My pwm 4 100 watt 12 volt array is 66 ft on 8 awg 10% drop. Mppt puts me at 2%. I'm currently seeing 310 watts and 22 amps midday at 32c on pwm.With Mppt what should I see??
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Your question makes no sense at all, nor does the title. If you have a MPPT controller with a Voc input of at least 100 Volts, panels wired in series, using 12 AWG wire with a 1-way distance of 66 feet only looses 1% with 33 amps into a 12 volt battery.
So how in the world do you loose 10% using 8 AWG?
Let me guess, you wired your panels in parallel?MSEE, PE -
10% loss for all in parallel? Then going to 2 in series in parallel with 2 more in series, your
loss will drop to around 2.5% with MPPT. If you can tolerate the voltage of all in series, even
10 gauge will have less loss, no fuses needed. Bruce RoeComment
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What i meant to say On pwm to go 66 ft I'd need 2 awg for a 2% drop. Or I could buy a mppt controller.Comment
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Originally posted by Ho jo View PostWhat i meant to say On pwm to go 66 ft I'd need 2 awg for a 2% drop. Or I could buy a mppt controller.MSEE, PEComment
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With 4 22.5 voc panels 90 volts x 25% safety puts me at 112 volts. 150 volt cc are more expensive. If I did 2s 2p 38 volts 10.58 amps I could use a 100 volt cc and still be in the 2% volt drop. And wouldn't all in series 90 down to 12 volts compared to 38 to 12 be less efficient for the charge controller?Comment
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