: Article and serial number; see section 1.4
Malfunction Possible cause What to do?
No display function
Battery voltage is abnormal Check battery voltage. Battery voltage must be
10~15V for 12V systems or 20~30V for 24V systems.
Reversed polarity of the Battery Check wiring to battery No voltage at Load output
Fault condition See below error codes E1 ~E5
Wrong setting of the Load mode Check settings of the Load mode (section 2.6)
Short circuit at Load output Switch off all loads, remove short circuit. Load
output will automatically resume after 1 minute.
Overload at Load output Reduce the connected load. Load output will
automatically resume after 1 minute.
Battery voltage is too low; see section 2.6
for configuration of the Low voltage
disconnect function.
Reduce load connected to the batteries and charge batteries. Load output will automatically
resume after 1 minute. Overcharge, battery voltage is too high (>15.5/31.0V)
Check batteries. Check other charging systems.
Use the battery temperature sensor.
Over temperature Check cooling of the Solar Chargemaster
No battery charging during daytime
Batteries are full Nothing. No power from the PV-modules.. Check wiring to PV-modules. Check for loose
connections, short circuit or incorrect polarity Damaged battery temperature sensor Check battery temperature sensor (if applied)
Output voltage too low, charger supplies maximum current
Load that is connected to the batteries is larger than charger can supply.
Reduce load taken from the batteries.
Batteries not 100% charged Measure battery voltage. After some time this will
be higher. Wrong battery type setting Check settings (see section 2.6).
Battery is discharged too fast
Battery capacity reduced due to sulphation or due to plate corrosion
Charge and recharge a few times, this might help.
Check battery and replace if necessary. Too low charger capacity or battery capacity or too high load
Check balance between charger capacity, battery
capacity and load
Batteries are too warm, gassing
Defective battery (short circuit in cell) Check battery and replace if necessary. Battery temperature too high Use the battery temperature sensor. Charge current too high for battery Check specifications of battery for maximum
allowed charge current Wrong battery type setting Check settings (see section 2.6).
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5 TECHNICAL DATA
5.1 SPECIFICATIONS
Model SCM20 PWM SCM40 PWM
Article no.: 131822000 131824000 Nominal battery voltage (U
NOM
): 12V / 24 V (Auto recognition) 12V / 24 V (Auto recognition)
PV-INPUT @ U
NOM
= 12V @ U
NOM
= 24V @ U
NOM
= 12V @ U
NOM
= 24V
Typical number of cells: 36 cells 72 cells 36 cells 72 cells Absolute maximum PV Voltage: 28VDC 55VDC 28VDC 55VDC Maximum PV input current*: 20A 20A 40A 40A Control: PWM Dusk to dawn threshold voltage: 5V 10V 5V 10V
BATTERY OUTPUT @ U
NOM
= 12V @ U
NOM
= 24V @ U
NOM
= 12V @ U
NOM
= 24V
Maximum charge current (I
MA
X
): 20A 20A 40A 40A Charge voltage, Absorption: 14.4V 28.8V 14.4V 28.8V Charge voltage, Float (flooded): 13.25V 26.5V 13.25V 26.5V Charge voltage, Float (AGM / gel batteries): 13.8V 27.6V 13.8V 27.6V Battery temperature compensation: –30 mV/°C –60 mV/°C –30 mV/°C –60 mV/°C DC consumption (at night):
7mA 7mA 7mA 7mA
Battery voltage operating window:
10.0-15.0V 20.0-30.0V 10.0-15.0V 20.0-30.0V Charge algorithm: Three step (Bulk, Absorption, Float) Battery types*: Flooded, AGM, Gel
LOAD OUTPUT @ U
NOM
= 12V @ U
NOM
= 24V @ U
NOM
= 12V @ U
NOM
= 24V
Maximum output current: 20A 20A 40A 40A Under voltage disconnect (adjustable**): 10.8~11.8V 21.6~23.6V 10.8~11.8V 21.6~23.6V Under voltage reconnect (adjustable**): 11.6~12.6V 23.2~25.2V 11.6~12.6V 23.2~25.2V
GENERAL
Galvanic isolation between PV and battery: No, common negative conductor Dimensions in mm [inch] (h x w x d): 96 x 189 x 53 mm [3.8 x 7.4 x 2.0 inch]; see also section 5.2 Weight: 480g Operating Temperature Range: –20°C ≤ T
AMB
+50°C [–4°F T
AMB
122°F]
Full Power Temperature range: –20°C ≤ T
AMB
+40°C [–4°F T
AMB
104°F] (no power de-rating)
Non-operating Temperature range: –25°C ≤ T
AMB
+75°C [–13°F T
AMB
167°F] (storage temperature) Relative Humidity: 5% to 95% non-condensing Protections: Reversed polarity, output overload, output short circuit, overheating,
battery under voltage, battery over voltage Protection degree: IP23 MasterBus connectivity: No Load modes**: Always on, Dusk to Dawn, Evening, Manual Terminals: Screw terminals, max. wire size 16mm2 * Short circuit current of the PV module ** Refer to section 2.6 for configuration Specifications are subject to change without prior notice.
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EN / SCM20 & SCM40 PWM User’s Manual
5.2 DIMENSIONS
Figure 7: Dimensions of the Solar ChargeMaster in mm [inches]
5.3 ORDERING INFORMATION
Part number Description
77049020 ANL Fuse 20A 77049040 ANL Fuse 40A 607006 ANL Fuse block 701 Battery switch 275A 41500500 Battery temperature sensor, incl. 6 meter / 19 ft cable 83200150 Battery Watch, Battery undervoltage protection circuit, 12V/24V, 100A continuous, 150A peak load 77020200 DC-Distribution 500.
The Mastervolt DC Distribution offers fused DC connections to install up to four different devices.
Mastervolt can offer a wide range of products for your electrical installation, including battery chargers, DC to AC Sine wave inverters, AGM, gel and Li-ion batteries, DC distribution kits and many more. See our website www.mastervolt.com for an extensive overview of all our products
187.8 177
4
.7
0
0
17
47.5
78
81.5
95.4
51.6
MASTERVOLT, Snijdersbergweg 93, 1105 AN Amsterdam, The Netherlands, T: +31 (0)20 342 21 00, F: +31 (0)20 697 10 06, www.mastervolt.com
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