The best photovoltaic solar panels
Thought I would share some information on what are rated as the best/most efficient panels available. Sanyo HIT Power N Series. The cells are hybrids of monocrystalline silicone, surrounded by ultr...
Forum Discussion
BFL13 wrote:red31 wrote:
Yes, ya want 10A then it would be 22v, want 22A it would be 10v.
But you don't get to pick the voltage, the controller output is that of the batt so 220/12.5 = xxA latter in the day 220/13 = xxA
I get that for 12v and PWM but here we DO get to pick the voltage.
You can pick 36v or 39v for your Vmp depending on which panel you choose. Both are 220w.
At battery voltage (rising but right now at) 13v, is the MPPT charging at the same amps?
No at the battery v*a has to stay the same, so as the volts rise the amps drop. That is why MPPT has the biggest gains on the most deeply discharged batteries. They are running the solar panels farthest away from their most efficient voltage on PWM. As the battery voltage gets closer to the panel's V(mpp), the MPPT advantage drops. If due to high temps the panel's adjusted V(mpp) drops to the battery voltage, at that point (actually somewhere shortly before that point) PWM becomes more efficient than MPPT.
Jim
