Solar fuseing, confuseing
Were installing a Renogy 400 watt solar system on our fith wheel. We stay on our property about two months in the summer up near Canada in Washington.Anyway this is the kit I bought. Mind you I'm comp...
Forum Discussion
Ed_Gee wrote:Nope it won't be 18V panel output. Panel voltage drops with increasing panel temperature due to the sun. Combined with MPPT conversion efficiency it's basically a wash between the 2 controllers as PWM procduces full Isc amp output. His MPPT will end up operating in PWM mode. MPPT does have an advantage for cooler temperatures.CA Traveler wrote:
Doubtful that a serial or serial/parallel setup is practical but it depends... So your best option is 4 parallel panels in which case there is no MPPT advantage over a PWM CC. But you already have the MPPT CC.
Each panel should have a fuse (15A) in the combiner box. Otherwise a short could cause excessive heating from the other 3 panels.
I must take a small exception to the above comment. In full sunlight, even with parallel panel wiring, maximum voltage out of the panels will be around18 volts.....about 4 volts more than needed even for bulk charging the batteries. His MPPT charge controller will be able to convert that extra voltage into extra charge current; a PWM charge controller won't.
MPPT does have advantages for serial panels or 24V panels for a 12V battery bank.
