Lwiddis wrote:
Mike, are you trying to limit opinions? I like reading other posters thoughts.
not so, pwm can do 24v charging with '24v' panels but is very wasteful to use 24v panel for 12v charging, that is just not how to wire PWM.
PWM, use 12v panels in parallel.
Use them in series requires MPPT to harvest max energy to charge 12v batt.
So the OP has 2 x 6A panels, in parallel use 10-12A for voltage drop and since the Vmp is so high for flex panels (OP's spec is 20v Vm) then one can have 1-2v of drop, note these are not Poly/mono, these panel have a high Vm (Vmp). Vm does not drop as fast for flex panels as mono/poly with heat. My 17v Vmp panel would suffer in the heat with 2v drop, it might not be able to get to set pt voltage!
of course with a MPPT they can be used in series for 6A x 40A (Vm x 2), with MPPT any voltage drop is loss of power. Voltage drop calc can be done with 6A, half of parallel PWM.
I like the PWM Grape controller, I can check overnight min voltage from my kitchen with the controller in the garage 30 or so feet away, landscape lighting system 3 hrs/night. EPSOLAR ViewStar VS 1024 BN PWM Solar Battery Charge worked great but no Bluetooth and not available for free shipping to the local home depot.
