For 4 x 250 watt solar panels (1,000 Watts) wired in series-parallel, can I eek by with an inexpensive Chinese 40A MPPT charge controller or will I need a 60A charge controller? The panel parameters are as listed here:
Voc = 36.9
Vmp = 29.8
Ioc = 9.09
Imp = 8.39
The actual manufacturer of the Chinese MPPT charge controller lists its PV max at 1,040 Watts (meaning that 4 x 250 Watt panels are OK) and its max panel open circuit voltage at 150V (meaning, as as been explained to me in a different forum thread that I must wire them 2 in series x 2 in parallel). The charge controllers rated "load current" is 20A and its rated "battery current" is 40A. But what scares me is that one retailer in the USA for this very charge controller says panel Watts should be limited to 800 max (meaning that 4 x 250 watt panels are way over the limit).
I'm not sure if forum rules would permit me to mention the specific budget Chinese mfg'd charge controller I'm considering. I will do so if it is OK and if it is relevant to coming to the correct answer.
Voc = 36.9
Vmp = 29.8
Ioc = 9.09
Imp = 8.39
The actual manufacturer of the Chinese MPPT charge controller lists its PV max at 1,040 Watts (meaning that 4 x 250 Watt panels are OK) and its max panel open circuit voltage at 150V (meaning, as as been explained to me in a different forum thread that I must wire them 2 in series x 2 in parallel). The charge controllers rated "load current" is 20A and its rated "battery current" is 40A. But what scares me is that one retailer in the USA for this very charge controller says panel Watts should be limited to 800 max (meaning that 4 x 250 watt panels are way over the limit).
I'm not sure if forum rules would permit me to mention the specific budget Chinese mfg'd charge controller I'm considering. I will do so if it is OK and if it is relevant to coming to the correct answer.
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