Choosing applicable solar panels for SR-G Grid Tie Inverter.
9
Step2.
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/m
2
, 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.
