12v MPPT and 24v MPPT vs 24v PWM Test
Got a chance to try out comparing amps to the battery using MPPT vs PWM on a 24v battery bank and comparing those with the usual MPPT on 12v with my 230w panel. The bank is four 6s, so it was easy ...
Forum Discussion
They don't charge at Isc but a few percent less. Look at PV I-V curves. There's not much slope to the curve between 0V and 14V.
In addition, panels are rated at xx W MINIMUM. They are usually a few percent greater than their rating. That means Isc is also a few percent greater than rating. Therefore you lose a few percent at 13V but gain a few percent since the real Isc is greater than the spec Isc.
In addition, panels are rated at xx W MINIMUM. They are usually a few percent greater than their rating. That means Isc is also a few percent greater than rating. Therefore you lose a few percent at 13V but gain a few percent since the real Isc is greater than the spec Isc.
CA Traveler wrote:
BTW I've never understood or perhaps appreciated how a PWM controller can charge at Isc.
I've connected panel wires together to measure Isc. Great but guess what? Yup the voltage is 0V, so how does the battery get charged? Capacitance or inductive energy in the controller?
