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djibi avatar image
djibi asked

PWM controller

How to you do to size correctly a PWM controller nominal current ?


Thanks

BlueSolar PWM
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markus avatar image
markus answered ·

Panel Isc (short circuit current) must not exceed PWM controllers rated current.

To be safe, give 20% margin.

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djibi avatar image djibi commented ·

but if Impp excide the rated current what will happen?

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markus avatar image markus ♦♦ djibi commented ·

Panel Impp should be lower than Panel Isc. If you exceed the Amps, it will likely damage your PWM.

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djibi avatar image djibi markus ♦♦ commented ·

and exemple I have a solar panel with Immp=8.29A and Isc=8.89A


Can I use a PWM of 10A?


for me no because : Icontroller = 1.25*8.29=10,69A is more than the 10A of rated current.


Am I right or can I accept? Or my formule of calculation is wrong?


PS:Sorry for my bad english


THANKS

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markus avatar image markus ♦♦ djibi commented ·

If you want to be safe, no. You have a 25% Margin in your calculation...

Don't use Impp for calculations, use Isc.


Nothing to be sorry for, I can understand you perfectly.

Regards,

Markus

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