PWM vs MPPT Test Results
Today (blue sky, not quite to STC at this date at this latitude 49.3N but almost according to the calculator on that) I was able to run a test on my 230w panel and Eco-Worthy 20a MPPT controller. ...
Forum Discussion
pianotuna wrote:
Hi BFL13,
Converted to percentage
9.200/10.07 ~= 8.7 % more
11.85/12.74 ~= 8.7 % more
13.44/15.32 ~= 12.2 % more
14.50/16.65 ~= 12.2 % moreBFL13 wrote:
I could at last compare the amps I got with an equivalent 230w on PWM. Result was a slight MPPT advantage in amps. EG 9.2/10.07, 11.85/12.74, 13.44/15.32, and 14.50/16.65 going from am-high noon.
PT, the way I do math, 15.32-13.44 = 1.88 and 1.88/13.44= 14% more
That was with the battery voltage still up there. When I took the next set of readings at high noon, with the battery voltage knocked back down with a bunch of loads, I got that 16.65-14.50 = 2.15/14.50 = 14.8% more
Anyway, there is more of a gain when the battery voltage is lower confirming that MPPT story.
Percentages make everything look wonderful, but don't forget that 2a more all day, if it stood at 2a would be a whole 20AH more of a daily haul. That is peanuts to me, but might be significant for somebody else. That is why you can't know what is "worth it" unless you know the other fellow's situation.
I hope I got the voltage measurements that were requested for this test. No idea what anybody might make of them.
