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.
