Part of a series in renewal energy technologies
brought by M/s Paavi Solar
Friends before going
into details of Roof Top Solar PV System designing and installation, we need to
understand the specification sheets of Solar Panels and its importance. Moreover,
those who are thinking of purchasing Solar Panels need to understand various specifications
of Solar Panels to make the right choice. Behind every Solar Panel Serial
Number, date of manufacture, and manufacturer details are provided to ascertain
the warranty, etc. because most of the manufacturers are giving 25 years
warranty. Apart from the above details following the electrical characteristics of the
panel is also provided.
Power Max (Pmax) – Maximum power
output of the solar panel in Watts at ideal test conditions of 1000 irradiance
(Light Intensity of 1000 watts per sq. mtrs.) at cell temp. of 25⁰C(77⁰F).
Open Circuit Voltage(
Voc) – This parameter gives us voltage across the solar panel when no load
is connected and can be measured when one put a multimeter (voltmeter ) across
the +ve and -ve terminal of the solar panel. This is the maximum voltage a the solar panel can produce under ideal test conditions and is a key specification
for designing a Solar PV System.
Short Circuit Current
(Isc) – This parameter gives us maximum current produced by a Solar Panel
under ideal test conditions when the +ve and -ve leads are short-circuited. This
current can be measured using an ammeter in series or a clip-on multimeter.
This specification is used for the selection of components of a Solar PV system.
Maximum PowerPoint
Voltage (Vmpp) – This parameter gives us the actual maximum voltage produced by a Solar The panel under ideal test conditions when the Panel is connected to an MPPT Charge
controller or inverter and power output are maximum.
Maximum PowerPoint
Current (Impp) – This parameter gives us the actual maximum current produced by a Solar The panel under ideal test conditions when the Panel is connected to MPPT Charge
controller or inverter and power output is maximum.
Module Efficiency -- This is the maximum efficiency of the Solar Panel
under ideal test conditions and required during the calculation of Solar PV
System designing.
Nominal Voltage – Some Solar
Manufacturers provide this additional specification and this is not the actual
voltage but a category like a nominal 12V solar panel will have a Voc of about 22V and a
Vmpp of about 17V. It is used to charge
a 12V battery (which is actually around 14V)
Warranty – Manufacturers warranty,
usually 25 years (conditional)
Panel Length/width,
thickness etc.
Some manufacturers
also provide above specifications under different irradiance levels.
Friends we will study
irradiance curve in next blog. -G P BOSE
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