Full Text Searchable PDF User Manual
User Manual of 2
nd
Generation Grid Tie Inverter with Limiter
Grid Tie Inverter With Internal&External Limiter (GTIL)
2016-3-1 All rights reserved
1
Why we produced the GTI-L
--- It is in response to the overwhelming clamor from our
customers for a product that can control the amount of power that the grid tie inverters
(GTI) can generate so that the amount of excess power produced by the solar panels
are
reduced to insignificant levels, if not eliminated --- because in some countries,
the producer pays for the excess power it gives to the distribution grid. This
is because the electric power meters (the one provided by the electricity provider in the
area) are not aware of the direction of power flow. In other words it only adds even if
power is exported to the grid, thus, the consumers will be charged for power even if it is
given to the grid, and this is the problem
This is the 2
nd
generation GTIL of Masspower.The first generation GTIL must be used
with an additional limiter module,we also add an switch button to enable the inverter
either can work
at limit mode or at normal grid tie mode. With the 2
nd
generation GTIL,we integrated the
limit function inside the GTI-We call this internal limiter.In this way,No additional limiter
module is needed,reduced customer
’
s cost,more easier for installation.But in case
customer install inverter far away from the main circuit breaker,we also enable the 2
nd
GTIL work with stand-alone limiter,we call this-external limiter.For sure,the inverter can
work under normal Grid tie-no limit mode,just set on the nice LCD and save your setting.
1. On-Grid System Using Standard Grid Tie Inverter
1.1.
The Grid Tie inverter converts DC power produced by Solar Panels to AC,
connects to the grid and feed all of the power available from the panels to the
AC load.
1.2.
All excess power that is not needed by the load is then exported to the Grid.
1.3.
If the Grid fails, then the Grid Tie Inverter will turn off. When the Grid comes
back on line. The Grid Tie Inverter will again supply power to the load and any
excess power is exported to the Grid again.
1.4.
If the Solar Panel is producing less power and the GTI cannot deliver all the
power needed by the load, then power
will be supplemented by the Grid.
1.5.
Power Meters (Except smart meter) are not aware of the direction of Power
flow. The user then pays for the power exported and delivered by the Grid.
2.
On-Grid System Using Grid Tie Inverter With Limiter (GTIL)
2.1
The Grid Tie Inverter with Limiter delivers only the power needed by the load and
prevents delivering excess power hence avoids excess power in going back to
the Grid.
2.2
The heart of the Grid Tie Inverter with Limiter is the Limiter Module (LM). The LM
continuously sampled the power needed by the load through the current sensor
connected after the Main Circuit Breaker. The LM then will process the signal. It
then sends signal to Grid Tie Inverter how much power to deliver to the load in
real time.
2.3
The user, after installing and connecting the GTIL correctly, need not do anything
and the unit will do its work automatically.
3. The Limiter Module-Parts Description
3.1.
The LCD Display
Displays the Utility Power (grid power), Inverter Power (GTIL power), Utility KWH
and Inverter KWH.
3.2.
AC Receptacle For GTIL AC output
Two (2 pcs) - Connects the AC output of GTIL to LM. Can be plug in either
receptacle. Maximum Power per receptacle is 2kw or a total of 4kw GTIL can be
plugged in the two receptacles. The output of GTIL can also be directly
connected to the grid or through the house convenient outlet. But the LCD will
not display the Inverter Power.
3.3.
Clamp Sensor
Connects/clamps to one hot wire after the Main Circuit Breaker. Converts the
magnetic field created by the flow of current in the wire into small AC voltage and
current which is proportional to the power that passes through the wire.
3.4.
Clamp sensor AC signal socket
–
connects the clamp sensor AC signal to the
LM module.
3.5.
Terminal Block- AC power to Grid
The AC output of the GTIL is plugged to the LM receptacle in order for the LCD
to display the GTIL output in watts and KWH. The GTIL output is connected to
the Grid through the Terminal Block. Connecting the terminal block to AC grid
also powers the wattmeter and limiter circuit.
3.6.
Limiter DC Signal Output, 2 pcs
–
Connects the LM output signal to the GTIL
signal input. User can connect to any of the signal output receptacle.
4.
WIRING DIAGRAM WITH EXTERNAL LIMITER
4.1.
The installations of the GTIL system are shown above,The ac plug can either
connect to the nearby AC socket or plug into the limiter socket,the dc signal cable can
reach max 30 meters longth so that you can able to install the inverter far away from the
limiter module.The ideal installation is that the limiter install near the GTIL. The GTIL
unit and the Limiter Module are placed close to each other. The signal wires will be
short, as supplied with the unit.
4.2. Use a dedicated 20 A breaker for the GTIL in the Load Circuit breaker panel board
4.3.
Wiring and Connection Procedure
4.3.1. After the GTIL and LM are properly installed. Shut off the main circuit
breaker. Connect the clamp sensor to one hot wire after the main breaker.
Connect the other end of clamp sensor signal cable to the LM. Neatly lay out the
signal cable. You can now safely open the Main breaker.
4.3.2
Connect the LM module to grid. Using the terminal block, use at least wire no.12
AWG (20A ampacity - wire not included in the package) and connect to 20A
circuit
breaker dedicated for the GTIL.
Make sure the 20A breaker is off while wiring. Do
not turn on the breaker!
4.3.3 Connect the DC signal cable from LM to GTIL input. The connectors have
threaded screw to securely fasten the connectors plug at both ends of the cable.
Also the connector plugs have dent/slot in the plugs body so it can only be
connected in one direction or position.
Step 3-Connecting Limiter module DC output signal to GTIL
Using the dc signal cable which provided by supplier to connect the external
limiter connector of the GTIL to the limiter DC connector.DC output signal socket
in the limiter module is marked A and B,you can connect the connector of the
cable to either A or B.Plug in and screw in to lock.
Step4-Connect the solar panel cable to the GTIL DC input
4.3.5. Connect the Solar panel output to the DC power input of GTIL. Make sure
the disconnect switch/breaker of solar panel is off.
Before connecting the solar panel cable,make sure that the solar panel
disconnect switch or DC breaker is off and observe correct polarity when
connecting the cable.Failure to follow will cause serious problem with the unit.Pls
read the manual booklet of the GTI included in the package for correct wire and
circuit breaker/disconnect switch rating.Do not turn on the DC circuit
breaker/disconnect switch.
4.3.
6. Review all connections and make sure of the tightness of plugs and
connections. Re-check DC polarity connections of solar panel.
4.3.7. Turn on the 20A circuit breaker to power the Limiter Module.
4.3.8. In the LM, Press SET button below the LCD for a few seconds. The LCD
will light up and initialize.
4.3.8. After initialization, LCD will display Utility Power, which is the actual power
or total load in real time. Press the up and down buttons to display the Inverter
Power, Utility power, Utility Total KWH and Inverter Total KWH. Inverter Power
should read zero initially.
To reset the Utility Total, just press the up button for a few seconds and you will
be prompted yes or no to reset. Press up or down button to select either yes or
no, and then press SET to reset .
To reset Inverter Total, press the down button continuously and you will
prompted yes or no also to reset. Press up or down to select yes or no and
Press SET to reset.
4.3.9. Connect the GTIL power output to the LM AC receptacle using the
supplied cable. Turn on the disconnect switch/dc breaker of solar panel.
The wattmeter in the GTIL should power up and start producing power after a
minute or two.
4.3.10 Check the LM display. The utility power should display 0-15w indicating
the GTIL is already supplying power to the load. Check the inverter power display
in the LCD.
4.3.11 To shutdown, turn-off or unplug first the GTIL before disconnecting the
power to limiter module. Or shut off the breaker to LM module to cut power to
whole set-up. Do not disconnect Solar panel connection to GTIL while the system
is operating.
4.3.12 In normal operation, when the unit is started or the LM breaker is turned
on, while all the cables are connected and DC breaker is on, there will be about
2 minutes and 20seconds time delay before the GTIL unit will run. Always
remember that for LM module to power-up, need to press Set buttons first in the
LM module for the system to run.
5. Installation of GTIL With Internal Limiter
5.1.
This installation is not require an additional limiter module,Installation is much
easier.Clamp the current sensor cable to the hot wire to measure the
current,the internal limiter will auto detect the load power and control the
inverter output power,excess power will be well controlled.
5.2.
External protective device including dc and ac SPD(Surge protection
device),dc and ac breaker,etc is recommended to installed in the system.
Limiter Setting on the LCD of the inverter:
The GTIL include three working mode:Work as normal GTI without power
limitation.Work under Internal limiter mode and Work under External limiter mode,Pls
make your setting on the LCD and save it,details setting operation,pls read the GTI
manual.
The connector of Internal&External Limiter:
Attention:For external limiter mode.Need to long press the SET button
when initial power on the GTIL system after all connections are done.Due
to grid failure or malfunction,GTIL system will able to auto restart after grid
recover.
After sales service and technical support- For more information
about installation and other concerns, or if you have more
questions or clarification about the product.
6.0 Limiter Module Specification
1. Clamp sensor- Max 100A
2. Wattmeter- Max 9999w
3. Terminal Block-Max 20A
4. Receptacle- max 2000w
5. Clamp sensor signal- 5v AC max mA
6. DC signal Cable- 5v DC, ____ max mA
Available Masspower GTIL Model
1000W -Model SUN-1000GTIL2-LCD
22-60VDC/45-90VDC,120VAC/230VAC
2000W- Model SUN-2000GTIL2-LCD
45-90VDC/230VAC