MasterPower Omega ESS 5.5KW User manual

Omega ESS
Energy Storage System
Version: 1.0
User Manual

Table of Contents
1. Introduction.......................................................................................... 1
2. Important Safety Warning...................................................................... 2
3. Unpacking & Overview .......................................................................... 4
3-1. Packing List................................................................................... 4
3-2. Product Overview .......................................................................... 5
4. Installation ........................................................................................... 7
4-1. Selecting Mounting Location........................................................... 7
4-2. Mounting The System .................................................................... 7
5. Wiring Connection................................................................................13
5-1. Grid Connection ...........................................................................13
5-2. PV Module (DC) Connection ..........................................................14
5-3. Battery Connection.......................................................................17
5-4. Load (AC Output) Connection........................................................19
6. Communication ....................................................................................20
6-1. Communication Connection...........................................................20
6-2. Dry Contact Connection ................................................................21
7. Commissioning.....................................................................................22
8. Initial Setup by using monitoring software .............................................23
9. Operation ............................................................................................33
Operation and Display Panel ................................................................33
Touchable function key ........................................................................33
LCD Display Icons ...............................................................................34
LCD Setting.........................................................................................37
Operating Mode Description .................................................................46
Select Displays ....................................................................................51
10. Maintenance & Cleaning .......................................................................55
11. Trouble Shooting..................................................................................56
11-1. Fault code reference ...................................................................56
11-2. Warning Reference Codes ...........................................................59
12. Specifications.......................................................................................59
Appendix I: The Wi-Fi Operation Guide.........................................................61
1. Introduction ....................................................................................61
2. SolarPower App Installation .............................................................61
3. SolarPower APP Operation ...............................................................65

1
1. Introduction
This energy storage system can provide power to connected loads by utilizing PV power,
utility power and battery power and store surplus energy generated from PV solar
modules for use when needed. When the sun has set, energy demand is high, or there is
a black-out, you can use the energy stored in this system to meet your energy needs at
no extra cost. In addition, this energy storage system helps you pursue the goal of
energy self-consumption and ultimately energy-independence.
Depending on different power situations, this energy storage system is designed to
generate continuous power from PV solar modules (solar panels), battery, and the utility.
When MPP input voltage of PV modules is within acceptable range (see specification for
the details), this energy storage system is able to generate power to feed the grid (utility)
and charge. This energy storage system is only compatible with PV module types of single
crystalline and poly crystalline. Do not connect any PV array types other than these two
types of PV modules to the energy storage system. Do not connect the positive or negative
terminal of the solar panel to the ground. See Figure 1 for a simple diagram of a typical
energy storage system.
Figure 1 Energy storage System Overview
Note: To conform to the EEG standard, every energy storage system sold to German area
is not allowed to charge from Utility. The relevant function is automatically disabled via
the software.

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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 so heavy that it should be lifted by at least two persons.
CAUTION! Before attempting any maintenance or cleaning or working on any circuits
connected to the inverter, disconnecting AC, DC and battery power from the inverter can
reduce the risk of electric shock. Merely turning off controls will not reduce this risk
because internal capacitors can remain charged for 5 minutes after disconnecting all
sources of power.
CAUTION! Do not disassemble this inverter by yourself. It contains no user-serviceable
parts. Attempt to service this inverter by yourself may cause electric shock or fire and will
void the warranty from the manufacturer.
CAUTION! To avoid fire and electric shock, make sure that existing wiring is in good
condition and that the wire is not undersized. Do not operate the damaged Inverter or
substandard wiring.
Conventions used:
WARNING! Warnings identify conditions or practices that could result in personal injury;
CAUTION! Caution identify conditions or practices that could result in damage to the unit
or other equipment connected.

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CAUTION! In high temperature environment, the surface 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, disqualified tools
may cause fire, electric shock, or injury to persons.
CAUTION! To reduce risk of fire hazard, do not cover or obstruct the cooling fan.
CAUTION! Do not operate the Inverter if it has undergone a sharp blow, been dropped,
or damaged in any way. If the Inverter is damaged, please call for an RMA (Return Material
Authorization) request.
CAUTION! AC breaker, DC switch and Battery circuit breaker are used as disconnect
devices and these disconnect devices shall be easily accessible.
Symbols used in Equipment Markings
Refer to the operating instructions
Caution! Risk of danger
Caution! Risk of electric shock
Caution! Risk of electric shock. Energy storage timed
discharge for 5 minutes.
Caution! Hot surface
Before working on this circuit
-Isolate inverter/Uninterruptible Power System (UPS)
-Then check for Hazardous Voltage between all terminals including the
protective earth.
Risk of Voltage Backfeed

4
3. Unpacking & Overview
3-1. Packing List
Before installation, please inspect the unit. Be sure that nothing inside the package is
damaged. To guarantee goods in good condition during transportation, we offer separate
packages for inverter and battery unit.
Inverter Package
You should receive the following items inside of package:
Inverter module PV connector Software CD Manual WiFi antenna
(1) (1 set)
Mounting brackets L-type plate Flat-head screws Mounting screws Energy meter
(2)
RJ45 cable (x1)
Battery Module Package
Battery module Battery cable Mounting bracket L-shape plate
Round-head screws Flat-head screws Mounting screws
RJ11 cable (x1) RJ11 signal cable

5
3-2. Product Overview
Inverter Module
Side view Front view
1. LCD display
2. Touchable function buttons
3. Power on/off button
4. PV connectors
5. AC output
6. AC input
7. AC breaker
8. PV breaker
9. DC breaker
10. Dry contact
11. USB port
12. RS-232 port
13. BMS com. port
14. Battery connectors
15. Intelligent slot

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Battery Module
Side view Front view
1. Power on/off button
2. Battery capacity indicators
3. Battery status indicators
4. RS485 port (BMS com. port)
5. Extension port
6. ID switch
7. Battery connecters
8. DC breaker

7
4. Installation
4-1. Selecting Mounting Location
Consider the following points to install the energy storage system:
Do not mount the inverter on flammable construction materials.
Mount on a solid surface
This energy storage system might make noises during operation which may be
perceived as a nuisance in a living area.
Install this inverter module at eye level in order to allow the readability of LCD
display at all times.
For proper air circulation to dissipate heat and further maintenance, allow a
clearance of approx. 50 cm to the sides of the unit.
Dusty conditions on the unit may impair the performance of this inverter.
The ambient temperature should be between 0°C and 40°C and relative humidity
should be between 5% and 85% to ensure optimal operation.
The recommended installation is vertical adherence.
For proper operation of this energy storage system, please use appropriate cables
for grid connection.
The pollution degree of the energy storage system is PD2. Select an appropriate
mounting location. Install the inverter and battery modules in a protected area
that is dry, free of excessive dust and with adequate air flow. Do NOT operate it in
the place where the temperature and humidity is beyond the specific limits.
(Please check the specs for the limitations.)
The inverter should be installed in the position where the disconnection means is
easily accessible.
This inverter is designed with IP20 protection for indoor applications only.
Regularly clean the fan filter.
4-2. Mounting The System
Installation to the wall should be fixed with proper screws. After that, the device should
be bolted on securely.
The energy storage system can only operate in a CLOSED ELECTRICAL OPERATING
AREA. Only service personnel can enter this area.
WARNING!! FIRE HAZARD.
SUITABLE FOR MOUNTING ON CONCRETE OR OTHER NON-COMBUSTIBLE SURFACE
ONLY.
WARNING!! Remember that this inverter is heavy so please be careful when
removing it from the package.

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This energy storage system should be installed battery modules first on the bottom and
then inverter module on the top.
Step 1: Remove side cover of battery module first.
Step 2: Fix two mounting brackets on the top and bottom of the battery module
separately with three flat-head screws as shown in the chart.
Step 3: Use a tape to hold supplied “Mounting bracket of battery module positioning”
paper in place against the wall. Use a sharp nail to puncture the center of the eight
holes marked with arrow as shown below chart.

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Step 4: Drill φ8 holes on the remarked wall and insert one nylon plug inside of each
hole. Fix two mounting brackets against the wall with screws, four for each bracket.
Step 5: If there is one more battery module to stack on, please also remove side cover
first.
Step 6: Fix mounting bracket on the top of the second battery module with three flat-
head screws.
Step 7: Fix two L-shape plates on the bottom of the second battery module with four
flat-head screws.

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Step 8: Put the second battery module on the top of first battery module. Fix two L-
shape plates to the first battery module with four round-head screws. Then, fix the
second battery module to the wall with four screws.
Step 9: Before installing inverter module, remove side cover first.
Step 10: Use a tape to hold supplied “Mounting bracket of inverter module positioning”
paper in place against the wall. Use a sharp nail to puncture the center of the four holes
marked with arrow as shown below chart.

11
Step 11: Drill φ8 holes on the remarked wall. Insert one nylon plug inside of each hole.
Fix one mounting bracket against the wall with four screws.

12
Step 12: Fix two L-shape plates on the bottom of the inverter module with four flat-head
screws.
Step 13: Put the inverter module on the top of second battery module. Fix mounting
bracket with three flat-head screws. Then, fix two L-shape plates to the second battery
module with four round-head screws.

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5. Wiring Connection
Before connecting all wires, be sure that side covers of inverter and battery modules are
removed. This step should be executed before modules are installed to the wall.
5-1. Grid Connection
5-1-1. Preparation
Before connecting to AC utility, please install a separate AC circuit breaker between
surge protection device (SPD) and AC utility. This will ensure the inverter can be securely
disconnected during maintenance and fully protected from over current of AC input.
NOTE: The overvoltage category of the AC input is III. It should be connected to the
power distribution.
WARNING! For safety and efficiency, it's very important to use appropriate cables for
grid (utility) connection. To reduce risk of injury, please use the proper cable size
recommended below.
Suggested cable requirement for AC wire
Model
ESS
Nominal Grid Voltage
230VAC
Conductor cross-section (mm2)
6
AWG no.
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5-1-2. Connecting to the AC Utility
Step 1: Check the grid voltage and frequency with an AC voltmeter to see if it’s same as
the “VAC” value on the product label.
Step 2: Turn off the circuit breaker.
Step 3: Remove insulation sleeve 10 mm from three
conductors and shorten phase L and neutral
conductor N for 3 mm. Refer to chart 1.
Step 4: Connect wires according to the polarities indicating on terminal block. Be sure
to connect PE protective conductor (G) first.
L→LINE (brown or black)
N→Neutral (blue or white)
G→Ground (yellow-green)
Step 5: Make sure the wires are securely connected.
The reference tightening torque is 1.4~1.6N.m.
L
N
Chart 1
Chart 2

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5-2. PV Module (DC) Connection
CAUTION: Before connecting to PV modules, please install separately DC circuit
breakers between inverter and PV modules.
NOTE1: Please use 600VDC/30A circuit breaker.
NOTE2: The overvoltage category of the PV input is II.
Please follow the steps below to implement PV module connection:
Step 1: Check the input voltage of PV array modules. The acceptable input voltage of
the inverter is 250VDC-450VDC (with rated load). This system is applied with two strings
of PV array. Please make sure that the maximum current load of each PV input
connector is 13A.
Step 2: Disconnect the circuit breaker and switch off the DC switch.
Step 3: Assemble provided PV connectors with PV modules by the following steps.
Components for PV connectors and Tools:
Female connector housing
Female terminal
Male connector housing
Male terminal
Crimping tool and spanner
Prepare the cable and follow the connector assembly
process:
Strip one cable 8 mm on both end sides and be careful NOT to
nick conductors.
CAUTION: Exceeding the maximum input voltage can destroy the unit!! Check the
system before wire connection.
WARNING: Because this inverter is non-isolated, only three types of PV modules are
acceptable: single crystalline and poly crystalline with class A-rated and CIGS
modules.
To avoid any malfunction, do not connect any PV modules with possible current
leakage to the inverter. For example, grounded PV modules will cause current leakage
to the inverter. When using CIGS modules, please be sure NO grounding.
CAUTION: It’s requested to use PV junction box with surge protection. Otherwise, it
will cause damage on inverter when lightning occurs on PV modules.

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Insert striped cable into female terminal and crimp female terminal as shown below.
Insert assembled cable into female connector housing as shown below.
Insert striped cable into male terminal and crimp male terminal as shown below.
Insert assembled cable into male connector housing as shown below.
Then, use spanner to screw pressure dome tightly to female connector and male
connector as shown below.
Step 4: Check the correctness of the polarity of connection cable on 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! For safety and efficiency, it's very important to use appropriate cables for
PV module connection. To reduce risk of injury, please use the proper cable size as
recommended below.
Conductor cross-section (mm2)
AWG no.
4~6
10~12
CAUTION: Never directly touch the terminals of inverter. It might cause lethal
electric shock.

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Recommended Panel Configuration
Solar Panel
Spec.
(reference)
- 260Wp
- Vmp: 30.7Vdc
- Imp: 9.18A
- Voc: 38.9Vdc
- Isc: 8.56A
- Cells: 60
SOLAR INPUT 1
SOLAR INPUT 2
Q'ty of
panels
Total
Input
Power
(Min in serial: 6pcs;
Max. in serial: 12pcs)
6pcs in serial
x
6pcs
1560W
x
6pcs in serial
6pcs
1560W
8pcs in serial
x
8pcs
2080W
x
8pcs in serial
8pcs
2080W
6pcs in serial
6pcs in serial
12pcs
3120W
7pcs in serial
7pcs in serial
14pcs
3640W
8pcs in serial
8pcs in serial
16pcs
4160W
10pcs in serial
10pcs in serial
20pcs
5200W
12pcs in serial
12pcs in serial
24pcs
6240W
Solar Panel
Spec.
(reference)
- 500Wp
- Vmp: 42.8Vdc
- Imp: 11.69A
- Voc: 51.7Vdc
- Isc: 12.28A
- Cells: 150
SOLAR INPUT 1
SOLAR INPUT 2
Q'ty of
panels
Total
Input
Power
(Min in serial: 4pcs;
Max. in serial: 7pcs)
4pcs in serial
x
4pcs
2000W
x
4pcs in serial
4pcs
2000W
6pcs in serial
x
6pcs
3000W
x
6pcs in serial
6pcs
3000W
7pcs in serial
x
7pcs
3500W
x
7pcs in serial
7pcs
3500W
4pcs in serial
4pcs in serial
8pcs
4000W
5pcs in serial
5pcs in serial
10pcs
5000W
6pcs in serial
6pcs in serial
12pcs
6000W
CAUTION: Do NOT touch the inverter to avoid electric shock. When PV modules are
exposed to sunlight, it may generate DC voltage in the inverter.

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5-3. Battery Connection
CAUTION: Before connecting to battery modules, please disconnect the DC breaker
between inverter and batteries.
Step 1: Use supplied two battery cables. Follow the polarity of battery printed near the
battery terminal! Simply plug battery cable to battery terminals on inverter module and
battery module as shown in the chart.
ORANGE cable to the positive terminal (+)
BLACK cable to the negative terminal (-)
WARNING! Wrong connections may damage the unit
permanently.
Step 2: Make sure the wires are securely connected.
Step 3: Insert the supplied RJ45 cable
(from inverter module package) into the
BMS port on the inverter module. The other
end connects to RS485 port on the first
battery module.
Step 4: Insert the supplied RJ11 signal cable
(from battery module package) into one of the
extension port (or ) on the battery
module.

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Step 5: If there is second battery module to
connect, use supplied battery cable inside of battery
module package to connect the first battery module
and second battery module.
Follow the polarity of battery printed near the
battery terminal! Plug battery cable to battery
terminals on first battery module and second battery
module as shown in the chart.
ORANGE cable to the positive terminal (+)
BLACK cable to the negative terminal (-)
Step 6: Insert the supplied RJ11
cable (from battery module package)
into the extension port on the first
battery module. The other end
connects to extension port on the
second battery module.
Step 7: After all wiring installation is
complete, set up ID for each battery
module. The ID code for each battery
module MUST be unique. Not the
same number for 2 battery modules
in parallel system.