opti-solar GT 3000, GT, GT4000, GT1500, GT2000 Installation And Operation Manual

Solar On-Grid Inverter

GT Series

Installation and Operation Manual

English

Only an electro-skilled person or trained assembly staff can install or
open the Inverter.

Before you start…

Thanks for purchasing OPTI-Solar. GT Series Inverter is a highly reliable
product due to innovative design and perfect quality control.
This manual contains important information of installation, operation and
safety reminding of this unit. Be sure to read this manual carefully before
enjoying this product.
If you encounter any problem during installing or running this unit, please
check this manual first before contacting with your local dealer or
representative. Most of the problems you encountered will be solved
according to the instruction inside.

Thank you for purchasing our product again. Please keep this manual in safe
place for later use.

Safety instructions

z Risk of Electric Shock

1. Do not remove the covers. No user serviceable parts inside. Refer
service to qualified service personnel.

2. Both AC and DC voltage sources are terminated inside this equipment.
Each circuit must be individually disconnected before servicing.

3. When a photovoltaic array is exposed to light, it supplies a DC voltage to
this equipment.

4. Risk of electric shock from energy stored in capacitors. Do not remove
cover until 3 hours after disconnecting all power sources.

5. This unit is designed to feed power to grid (utility) only, do not connect
this unit to AC power supplier. If connecting to those facilities, AC power
supplier will be damaged.

6. Please take out the unit from packaging box carefully. Check if there is
any outside damage. If you find any damage, please contact with your
local dealer.

WARNING: HIGH LEAKAGE CURRENT EARTH CONNECTION ESSENTIAL
BEFORE CONNECTING SUPPLY.

2. Installation

Before starting installation please check the following items:

This unit is designed for indoor and outdoor usage. But it is suggested

that the unit can’t be exposed under rain or water directly and use a
shelter to protect the unit would be better.

Do not expose this unit to the sun directly. This may reduce the output

power due to high temperature.

Check the ambient temperature of installation is within specification

(-25~+55°C).

The grid to be connected is 230V system.
The connection to grid is approved by utility company .

The installation must be done by qualified personnel .
Though GT can be installed where temperature up to 50°C, we still strongly
recommend that it should be installed where ambient temperature in the range
of 0~40°C.

Mount GT to the wall

1. Select a wall or solid place can support the inverter.

2. Convection cooling space required. To dissipate the heat generated by

inverter, 25cm space at least on the top and bottom is necessary.

3. Mark the hole position according to following table or mounting template

attached.

W (mm)

GT1500 GT2000 GT3000 GT4000

347.6 347.6 347.6 546

H (mm)

4. Drill the holes with screw.

257 257 257 257

5. Hang the inverter on the 4 screws.

6. Drive “fix screw” on bottom leg to fix the inverter.

Be sure to check the mounting of inverter. Try to lift up the inverter on the
bottom, make sure it is firmly attached.

Select the installation location carefully. The height of inverter is
recommended to be seeable, so that user can check the inverter status easily;
the wall must be firmly enough, this can prevent slight vibration during inverter

wwoorrkkiinngg..

Connect to grid (AC utility)

1. Check the grid (utility) voltage and frequency, 230VAC (or 220VAC),

50/60Hz, single phase.

2. Open the AC breaker or fuse between AC wire and utility.

3. For GT4000 GT3000 GT2000 GT1500, connect AC wires as follows:

Disassemble female socket.
Connect AC wires to connection socket as indication:

Female insert

with coupling ring

Shell

Pinch ring

Pressing
screw

AC wire
inserting
direction

Insert Line wire to L, Neutral wire to N and Ground wire to pin
Assembly the socket again. Insert the whole socket set to inverter.

Twist the coupling ring to receptacle on inverter. Make sure it is

perfectly matched.

4. Suggested wire size for AC cable:

Model

φ (mm)

AWG no.

GT1500

≥1.29 ≤16

GT2000

≥1.29 ≤16

GT3000

≥1.72 ≤14

GT4000

≥2.05 ≤12

Connect to PV array (DC)

1. Turn off the DC switch.

2. Make sure the maximum open circuit voltage (V

oc

) of each PV string is

less than 500V UNDER ANY CONDITION. We recommend use PV array
which V

oc

is less than 430VDC under 25°C ambient.

3. Use MC (Multi-contact or Tyco) connectors as PV array terminals.

4. Connect positive from array to (+) terminals and
negative to (-) terminals. Each DC terminal on GT can
withstand 20A DC current at most.

5. Turn on the DC switch.

Note:

Before connecting to DC terminals, please make sure the
polarity is correct. Incorrect connection will damage the unit
forever!

Checking

1. After connecting DC

1

, the message on the LCD display should be in the

sequence of “INV Waiting” → “No Utility” and the RED fault LED keeps on.

1

The AC is not connected yet!

2. Close the AC breaker or fuse in previous section, check whether the
inverter starts to work.

3. If inverter works normally, the LCD will show “Working mode”. That is the
power feed to grid.

4. The checking is completed.

3. System diagram

1. The connection of whole PV system is indicated as figure.

2. PV array: Provide DC power to GT inverter.

utility

Connection

system

PV array

3. GT inverter: Convert DC power from PV array to AC (Alternative Current)
power. Because GT is a grid-connected inverter, it works to control its
current amplitude according to power provided from PV array. GT always
try to get maximum power from PV array.

4. Connection system: The “interface” between Utility and inverter. It may
consist of electrical breaker, fuse and terminals for connection. To make
sure safety, this part must be designed by qualified technician.

5. Utility: It is also call “grid” in this manual. The way your power company
provides power to your place. Please note that, GT can connect to
low-voltage system (namely, 220, 230VAC) system only.

4. Inverter status

GT is designed to be friendly, therefore, the status of inverter can be easily
understood by panel display. All the possible information is shown in the
following table.

Display information
LED

There are 2 LED’s on GT, one is blue and the other is red.

1. Power on (Blue LED): It lights when GT is working.
It will be dark when fault mode or shutdown mode.

2. Fault (red LED): Once the LED light, it means inverter meets “fault” or

“failure” conditions. The detail conditions can be found in the table
below.

LCD

(A) In generally, LCD will show “Working Mode” as GT is working.

(B) When LCD shows “Working Mode”, press button over 3 sec., LCD will

show “Setting” then enter setting function mode:
LCD Contrast setting > press button over 3 sec. to enter
Press button to select: Contrast 1 to Contrast 5

Then press button over 3 sec.

LCD will show “Setting”, Contrast setting is OK.

LCD Language setting > press button over 3 sec. to enter
Press button to select: English or German.

Then press button over 3 sec.

LCD will show “Setting”, Language setting is OK.

If user doesn’t touch button over 5 sec.,

LCD will escape setting function mode.

(C) In “Working Mode”, you can toggle button to enter meter value mode,

LCD will show general meter value by turns:

O/P Watt =
PV Volt =
Grid Volt =
Grid Freq =
O/P Cur =

xxx KWH (O/P energy)
Rating= xx KW (PV Inverter Rating)
M CPU Ver xxx (Firmware version of Mater CPU )
S CPU Ver xxx (Firmware version of Slave CPU)

1). If user doesn’t touch button over 5 sec., LCD will escape meter value
mode then LCD shows “Working Mode”.

2). During meter value mode, if user press button over 5 sec., the current
screen will “Freeze” (Lock).

3). If screen is freezing (Lock), user press button over 5 sec., the current
screen will “Unfreeze” (Unlock).

(D) Error Message:
No Utility No AC Line
PV Over Voltage PV Voltage is too high
DC Bus High DC bus voltage is too high
DC Bus Low DC bus voltage is too low
Over Temperature Temperature is too high
Grid Fault Grid Voltage or Grid Frequency is wrong
Device Fault Hole sensor, GFCI Device

or AD Reference Voltage Fault
Isolation Fault PV Panel isolation problem
Impedance Fault Grid Impedance Fault
Ground I Fault Output ground leakage current too high
Relay Failure Output Relay Fail
DC INJ High Output DC injection too high
Ref 2.5V Fault 2.5V reference voltage inside problem
DC Sensor Fault Output DC sensor abnormal
GFCI Fault GFCI detection problem
Sci Fault Communication between Master and Slave problem
Consistent Fault The value of Master and Slave are mismatch
CPU Ver Mismatch Firmware Version of Master and Slave are not

the same
EEPROM Fault EEprom problem
Grid V Mismatch The Grid V of Master and Slave are mismatch
Grid F Mismatch The Grid F of Master and Slave are mismatch
Grid Z Mismatch The Grid Impedance of Master and Slave are

mismatch
GFCI Mismatch The GFCI value of Master and Slave are mismatch
DC Curr Mismatch The Output DC current of Master and Slave are
mismatch

Message table in English

Operating conditions

Normal working status

Power off No display
Standby INV Standby 90V< Input voltage < =100V.

Initialization & waiting INV Waiting

Check grid Testing
Feeding grid, MPPT Working Mode Inverter is feeding power.

Updating Master CPU firmware Master Flash

Updating Slave CPU firmware Slave Flash

Monitoring parameters

Instantaneous Output power

Accumulated energy information xxxxx KWh

Grid voltage

Grid frequency

AC feeding current

PV panel voltage

Isolation failure Isolation Fault
GFCI

(Ground Fault Current Interrupter)
active

Display

message

O/P

Watt=xxxxW

GRID

VOLT=xxx.xV

GRID

FREQ=xx.xHz

O/P

CUR=xx.xA

PV

VOLT=xxx.xV

System fault

Ground I Fault

Description

PV inverter is totally shutdown, IPV
<=90V.

Input voltage range 100~150V
during start-up. After PV voltage is
higher than 100V, inverter is waiting
for feeding to grid.
When PV voltage> 150V, inverter is
checking feeding conditions.

The internal program is updating
Master CPU through RS232
interface.
The internal program is updating
Slave CPU through RS232 interface.

The real time output power in xxxx
W.
Total energy which has been feed to
grid since inverter was installed.

Grid voltage in xxx.x VAC.

Grid frequency in xx.x Hz.

AC grid current amount in xx.x A.
Input voltage from PV panel, xxx.x

VDC.

Earth fault of the PV-panels or
failure of surge voltage protection.

Current on ground conductor is too
high.

Grid failure Grid Fault

Abnormal Grid Impedance

No grid utility voltage No Utility

DC-Input voltage too high

Consistent failure

Bus failure

Device failure Device Fault

Temperature too high

Impedance

Fault

PV Over

Voltage

Inverter failure

Consistent

Fault

DC Bus High
DC Bus Low

Over

Temperature

Grid measured data is beyond the
specification (voltage & frequency).

1. Grid impedance higher than the
permissible value.

2. Grid impedance change is higher
than limit.

1. Inverter is not connected to grid

2. Grid is absent.

DC-Input voltage higher than the
permissible 500V.

The readings of 2 microprocessors
are not consistent. It is probably
caused of CPU and/or other circuit
do not function well.

DC-Bus voltage too high or too low.
The device is unable to return to

normal status.
The internal temperature is higher
than specified normal value.

5. Communication

GT is equipped with power communication interface and options. User can
use “Solar Control” software to monitor the status of inverter with PC. Also,
qualified personnel can upgrade the f/w inside through RS232 port.

1. RS232: To use RS232 port, you have to remove the RS232 cover on
bottom side of GT. It is a DB9 socket, the pin definition is :

Pin Assignment Description

1 N.C.
2 TxD
3 RxD
4 N.C.
5 Common
6 N.C.
7 N.C.
8 N.C.
9 N.C.

NN..CC.. mmeeaannss ““NNoo CCoonnnneeccttiioonn””

2. Optional communication slot: This slot is a very powerful extension slot
now and future. GT can accept card special design for the slot only. There
are 2 kinds of cards can be applied now. One is RS485 card and the other
is SNMP (Simple Network Management Protocol) card. In the future,
extension card such as data logger or others may be developed. For card
detail information, please refer to use manual of individual card.

3. F/W upgrade: To keep the firmware newest, one can use RS232 port and
special program to upgrade inside F/W. To do this, please contact with
your local representative.

We do not suggest end-user to upgrade the f/w himself. There is risk to do
that without proper operations!

6. Trouble shooting

In this section, the trouble-shooting techniques are stated. This can help the
technician to understand the problem and decide a proper action.

Tools to be prepared:

1. Digital Multi-Meter: For checking DCV, ACV, ACF (AC frequency) and

open-short circuit.

2. Screwdriver: For removing unit form bracket and disconnect wiring

3. This manual.

4. Laptop computer with the installation of PCM solar control and Firmware

upgrade program.

5. Standard RS232 cable.

6. Oscillate Scope (Not necessary).

Fault condition message in English

Fault Display Possible actions

1. Check the impedance between PV (+) & PV (-) and earth ground.

System

fault

Isolation

Fault

Ground I

Fault

Grid Fault

Impedance

Fault

No Utility

The impedance must be larger than 8MΩ.

2. If above action is useless, the isolation detection circuit fails, replace
one unit.

1. This is caused by too high ground current.

2. Unplug PV generator from the input, check AC peripheral system.

3. After the cause is cleared, plug PV input again. Check the status of
the inverter.

4. If above actions are useless, the GFCI circuit fails, replace one unit.

1. Wait for 20 seconds, if the grid come back to normal, inverter will
start again automatically.

2. Make sure grid voltage and frequency meet the specifications.

3. Use PCM solar control to adjust operation range.

4. If above actions are useless, replace one unit.

1. Grid impedance higher than the permissible value.

2.Wait for 20 seconds, see if it works again.

3.Check the wires between inverter and grid. Change larger wires if

necessary.

4.Adjust impedance parameter by PCM solar control program.

5. If useless, the impedance circuit inside fails, please replace another.

1. Grid is not connected; check the AC connection by multi-meter.

2. Check grid connection, such as wire and connector to the inverter.

3. Check breaker between inverter and grid; if it is tripped, DO NOT
CLOSE again, replace another unit.

Fault Display Possible actions

1. Check the PV open voltage, see if it is more than or too close to
500VDC.

2. If PV voltage is much less than 500VDC (e.g. <430V), measure the
DCV by multi-meter, compare the readings on meter and LCD, if
>5%, replace another unit.

1. It is caused by the reading between main and redundant controllers
are different.

2. Disconnect PV (+) or PV (-) from the input, start the unit again.

3. If this does not work, replace another one.

1. Caused by improper operation of the circuit.

2. Disconnect PV (+) or PV (-) from the input, start the unit again.

3. If it does not work, replace another one.

1. The internal temperature is higher than specified normal value.

2. Reduce the ambient temperature by some other ways.

3. Or move inverter to cooler place.

4. If it is not effective, the temperature sensors fails, replace another
one.

Inverter

failure

PV Over

Voltage

Consistent

Fault

Device Fault

Over

Temperature