Grid Tie SR-250-G User manual

SR-2000-G
SR-1000-G SR-1500-GSR-600-G
SR-500-G
SR-300-G
SR-250-G
Installation and Operations Manual
SR-G Series Grid Tie Power Inverter
1

Weight and Dimension of SR-G Series Grid Tie Power Inverter----------------------------------------------25
Outline Drawing of SR-G Series Grid Tie Power Inverter-------------------------------------------------------24
Technical Date of SR-G Series Grid Tie Power Inverter--------------------------------------------------------23
Layout of SR-G Grid Tie Power Inverter --------------------------------------------------------------------------20
Installing SR-G Grid Tie Power System to Three Phases Utility Grid------
Connecting SR-G Grid Tie Power System with Cables and Connectors-----
Installing SR-G Grid Tie Inverter to suitable place-------
Selecting Correct Model of SR-G Grid Tie Inverter---------
Choosing Applicable Solar panels for SR-G Series Grid Tie Inverte
SR-G Grid Tie Inverter Installation ----------------------------------------------------------------------------------7
Advantage of SR-G Grid Tie System -------------------------------------------------------------------------------6
Instruction of SR-G Series Grid Tie Inverter -----------------------------------------------------------------------5
SR-G series Grid Tie Inverter Models----------------------------------------------------------------------------------3
Model Name Description -------------------------------------------------------------------------------------4
Important Safety Information-------------------------------------------------------------------------------------------4
Safety Instruction----------------------------------------------------------------------------------------------------------4
Installation Procedure ---------------------------------------------------------------------------------------------------8
Step 1
Considering the Total Capacity of the grid tie power system that you need -----------8
Step 2 r --------------------9
Step 3 Selecting Accessory for Grid Tie Power System installation ------------------------------10
Step 4 ---------------------------------11
Step 5 - Installing Solar Panels to suitable place ------------------------------------------------------13
Step 6 - -----------------------------------13
Step 7 - --------13
Step 8 –
Grounding the system -----------------------------------------------------------------------------13
Step 9 – Connecting the PV modules after complete from Step1 to Step8 ---------------------13
Installing larger capacity of grid tie power system----------------------------------------------------------------16
---------------------------------18
Starting DIY from small Grid Tie System---------------------------------------------------------------------------19
Table of Contents 2

SR-1000-G-H-U 1000W / 900W
SR-300-G-M-U
SR-300-G-L-USR-300-G-L-U
SR-250-G-L-E
SR-250-G-L-U
Table 1, SR-G Grid Tie Inverter Models
of all models, refer to our website
SR-G grid tie inverters include a series of models, refer to
SR-G Grid Tie Inverter Models
table 1. For more information
3
Model Number
Rated Power
(Peak/Continuous)
AC Output
Voltage Range
AC Output
Frequency Range
Peak Inverter
Efficiency
Night
Power Consumption
250W / 225W
250W / 225W
DC Input
Voltage
500W / 450W
500W / 450W
600W / 540W
600W /540W
10.8V~30V 90V~140V 46Hz~65Hz
90V~140V 46Hz~65Hz
190V~260V 46Hz~65Hz
190V~260V 46Hz~65Hz
90V~140V 46Hz~65Hz
90V~140V 46Hz~65Hz
90V~140V 46Hz~65Hz
90V~140V 46Hz~65Hz
90V~140V 46Hz~65Hz
90V~140V 46Hz~65Hz
190V~260V 46Hz~65Hz
190V~260V 46Hz~65Hz
90V~140V 46Hz~65Hz
190V~260V 46Hz~65Hz
90V~140V 46Hz~65Hz
190V~260V 46Hz~65Hz
22V~60V
250W / 225W
250W / 225W
10.8V~30V 190V~260V 46Hz~65Hz
190V~260V 46Hz~65Hz
90%
91%
90%
91%
0.1W
0.1W
0.1W
0.1W
0.1W
0.1W
0.1W
0.1W
0.2W
0.2W
0.2W
0.2W
0.2W
0.2W
0.2W
0.2W
0.5W
1.5W
0.5W
1.5W
1.5W
1.5W
1.5W
1.5W
90%
91%
90%
91%
90%
91%
90%
91%
90%
91%
90%
91%
90%
92%
90%
92%
92%
92%
92%
92%
22V~60V
22V~60V
22V~60V
10.8V~30V
300W / 270W 90V~140V 46Hz~65Hz
90V~140V 46Hz~65Hz22V~60V
10.8V~30V
10.8V~30V
500W / 450W
500W / 450W
190V~260V 46Hz~65Hz
190V~260V 46Hz~65Hz22V~60V
10.8V~30V
22V~60V
10.8V~30V
600W / 540W
600W /540W
190V~260V 46Hz~65Hz
190V~260V 46Hz~65Hz22V~60V
10.8V~30V
22V~60V
45V~90V
22V~60V
45V~90V
45V~90V
45V~90V
45V~90V
45V~90V
SR-250-G-L-U
SR-250-G-M-U
SR-250-G-M-E
SR-250-G-L-E
300W/270W
300W/270W
SR-300-G-L-U
SR-300-G-M-U 300W/270W
SR-300-G-L-E
SR-300-G-M-E
SR-500-G-L-U
SR-500-G-M-U
SR-500-G-L-E
SR-500-G-M-E
SR-600-G-L-U
SR-600-G-M-U
SR-600-G-L-E
SR-600-G-M-E
SR-1000-G-M-U 1000W / 900W
SR-1000-G-M-E 1000W / 900W
SR-1000-G-H-U 1000W/900W
SR-1000-G-H-E 1000W/900W
SR-1500-G-H-U 1500W/1450W
SR-1500-G-H-E 1500W/1450W
SR-2000-G-H-U 2000W/1850W
SR-2000-G-H-E 2000W/1850W

tionary markings in the technical description and on the SR-G Seri
replacement process. Tampering with or opening the SR-G Series Grid
ease read all instructions and cau-
Before installing or using the SR-G Series Grid Tie Inverter, pl
- Do not attempt to repair the SR-G Series Grid Tie Inverter; i
d/or replace SR-G Series Grid Tie
Be aware that the body of the SR-G Series Grid Tie
SR-G Series Grid Tie Inverter, the following safety symbols appear
SR-G Series Grid Tie Inverter.
YYSR-XXX-G-X-X
If it failed, please contact Our customer service to obtain
Important Safety Information
Safety Instructions 4
Read this First !
This manual contains important instructions to follow during installation and maintenance of
To reduce the risk of electrical shock, and to ensure the safe installation and operation of the
throughout this document to
indicate dangerous conditions and important safety instructions.
WARNING! This indicates a situation where failure to follow instructions may be a safety
hazard or cause equipment malfunction. Use extreme caution and follow instructions
carefully.
NOTE: This indicates information particularly important for optimal system operation.
Follow instructions closely.
WARNING!
Inverters is the heat sink and can
reach a temperature of 80
℃
under extreme conditions. To reduce risk of burns, do not touch.
- Perform all electrical installations in accordance with all local electrical codes and the
National Electrical Code.
- Be aware that only qualified personnel should install an
Inverters.
t contains no user serviceable
parts.
a RMA number and start the
Tie Inverter will void the
warranty.
es Grid Tie Inverter and the
PV-array.
Model Name description:
AC Output Voltage Range, “U” is 90V~140V, “E” is 190V~260V
DC Input Voltage Range, “L” is 10.8V~30V, “M” is 22V~60V, “H” is 45V~90V
“G” is Abbreviation of Grid Tie Power Inverter
The Rated Output Power
The Title Name of Products

A Small Grid Tie Power System with the SR-G Grid Tie Inverter
tion of the SR-G Grid Tie Inverter.
SR-G Grid Tie Power Inverter is the world
Introduction of SR-G Grid Tie Inverter
5
’s most technologically advanced inverter for
use in utility-interactive applications. This manual details the safe installation and opera-
This integrated system maximizes energy harvest, increases system reliability, and
implifies design, installation and management.
The small type solar grid tie power inverter can obtain the solar energy from solar panel, and
can tie to the grid through its output cables with no extra equipment. The installation is very
convenient and reliable.
We call the system combining with small solar grid tie inverter and solar panels as ‘SGPV’. The
system includes solar panels and small type grid tie inverter and installation kit. Solar panels
can be mono silicon, polygon silicon, non-crystal film or any other material that can transform
solar energy to electric energy. The power of grid tie inverter should be matched to the power
of solar panels connected. So the power of SGPV is defined by its solar panels, it can be
standardization according to the actual using.
The inverter can be connected to any outlets of utility grid at house. The small grid tie inverter
monitors the volume, frequency and phase of the home utility grid, then produce pure sine
wave AC power that the frequency and phase are as same as the grid's, and the volume is a
bit higher than the grid's, then according to the current controlled PWM, to control the output
power to the grid. The small grid tie inverter just puts out power when the home grid is on.
When the sun shines, the PV panel will produces DC voltage, and the grid tie inverter will
change the DC voltage to AC voltage and puts out power to the home grid. When the total
power of electric apparatus that are using in the house is larger than the output power of the
inverters, these power from the inverters will be consumed in the house, this will slow down
the power meter, otherwise, the difference of the output power of the inverter between the
total used power of the apparatus will go out from the house to the out grid.
Fig 1.

Advantage of The SR-G Grid Tie Power System
6
There are many advantages of SGPV compare with the traditional grid tie power system.
1. Low cost and easy installation - SGPV can make full use of all types of buildings’ surface
that face to the sun in the city as well as fast and easy installation of solar modules and grid tie
inverter. It just needs very low maintenance costs.
2. Free combination - SGPV can be used as a separate grid tie system and can be setup as a
large solar array with many of them. The quantity of SGPV in the array is just according to your
desire. If you are planning to install a grid-tie PV system, in a general way, the solar array and
inverter need to be carefully matched to ensure that the inverter’s voltage and power limits are
not exceeded. When you want to increase more solar panels, and if the total power of the solar
panels exceeds the allocation grid inverter, it is necessary to increase the cost of a grid
inverter.
3. Combination of SGPV does not interact - The traditional solar grid tie system, they offer
units ranging in high power output and these units are modular so you can have multiple units
operating in parallel for large solar arrays. Although, the traditional grid inverter has MPPT
feature (Maximum Power Point Tracking), but the maximum power point is according to the
entire series in terms of solar panels array, if the performance of a piece of solar panels in the
system, for some reason, such as leaves, bird droppings, dust, shadow, etc. and degrades,
the performance of the entire solar power system will decrease.
SGPV has no such disadvantage. If the performance of a piece of solar panels in the system
degrades, this just effects this piece itself, will not affect other SGPV in the system.
4. Improving the efficiency of the entire solar power system – In traditional grid tie system, the
solar panels are connected in series, so the MPPT of the inverter is according to the total
panels in series, not to every panel, but there is difference between every panel, so not every
panel is working at the maximum power, this will reduce the total power of these panel in
series.
But SGPV has no such disadvantage. Because every inverter of SGPV has MPPT function, so
every panel is working at the maximum power, this will increase the efficiency of the entire
system.
5. Low power consumption – Most of the parts in the small grid-tie inverter are digital ICs and
low power MCU, so the power consumption of it is low, though the quantity of grid tie inverters
is increased, but this will not increase the power consumption much of the entire system.

SR-G Grid Tie Inverter to the
Connect the SR-G Grid Tie Inverter to the electrical utility
the user manual, on the SR-G
Before installing the SR-G Grid Tie Inverter, read all
SR-G Grid Tie Inverters.
SR-G Grid Tie Inverter Installation
Follow the instructions in this section to install
WARNING:
instructions and cautionary markings in
Grid Tie Inverter, and on the photovoltaic array.
WARNING: Perform all electrical installations in accordance with all local
electrical codes and the National Electrical Code (NEC)
WARNING:
grid only after receiving prior approval from the utility company.
WARNING: Be aware that only qualified personnel should connect the
electrical utility grid.
WARNING: Be aware that installation of this equipment includes risk of
electric shock. Normally grounded conductors may be ungrounded and
energized when a ground fault is indicated.
WARNING:This unit is provided with fixed trip limits and shall not be
aggregated above 30 kW on a single Point of Common Connection
7

DO NOT connect SR-G Grid Tie Inverters to the utility grid or
9. Completing SR-G installation map and
7. Connecting SR-G Grid Tie Power System with
6. Installing SR-G Grid Tie Inverter to sui
4. Selecting correct model of SR-G Grid Tie I
2. Choosing applicable solar panels for SR-G Grid Tie Inverter.
Installing SR-G Grid Tie Power System involves several key
8Installation Procedure
steps:
1. Considering the total capacity of the grid tie power system that you need.
3. Selecting accessory for installation of the Grid Tie Power System .
nverter.
5. Installing solar panels to suitable place.
table place.
cables and connectors.
8. Grounding the system.
Connecting the PV modules.
Each of the detailed installation steps in the following sections is numerically
referenced in the installation diagram below.
WARNING:
energize the AC circuit(s) until you have completed all of the installation
Step1. Considering the total capacity of the grid tie power system that you need.
The total capacity of the whole grid tie power system is according to your power
consumption in the site that you want to install, or how much power that you want it to feed
to the utility grid. Actually, the volume is just according to your willingness, because when
the total power of electric appliances that are being used in the installation site is larger
than the output power of the grid tie power system, these power from the system will be
consumed in the site, this will slow down the power meter, otherwise, the difference of the
output power from the system between the total used power of the appliances will feed to
the utility grid.
For example, if you want to install a grid tie power system in your house, you could decide
the total power volume according to the total power the appliances that you use in your
house, maybe the consumption of total energy in per day is about 5KWH, then you should
realize the real irradiation time in per day at your site, actually the real irradiation time is an
average result, because it will vary every day according to the climate, just assume the
time is 6 hours, so you can install a 1KW grid tie power system, with this capacity of the
system,it can supply all power consumption in whole year.
When grid tie power system is working, sometimes, there is extra power feed to utility grid
if the power from the grid tie system is larger than the power consumed by the appliances
in your house, and sometimes will not when it is not larger.
Of course, you can install 500W grid tie power system or 2KW grid tie inverter, even more
large capacity or more small capacity grid tie inverter, it doesn’t matter. But if the capacity
is too big, you should consider the volume of AC system of your house can hold the feeded
power.

Choosing applicable solar panels for SR-G Grid Tie Inverter.
9Step2.
Descripiton of Solar Panel
Solar panel is an array of solar cells, it is an electrical device that converts the energy
of light directly into electricity by the photovoltaic effect. when exposed to light, it can
generate and support an electric current without being attached to any external voltage
source.
Most solar panels consist of solar cells conected in serial. Recently, main solar cells
have two types, Mono and Poly, their performance are almost same.
The main technical data of solar panel including Efficiency, Pmax, Vmp, Imp, Voc, Isc,
etc. For example, the specifications of one type 245W solar panels consist of 60 PCS
156×156 Poly solar cells are shown below.
Module Efficiency: 14.8% Pmax: 245W
Vmp: 29.4V Imp: 8.34A
Voc: 36.9V Isc: 8.68A
Note: These specifications are under Standard Test Conditions(STC).
STC: Irradiance 1000W/m2, Cell temerature 25℃
, Air mass AM1.5 according to
EN60904-3.
Module Efficiency is the converting efficiency that the module converts the energy of
light into electricity power.
Pmax is the Maximum Power of solar panels.
Vmp is the Rated Voltage at Pmax.
Imp is the Rated Current at Pmax.
Voc is the Open Circuit Voltage.
Isc is the Short Circuit Current.
Because these specifications are under STC, these specifications also are sensitive
with temperature of surroundings, so should consider the vary of these specification with
temperature. Please check the curves of I-V and Temperature Dependence of Isc, Voc,
Pmax.

10Fig 2. I-V Curves Fig 3. Temperature Dependence of Isc, Voc, Pmax
The I-V Curves shown in the Fig. 2 is a solar panel’s I-V curves that the power is 230W.
You can get the information from this I-V curves that different irradiance under sunshine
will get different power from same solar panel, and also different power will be converted
under same irradiance but the output of DC voltage is different, the solar panel just can get
maximum power at one point under a certain irradiance, this point is called maximum
power point(MPP). The MPP also is sensitive with temperature of surroundings.
The temperature dependence of Isc, Voc, Pmax shown in the Fig. 3. You can see that the
Pmax and Voc have negative temperature character, Vmp also has same character.
Choosing solar panels
The most important specifications when selecting solar panels are Pmax,Voc, Vmp and
Isc.
1, The total Pmax of solar panels should be equal to or less than the Rated Power(Peak)
of the inverter that you will connect.
2, The total Voc of solar panels should be less than the maximum point of the DC input
range of the inverter, it is according to the connecting method, if you connect solar panels
in parallel, all panels must have same Voc, the Pmax of each panel can be different or
same, so the total Voc is as same as one Voc, but if you connect solar panels in serial, the
Isc of each solar panel must be same, the Pmax of each panel can be different or same,
so the total Voc is the summation of all solar panels connected in serial. Connecting solar
panels with same specifications in a single system is the best choice.
3, The total Vmp of solar panels should above the minimum point of the DC input range of
the inverter. The connecting method principle is as same as item 2 above.
Step3. Selecting Accessory for Grid Tie Power System installation.
The accessory for grid tie power system including:
1, DC cables will be connected with solar panels and inverters.
2, Connectors.
3, AC cables.
4, Power meter(Optional).
5, Bracket for solar panels installation(not included in this user manual).

Selecting Correct Model of SR-G Grid Tie Inverter.
11
Selecting DC cables
Before you connect the solar panels to inverter, suitable specification of cables should be
selected. The selection of specifications of the cables is according to the total power of the
solar panels and the connecting method of solar panels.
You should calculate the maximum current that will transit through the cables, we mark it as
Imax. First, calculate the total Pmax of the solar panels that will be consisted of the grid tie
power system, we mark it as TPmax, then calculate the total Vmp of them, we mark it as
TVmp, we also can get total Imp, mark it as TImp, with this, we can get the TImax using a
formula (1) or (2) shown below.
TImp = TPmax/TVmp ------ (1)
or TImp = Imp×N ------ (2) N is the parallel number of solar panels
After finish the calculation of Imax, then we can pick suitable cables according to Table 2.
It’s the best that you choose solar cables for outdoor use.
Selecting Connectors
When installing the SGPV system, maybe you should use some connectors for connecting
solar panels and inverter. Most of these connectors are shown as below.
MC4 Connectors Connectors for parallel connecting
Selecting AC cables
AC cables will be supplied with inverters by our factory, different countries will be supplied
different type AC cables, according to the standard of the area. You should provide the
information to the dealer where you will install the system.
Step4.
When finished step1 to step3, and decided the connecting method of the solar panels,
then you can select a correct model of inverter. The input DC voltage range of the
inverter should fit the DC output voltage of the solar panel array, the rated power of the
inverter should also fit the total power of the solar panel array, and the AC output of the
inverter should fit the standard of AC utility grid.

12AWG Diameter Diameter Area Resistance Resistance Max Current Max Frequency
[inches] [mm] [mm2] [Ohms /1000 ft] [Ohms/ km] [Amperes] for 100% skin depth
0 (1/0) 0.3249 8.25246 53.5 0.0983 0.322424 150 250 Hz
1 0.2893 7.34822 42.4 0.1239 0.406392 119 325 Hz
2 0.2576 6.54304 33.6 0.1563 0.512664 94 410 Hz
3 0.2294 5.82676 26.7 0.197 0.64616 75 500 Hz
4 0.2043 5.18922 21.2 0.2485 0.81508 60 650 Hz
5 0.1819 4.62026 16.8 0.3133 1.027624 47 810 Hz
6 0.162 4.1148 13.3 0.3951 1.295928 37 1100 Hz
7 0.1443 3.66522 10.5 0.4982 1.634096 30 1300 Hz
8 0.1285 3.2639 8.37 0.6282 2.060496 24 1650 Hz
9 0.1144 2.90576 6.63 0.7921 2.598088 19 2050 Hz
10 0.1019 2.58826 5.26 0.9989 3.276392 15 2600 Hz
11 0.0907 2.30378 4.17 1.26 4.1328 12 3200 Hz
12 0.0808 2.05232 3.31 1.588 5.20864 9.3 4150 Hz
13 0.072 1.8288 2.62 2.003 6.56984 7.4 5300 Hz
14 0.0641 1.62814 2.08 2.525 8.282 5.9 6700 Hz
15 0.0571 1.45034 1.65 3.184 10.44352 4.7 8250 Hz
16 0.0508 1.29032 1.31 4.016 13.17248 3.7 11 k Hz
17 0.0453 1.15062 1.04 5.064 16.60992 2.9 13 k Hz
18 0.0403 1.02362 0.823 6.385 20.9428 2.3 17 kHz
19 0.0359 0.91186 0.653 8.051 26.40728 1.8 21 kHz
20 0.032 0.8128 0.518 10.15 33.292 1.5 27 kHz
21 0.0285 0.7239 0.41 12.8 41.984 1.2 33 kHz
22 0.0254 0.64516 0.326 16.14 52.9392 0.92 42 kHz
23 0.0226 0.57404 0.258 20.36 66.7808 0.729 53 kHz
24 0.0201 0.51054 0.205 25.67 84.1976 0.577 68 kHz
25 0.0179 0.45466 0.162 32.37 106.1736 0.457 85 kHz
26 0.0159 0.40386 0.129 40.81 133.8568 0.361 107 kHz
27 0.0142 0.36068 0.102 51.47 168.8216 0.288 130 kHz
28 0.0126 0.32004 0.081 64.9 212.872 0.226 170 kHz
29 0.0113 0.28702 0.0642 81.83 268.4024 0.182 210 kHz
30 0.01 0.254 0.0509 103.2 338.496 0.142 270 kHz
31 0.0089 0.22606 0.0404 130.1 426.728 0.113 340 kHz
32 0.008 0.2032 0.032 164.1 538.248 0.091 430 kHz
33 0.0071 0.18034 0.0254 206.9 678.632 0.072 540 kHz
34 0.0063 0.16002 0.0201 260.9 855.752 0.056 690 kHz
35 0.0056 0.14224 0.016 329 1079.12 0.044 870 kHz
36 0.005 0.127 0.0127 414.8 1360 0.035 1100 kHz
37 0.0045 0.1143 0.01 523.1 1715 0.0289 1350 kHz
38 0.004 0.1016 0.00797 659.6 2163 0.0228 1750 kHz
39 0.0035 0.0889 0.00632 831.8 2728 0.0175 2250 kHz
40 0.0031 0.07874 0.00501 1049 3440 0.0137 2900 kHz
Table 2: American Wire Gauge (AWG) Cables / Conductor Sizes and Properties

Connecting the SR-G Tie Power System with Cables and Connectors
the inverter to the surface, because some models of SR series grid
Place theSR-G Grid Tie Inverter on a surface protected from direct
Installing SR-G Grid Tie Inverter to suitable place.
and connectors to integrate the Small Grid Tie System.
13Step5. Installing Solar Panels to suitable place.
Installing the solar panels of the SGPV to suitable location that sunshine can irradiate on
them, there must have no shadow, the installation direction of the solar panels should be
according to the geography position that the system will be installed, different position should
has different installation direction, the principle is to get maximum irradation in all the year
round.
Warning: Ensure that there is no shadow at the location that solar panels will be installed,
because even the shadow just covers only one cell of solar panel, maybe will cause total
system stop to produce power.
Warning: Ensure using strong braket to fix the solar panels to avoid the danger under
high wind.
Step6.
sunlight, high
temperatures, and water. The inverter requires at least 150mm of clearance around itself for
ventilation. The inverters are for indoor use, can’t use at outdoor. You can use screws to fix
tie inverter have fans on
the bottom cover, so the surface should be flat.
Step7.
After finished from Step1 to Step6, you should connect the solar panels and inverters with cables
Step8. Grounding the system.
Route a continuous GEC through each of the solar panels to the NEC approved AC grounding
electrode. The racking and module could be grounded to this conductor using a crimp
connection. An alternative method would be to connect the grid tie inverters to the grounded
racking using a grounding washer approved for the racking. The ground wire of the AC cables
is connnected to the housing of inverter when the AC cables is connected to the inverters, so
when the AC plug is inserted to the socket of AC outlet of utility grid in the house, the ground pin
of the socket must be connected to the Earth ground.
Step9. Connecting the PV modules after complete from Step1 to Step8.
Warning: If you will connect the PV modules to the inverter under sunshine, you should cover
the modules with no transparent material like black cloth, if the modules have been connected in
serial, just cover one module, actually, just need to cover one cell of the module, but if the
modules have been connected in parallel, you should cover one module of every branch, also
just need to cover one cell when you cover a module.
Covering the modules under sunshine just in order to avoid the sparkle when connect the cables.
：

from these solar panels, it is suitable for 1KW SR-1000-G model i
Because we should connect 4 PCS solar panels to SR-G Grid Tie Inve
As we stated at Step1, we can get a result that a 1kW SR-G G
14Example of Installation of 1KW grid tie power system
In order to explain the installing operation, we assume that there is a house that the usual
electricity consumption is about 5KWH per day, and the real irradiation time is about 5
hours.
1, Considering the total capacity of the grid tie power system that you need.
rid Tie Power System is
suitable for this house, so we will establish a 1KW gird tie power system step by step, we
also assume that we will install the system in the house where the utility grid is 230V/50Hz.
2, Choosing applicables Solar Panels.
Because the most popular solar panels are 240Wp~250Wp poly panels with 60 PCS solar
cells, so choosing this kind type panels will be more economical. The system is 1KW power
system, so we should use 4 PCS 240Wp to 250Wp solar panels.
Most of this kind type solar panels have similar specification shown below.
Module Efficiency:14.8% Pmax:245W
Vmp:29.4V Imp:8.34A
Voc:36.9V Isc:8.68A
so use 4 PCS of this type panels, we can get total power:
TPmax = 245Wp×4 = 980Wp
nverter.
Notes: The Pmax specification of solar panel is under STC, the actual power is variational
according to the irradiation on the panel and the temperature surroundings. The real output
power can’t reach Pmax at most time in whole day.
3,Selecting Accessory for Grid Tie Power System installation.
rter, so some
connectors are necessary. Consider of the Voc, Vmp and Isc, we choose some MC4
connectors and some connectors for parallel connecting.
For the choice of DC cables, we should consider about the connecting method of solar panels,
there are two methods can be choosed.
Method 1: Connecting the 4 panels in parallel, so the maximum DC current will be
TImp = TPmax/TVmp = 980W/29.4V = 33.3A or
TImp = Imp × 4 = 8.34A × 4 = 33.3A
According to the Table 2, AWG6 Cables should be choosed.
Method 2：Connecting 2 panels in serial consist as a pair, so 4 panels can be gotten 2 pairs,
TImp = TPmax/TVmp = 980W/58.8V = 16.7A or
TImp = Imp × 2 = 8.34A × 2 = 16.7A
So according to the Table 2, AWG9 cables should be choosed.
Because the DC cables will be more expensive if the diameter is big, considering about this
matter, the method that can use smaller diameter cables will be a good choice.

SR-1000-G-M-E
Fig. 4 1KW SR-G Grid Tie Power System Connected With Method
From these specification, we should to use SR-1000-G-M-E. This is be
From these specifications, we should to use SR-1000-G-H-E. This is b
4, Selecting correct model of SR-G Grid Power Inverter.
nels to Small Grid
151
Because maybe there will be several methods of connecting solar pa
Tie Inverter, different connecting method maybe should use different model inverter. In this
case, there are two connecting methods.
With method 1, because all panels are connected in parallel, so we can know that the
TVoc(total Voc of the solar panels) will be same as Voc of one panel, and the TVmp also
is same as Vmp of one panel. So we can get the specifications of the solar panels array
with solar panels connected each other.
TPmax:245W×4 TVmp:29.4V
TImp:8.34A×4 TVoc:36.9V
TIsc:8.68A×4
cause, the DC input
voltage range of this model is 22V to 60V, so the TVoc and TVmp is in the DC input voltage
range
With method 2, we also can get the specifications of the solar panels array.
TPmax:245W×4 TVmp:29.4V×2
TImp:8.34A×2 TVoc:36.9V×2
TIsc:8.68A×2
ecause, the DC
input voltage range of this model is 45V to 90V, so the TVoc and TVmp is in the DC input
voltage range.
The two connecting method diagrams are shown in Fig.4 and Fig.5 below.
DC Input Panel
AC Output Panel
4 × 245Wp Solar Panels
Connected in parallel
Outlet of Utility Grid

SR-1000-G-H-E
Fig. 5 1KW SR-G Grid Tie Power System Connected With Method
162
Comparing the connected method in Fig.4 and Fig5, we can see that method 2 is the good
choice, because with method 1, the DC cables is more thick, so it is more expensive, and
three pairs of connectors for parallel connecting plus three pairs of MC4 connectors should
be used.
But with method 2, the DC cables is thin, and just a pair of connectors for parallel connecting
and a pair of MC4 connector should be used.
Installing larger capacity of grid tie power system.
Sometimes, maybe you are willing to install larger capacity of grid tie inverter in your house,
this is also very easy to operate. For example, you want to install 2KW grid tie power system,
you can install two 1KW grid tie power systems as shown in Fig.5, two AC output cables
should be all connected to the AC outlet of the utility grid with the plugs.
The diagram of the 2KW grid tie system with two 1KW sytem are shown in Fig. 6, we call this
kind system as “Stackable System”.
DC Input Panel AC Output Panel
4 × 245Wp Solar Panels
2 Panels Connected in Serial
Constitudes a Pair of Panel
2 Pairs Connected in Parallel
Outlet of Utility Grid

SR-1000-G-H-E
SR-1000-G-H-E
SR-1000-G-M-E
SR-1000-G-M-E
Don’t Connect the DC input Terminals of one SR-G Grid Ti
174 × 245Wp Solar Panels
2 Panels Connected in Serial
Constitudes a Pair of Panel
2 Pair Connected in Parallel
4 × 245Wp Solar Panels
2 Panels Connected in Serial
Constitudes a Pair of Panel
2 Pair Connected in Parallel
Fig.6 2KW Grid Tie Power System Consist of Two 1KW Grid Tie Power System Stacked
WARNING: e Power
Inverter to another’s. If so, neither of the inverters can find the correct maximum power
point(MPP), this will reduce the efficiency of the system. Shown in Fig.7.
Solar Panel Array
×
Fig.7 Error Connecting of DC Input Terminals
You can install any capacity of grid tie power system by stack small grid tie power systems.
For example, if you want to install 12KW grid tie power system, there are many choices, you
can stack six 2KW grid tie power systems, or twelve 1KW gird tie systems, or stack
twenty-four 500W grid tie power systems, or stack fourty-eight 250W grid tie power system,
even you can mix different capacity grid tie power systems to gain large capacity system.

In this section, we will explain how to install SR-G Po
Installing Small Grid Tie Power System to Three Phases to Utility Grid.
18
When the Capacity of Gird Tie Power System is larger, intall all the power system to one
phase of the utility grid is not reasonable, maybe this will cause unbanlance of the three
phase of the utility grid.
wer System to three phases utility
grid seperately in order to balance the fed power.
A/B/C: 3 phases
N: Neutral
G: Ground
A
B
C
G
N
Fig.8 Three Phases Grid Tie Power System

system with a SR-250-G grid tie
SR-250-G-X-X
panels to connect with SR-250-G inverter.
The smallest power of SR-G series grid tie power inverter is SR-250-G
19
Starting DIY from small grid tie power system.
If you never have experience of installing grid tie power system before, you can start DIY(do
it by yourself) from small grid tie power system.
, this is a small power
inverter that the rated output power is 225W, and the peak power can reach 250W, so you
can establish a small capacity grid tie power system with this model inverter and a big solar
panel or two smaller solar panels, the total Pmax of solar panels should be less than 250Wp.
it’s very easy to install this kind small system, just need DC cables and few connectors to
connect the system. For example, you can choose a 245Wp solar panel or two 120Wp solar
For example, installing a 3KW grid tie power system to three phase utility grid.
The diagram is shown in Fig. 8, we seperate 3KW power sytem to three power system units,
every unit has 1KW power. Connecting every system unit to different phase, this can
balance all grid tie power to three phases of the utility grid.
Fllow this way, you can install more large grid tie power system to three phases, just
seperate the whole power system to three equal power system units.
250Wp Solar Panel
DC Input Panel AC Output Panel
Installing a 250W gird tie power
power inverter and a 250Wp solar
panel.
Fig.9 250W grid tie power system with one solar panel
Outlet of Utility Grid

Fig. 11 SR-250-G-X-X,SR-300-G-X-X Layout
SR-250-G-X-X and SR-300G-X-X have same layout, please see the
Layout of SR-G Grid Tie Power Inverter
SR-250-G-X-X
20DC Input Panel AC Output Panel
2×120Wp Solar Panel
Outlet of Utility Grid
Installing a 250W gird tie power
system with a TY-250-G grid tie
power inverter and two 125Wp
solar panels.
Fig.10 250W grid tie power system with two solar panels
It doesn’t matter that you connect small power solar panels like 60Wp, 85Wp or other power
to the inverter, the specification of total panels must meet the specification that you choose
according to the principle that mentioned in this user manual .
Fig. 11.
DC Input Panel
AC Output Panel
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