User Manual
EnerSolar 3K PV Inverter
Table Of Contents
1. Introduction ............................................................. 3
2. Important Safety Warning ......................................... 4
3. Unpacking & Overview .............................................. 6
4. Installation ............................................................... 6
5. Grid (AC) Connection ................................................ 8
6. PV Module (DC) Connection ...................................... 9
7. Commissioning ....................................................... 11
8. Operation ............................................................... 12
9. Maintenance & Cleaning .......................................... 17
10. Trouble Shooting .................................................... 18
11. Specifications ......................................................... 19
Distribution Box
Electric grids
PV module 2
EnerSolar PV inverter
PV module 1
1. Introduction
1-1. Overview
The EnerSolar inverter is designed to convert solar electric (photovoltaic or PV) power into
utility-grade electricity that can be sold to the local power company. This inverter is allowed for
2 arrays of PV modules. Embedded with two smart independent MPPTs, the EnerSolar PV
inverter can operate at optimum power output voltage.
Figure 1 Basic PV System Overview
This inverter is only compatible with PV module types of single crystalline and poly crystalline.
Do not connect any sources of energy other than these two types of PV modules to the
EnerSolar inverter. When designing the PV system, ensure that the values comply with the
permitted operating range of all components at all times. See Figure 1 for a simple diagram of
a typical PV system with EnerSolar Inverter.
1-2. Affecting Factors for Performance of the Inverter
There are a lot of factors to influence the performance of this inverter.
Rating for PV Modules
PV modules are rated at ideal factory conditions, such as specified illumination (1000 W/m2),
spectrum of the light and temperature (25 °C / 77 °F). This is called the STC (Standard Test
Condition) rating and is the figure that appears on the spec label of PV module. Generally
speaking, only around 60% to 70% of its peak STC-rated output will be produced from your
PV modules due to unpredicted environmental factors.
Temperature and Power Reduction
Environment temperature affects the power output of PV modules. Higher the temperature,
lower the power output of PV module. Comparing with pole-mounted PV module array,
roof-mounted PV module array generates less power due to less air circulation and excess
heat from roof top.
Conventions used:
WARNING! Warnings identify conditions or practices that could result in personal injury;
CAUTION! Caution identify conditions or practices that could result in damaged to the
unit or other equipment connected.
Important: The inverter will reduce its output generation to protect its electronic circuits
from overheating and any damage under high temperature environment. For maximum power
output in high temperature, it’s recommended to mount the inverter in a shaded location with
good ventilation.
Angle of the Sun
The angle of the sun in relation to the PV array surface—the array orientation can dramatically
affect the PV array output. The array energy output will vary depending on the time of day and
time of year as the sun’s angle in relation to the array changes. Sunlight output decreases as
the sun approaches the horizons (such as in winter in Europe) due to the greater atmospheric
air mass it must penetrate, reducing both the light intensity that strikes the array’s surface and
spectrum of the light. In general, you can expect only four to six hours of direct sunlight per
day depending on what part of Europe the inverter is installed.
Partial Shade
Shading on a single PV module of the array will reduce the output power of the entire system.
Such shading can be caused by something as simple as the shadow of a utility wire or tree
branch on part of the array’s surface. This condition, in effect, acts like a weak battery in a
flashlight, reducing the total output, even though the other batteries are good. However, the
output loss is not proportionate to shading even a tiny bit of shading will reduce the PV power
to the inverter. The inverter is designed to maximize its power production in all of the above
situations using its proprietary MPPT algorithm.
Other Factors
Other factors to reduce power generation of a solar system are:
Dust or dirt on the modules
Fog or smog
Mismatched PV array modules, with slight inconsistencies in performance from one
module to another.
Inverter efficiency
Wire losses
Utility grid voltage
2. Important Safety Warning
Before using the inverter, please read all instructions and cautionary markings on
the unit and this manual. Store the manual where it can be accessed easily.
This manual is for qualified personnel. The tasks described in this manual may be performed
by qualified personnel only.
General Precaution-
WARNING! Before installing and using this inverter, read all instructions and cautionary
markings on the inverter and all appropriate sections of this guide.
WARNING! Normally grounded conductors may be ungrounded and energized when a
ground fault is indicated.
WARNING! This inverter is heavy. It should be lifted by at least two persons.
CAUTION! Authorized service personnel should reduce the risk of electrical shock by
disconnecting both the AC and DC power from the inverter before attempting any
maintenance or cleaning or working on any circuits connected to the inverter. Turning off
controls will not reduce this risk. Internal capacitors can remain charged for 5 minutes after
disconnecting all sources of power.
CAUTION! Do not disassemble this inverter yourself. It contains no user-serviceable parts.
Attempt to service this inverter yourself may cause a risk of electrical shock or fire and will
void the warranty from the manufacturer.
CAUTION! To avoid a risk of fire and electric shock, make sure that existing wiring is in good
condition and that the wire is not undersized. Do not operate the Inverter with damaged or
substandard wiring.
CAUTION! Under high temperature environment, heat sink of this inverter could be hot
enough to cause skin burns if accidentally touched. Ensure that this inverter is away from
normal traffic areas.
CAUTION! Use only recommended accessories from installer . Otherwise, not-qualified tools
may cause a risk of fire, electric shock, or injury to persons.
CAUTION! To reduce risk of fire hazard, do not cover or obstruct the heat sink.
CAUTION! Do not operate the Inverter if it has received a sharp blow, been dropped, or
otherwise damaged in any way. If the Inverter is damaged, called for an RMA (Return Material
Authorization).
3. Unpacking & Overview
3-1. Packing List
Before installation, please inspect the unit. Be sure that nothing inside the package is
damaged. You should have received the following items inside of package:
Inverter unit PV connectors x 2 sets Mounting plate Software CD Manual
3-2. Product Overview
1) LCD display panel (Please check section 8 for detailed LCD operation)
2) Interface connection RS485 (Modbus card)
3) Connectors for solar modules
4) Grid connection
5) LED indicators
4. Installation
4-1. Selecting Mounting Location
Consider the following points before selecting where to install:
Do not mount the inverter on flammable construction materials.
Mount on a solid surface
Although the unit is fitted with UV resistant components, direct exposure to sunlight
may cause a power reduction due to excessive heating.
This inverter can make noises during operation which may be perceived as a nuisance in
a living area.
Install this inverter at eye level in order to allow the LCD display to be read at all times.
For proper air circulation to dissipate heat, allow a clearance of approx. 20 cm to the
WARNING!! Remember that this inverter is heavy! Please be carefully when lifting out
from the package.
side and approx. 50 cm above and below the unit.
1. Employ the mounting plate as a
template for marking the positions of
the boreholes
2. Mount the mounting plate with
appropriate screws (M5,SUS304) into
four holes to fix the plate in place
3. Follow the below figure to place the
solar inverter onto the mounting
plate.
4. Check if the solar inverter is firmly
secured.
Dusty conditions on the unit may impair the performance of this inverter.
The ambient temperature should be between -25°C and 60°C to ensure optimal
operation.
The recommended installation position is to be adhered to (vertical).
Unused DC connectors and interfaces must be sealed with sealing plugs to ensure
protection class IP65 for the whole system (inverter & cables).
This inverter is designed with IP65 for outdoor applications with high humidity.
4-2. Mounting Unit with Wall Mounting Bracket
Please utilize the delivered mounting plate for problem-free installation of the solar inverter.
Installation to the wall should be implemented with the proper screws. Mount the wall bracket
so that the solar inverter can be easily attached to the wall. After that, the device should be
bolted on securely.
5. To avoid theft, you may add a lock
between mounting plate and inverter.
NOTE: Please follow below requirements to
choose suitable lock.
Model
Diameter(mm)
Conductor cross-section
(mm2)
AWG no.
Temperature
EnerSolar
3kW
6± 0.2
≥3
≤12
125°C
5. Grid (AC) Connection
5-1. Preparation
Before connecting to AC utility, please install a separate circuit breaker between inverter and
AC utility. This will ensure the inverter can be securely disconnected under load.
NOTE1: Although this inverter is equipped with a fuse (F1 point on PCB, 250VAC/20A), it’s
still necessary to install a separate circuit breaker for safety consideration. Please use
250VAC/20A circuit breaker.
NOTE2: If you want to add a manual RCMU, it shall be type B.
WARNING! It's very important for system safety and efficient operation to use appropriate
cable for grid connection. To reduce risk of injury, please use the proper recommended cable
size as below.
Suggested cable requirement for AC wire
5-2. Connecting to the AC Utility
Step 1: Check the grid voltage and frequency with an AC voltmeter. It should be the same to
“VAC” value on the product label.
Step 2: Turn off the circuit breaker.
Step 3: Insert utility cable through cable gland. Connect wires according to polarities
indicated on terminal block.
L→LINE (brown or black)
Step 4: Fasten the gland plate with attached screws.
Step 5: Twist the gland so that the cable is firmly
connected.
G→Ground (yellow-green)
N→Neutral (blue)
CAUTION: To prevent risk of electric shock, ensure the ground wire is properly earthed
before operating the solar inverter.
WARNING: This inverter is only compatible to two types of PV modules: single crystalline
and poly crystalline. To avoid any malfunction, do not connect any sources of energy other
than these two types of PV modules to the EnerSolar inverter.
NOTE: To optimize the inverter performance, the two PV arrays should be the same.
6. PV Module (DC) Connection
CAUTION: Before connecting to PV modules, please install a separate circuit breaker
between inverter and PV modules.
NOTE: Please use 500VDC/12A circuit breaker.
Please follow below steps to implement PV module connection:
Step 1: Assemble provided PV connectors into PV modules by following below steps.
Negative terminal connection
Positive terminal connection
Model
Diameter(mm)
Conductor cross-section
(mm2)
AWG no.
Temperature
EnerSolar
3kW
6± 0.2
≥3
≤12
125°C
CAUTION: Exceeding the maximum input voltage can destroy the unit!! Check the system
before wire connection.
Step 2: Remove the cover of PV modules. Check the input voltage of PV modules. The
acceptable input voltage of the solar inverter is 125VDC - 500VDC. The maximum current load
of each PV input connector is 10A.
Step 3: Disconnect the circuit breaker.
Step 4: Check correct polarity of connection cable from PV modules and PV input connectors.
Then, connect positive pole (+) of connection cable to positive pole (+) of PV input connector.
Connect negative pole (-) of connection cable to negative pole (-) of PV input connector.
WARNING! It's very important for system safety and efficient operation to use appropriate
cable for grid connection. To reduce risk of injury, please use the proper recommended cable
size as below.
Suggested cable requirement for AC wire
CAUTION: Never disconnect running inverter from AC Grid. If it’s necessary to turn off the
inverter, disconnect the AC breaker first and then DC breaker next.
CAUTION: Never directly touch terminals of the inverter. It will cause lethal electric shock.
Step 5: Insert the sealing caps provided into unused DC connectors on the inverter.
7. Commissioning
Step 1: Check the following requirements before commissioning:
Ensure the inverter is firmed secured
Check if the open circuit DC voltage of PV module meets requirement (Refer to Section
6)
Check if the open circuit utility voltage of the utility is at approximately same to the
nominal expected value from local utility company.
Correct connection to grid
Full connection to PV modules
Unused DC input connectors are sealed with supplied sealing plugs.
AC circuit breaker and DC circuit breaker are installed correctly.
Step 2: Switch on the AC & DC circuit breakers. All three LEDs will light up. Then:
If green LED lights up, commissioning has been successfully.
Or, if yellow LED lights up, there is insufficient radiation and the inverter is in standby
mode. Wait for sufficient radiation.
Or, if red LED lights up, there has been an error. Please inform your installer.
Display
Function
Indicates input voltage of PV module 1 or PV module 2.
P1: PV1, P2: PV2, V: voltage
Indicates AC output voltage or frequency.
V: voltage, Hz: frequency
Indicates current feeding power.
Indicates energy generated today.
Indicates total energy generated so far.
Indicates that the warning occurs.
Indicates that the fault occurs.
Indicates fault code in fault mode or WR for warning
situation.
Indicates PV module status.
8. Operation
8-1. Interface
This LCD panel with 3 indicators shows current status and
value of your system. This display is operated by four
buttons.
NOTICE: To accurately monitor and calculate the energy generation, please calibrate the
timer of this unit via software every one month. For the detailed calibration, please check the
user manual of bundled software.
NOTEC: There is a battery inside of control board. It’s recommended to replace the battery
every 5 years. Check the replacement procedure in Maintenance section.
8-2. LCD Information Define
Each indicates 150VDC. When input voltage is
below 100VDC, icon will flash.
When both of PV modules are not connected,
icon will flash.
Indicates the Inverter circuit is working.
Indicates grid.
Indicates energy generated in graphic bar.
8-3. Button Definition
Button
Function
Up Button
Press this button to select last selection or increase value.
Down Button
If it’s in query menu, press this button to select next selection
or decrease value.
Press this button to mute alarm in standby mode.
ENTER Button
Press to enter query menu.
If it’s in query menu, press this button to confirm selection or
entry.
ESC Button
Press to return to last menu.
Procedure
LCD Display
Default setting is P1.
NOTE: If backlight shuts off, you may activate it by pressing any button. When an error
occurs, the buzzer will continuously sound. You may press any button to mute it.
8-4 Query Menu Operation
This display shows current values of your system. This displayed values can be changed in
query menu via button operation. Press “Enter” button to enter query menu. There are three
query selections:
Input voltage of PV modules
Frequency or voltage of AC output
Graphic bar display of power generation in yearly, monthly, or daily basis.
Setting Display Procedure
Input voltage of PV module
Frequency or voltage of AC output
Procedure
LCD Display
Energy generation
Energy generation display of selected year in monthly basis
Procedure:
LCD Display:
Energy generation display of selected month in daily basis
Procedure:
LCD Display:
Press “up” button to display info from 17th to 30th.
Energy generation display of selected date in hourly basis
Mode
LCD Display
Indicator
Alarm
Description
Power on
mode
All three
LEDs light
up.
Off
The inverter is
initializing.
Grid
mode
Green LED
lights up
Off
The inverter is feeding
power to the grid.
Standby
mode
Yellow LED
lights up
Sounding
every 5 sec.
The inverter is waiting
for the DC voltage to
reach a certain level so
that it can start
feeding the grid.
Fault
mode
and
icons will flash.
Red LED
lights up
Continuously
sounding
An error occurs inside
of the inverter. Please
inform your installer.
Procedure:
LCD Display:
Press “down” button to display info in AM
8-5. Operation Mode & Display
8-6. Self test
Please follow below steps to complete the self-test:
Step 1: Connect the inverter to your computer, and start up the SolarPower that installed in
your computer.
Step 2: Click the menu into self-test.
Step 3: Click “start” and then “yes”.
Step 4: Wait for a moment and then popup a interface, it displays the result of the self-test. So
far the self-test is completed.
WARNING: There are no user-replaceable parts inside of the inverter. Do not attempt to
service the unit yourself.
9. Maintenance & Cleaning
Check the following points to ensure proper operation of whole solar system at regular
intervals.
Heat sink of the inverter should be cleaned from dust.
WARNING: Although the inverter is designed in sealed IP65 enclosure, it is not
recommended to use a pressure washer to clean the inverter, or use other high pressure
cleaning methods that could allow water or moisture to enter the unit.
Clean the PV modules, during the cool time of the day, whenever it is visibly dirty.
Periodically inspect the system to make sure that all wires and supports are securely
fastened in place.
Record the output power of the system and compare with the record on the same day in
last year to realize the performance of the solar system. Do maintain the log of system
performance for records.
10. Trouble Shooting
No PV module is connected
flash failure
Inverter initial failure
Line loss
Islanding is detected
Fault event
Fault code
Icon(flashing)
Over voltage on Bus
1 Under voltage on Bus
2 Time out for Bus soft start
3 Time out for Inverter soft start
4
Inverter over current
5 Over temperature
6 Relay fault
7 Output current sensor failure
8 High voltage on PV module
9 Power down
10 DC input over current
11 GFCI failure
12 PV insulation failure
13 Inverter DC current over
14 Line value consistent fail between MCU & DSP
15 GFCI sensor failure
16 Connection failure between MCU & DSP
17 Communication failure between MCU & DSP
18 Ground loss
19
When errors or fault conditions occur, it will display icon in LCD. Please contact your
installer to solve the problem.
10-1. Warning Situation
There are 5 situations defined as warnings. When a warning situation occurs, icon will
flash and the fault code area will display “WR” wordings.
10-2. Fault Reference Codes
When a fault occurs, the icon will flash as a reminder. See below for fault codes for
reference.
11. Specifications
MODEL
EnerSolar 3KW
INPUT (DC)
Max. DC Power
3200W
Maximum DC Voltage
500 VDC
MPP Voltage Range
150 VDC ~ 450 VDC
DC Nominal Voltage
370 VDC
Start-up Voltage / Initial Feeding Voltage
116VDC / 150VDC
Maximum Input Current / Per String
2 x 10A / 10 A
Number of MPP Trackers / Strings per MPP
Tracker
2 / A:1;B:1
OUTPUT (AC)
AC Nominal Power
3000 W
Maximum AC Apparent Power
3000 VA
Nominal AC Voltage / Range
230 VAC / 184 VAC ~ 253 VAC
AC Grid Frequency
50 Hz
AC Grid Frequency Range
47.5~ 50.2 Hz
Nominal Output Current
13A
Power Factor @ > 50% load
> 0.99
EFFICIENCY
Maximum Efficiency @ Nominal Voltage
96.5%
European Efficiency @ Nominal Voltage
95.5%
PROTECTION
DC Reverse-Polarity Protection
Yes
Ground Fault Monitoring
Yes
Grid Monitoring
Yes
AC Short Circuit Protection
Yes
PHYSICAL
Dimension, D X W X H (mm)
420 x 415 x 170
Net Weight (kgs)
20.5
INTERACE
Intelligent Slot
Modbus card / Optional SNMP card
ENVIRONMENT
Protection Degree
IP65/Pollution Degree Ⅲ
Humidity
0 ~ 100%
Operating Temperature
-25°C to 60°C*
Altitude
0 ~ 1000 m
* When temperature is above 50°C, the unit will de-rate the capacity 10 % per centigrade.
Voltronic Power Technology (Shenzhen) Corporation
ADD: 1-4F, Building 5, YuSheng lndustrial Park, No.467, Section Xixiang, National
Highway 107,
Xixiang, Bao An District, Shenzhen, China
TEL: +886-2-27918296
FAX: +886-2-87918216
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