Solar Help
I have an older Class B motorhome and have been thinking about solar. I can boondock now for 2 days before I have to recharge my 125ah battery. The only thing that draws power is the 12V fridge whic...
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That's over simplified. MPPT current is highly dependent on panel temperature and battery voltage.
The temperature coefficient of PV cells is about -0.45%/C. A 25C rise in panel temperature is not uncommon. That means a 150W panel at 50C has dropped 11% of its rated power to 133W.
PWM is more or less unaffected by heat. The panel will output the same Isc.
Sal
The temperature coefficient of PV cells is about -0.45%/C. A 25C rise in panel temperature is not uncommon. That means a 150W panel at 50C has dropped 11% of its rated power to 133W.
PWM is more or less unaffected by heat. The panel will output the same Isc.
Sal
BFL13 wrote:
Nobody tells you your expected max amps for any given wattage of panels--except me! :) here it is:-
use the same for either PWM or MPPT, they are nearly the same for this purpose:
expected amps = chosen wattage/130w x 8.2
EG, 230w/130w x 8.2 = 14.5a (jimindenver gets 15a from his with MPPT)
EG 80w/130w x 8.2= 5a (the Isc of an 80w panel and what I got with my 80w.) It works and its free! You are welcome.
