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Calculating volts and amps of panels first connected in series and then in parallel


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Posted

I have 4 Canadian 320w panels connected. They are divided into 2 strings of 2 panels each and then connected in parallel with y-MC4 connectors. The Voc of each panel is 45v and their Imp 8amp. Am I correct in calculating their combined volts as 90 and their amps as 16? Is the 30amp of the fuse in the combiner box high enough for their current?

Posted

You are correct re the 90v / 16A... Not knowing the model, just check the MAX / PEAK current ratings re the fuse... Rather blow fuses than panels.. If your panels are peaking at 8 amp, I would personally go lower than 30A as that is almost double the peak rating. I would sooner look at around a 20A

Posted

You need to confirm the model of your panels and then find the data sheet online

In my case, I have the CS3U-355P panels

https://sicessolar.com.br/wp-content/uploads/2017/12/CSI_KuMax_CS3U-345-360-P.pdf

As per the data sheet, they have a short circuit AMP rating of 9.67A per panel. In a 2S2P config this would mean that the fuse should ideally be 20A and not higher (to be effective)

I would presume a 20A be the best fit for yours too as I doubt you will get an 18A anywhere

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