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
255w Panel Voc = 37.4 Vmp = 30.2
But in the sun, the panel Voc drops to 34ish. So if on and off happen to be equal time at that stage of Absorb, you would see about
32v as the input voltage IF Vmp were the on- time voltage.
When the batts are near full, average input voltage would be near that 34 as seen on your meter.
I have watched Vmp in Bulk during a test that showed it climbed as the batteries charged up. Vmp started at 29.0, and reached 31.1 when it maxed out (during an attempt to get 24v batts above 30v with a 60 cell panel--30.3v was highest it got the batts.)
So since it does track, Vmp is not a fixed amount, but has a range. This would make it hard to get the average voltage between Voc (as it is with panel in the sun) and a moving Vmp. It is not a voltage they try for I guess, just whatever it comes out at that you see on your meter which can't keep up with the switching, so you see a sort of average.
But in the sun, the panel Voc drops to 34ish. So if on and off happen to be equal time at that stage of Absorb, you would see about
32v as the input voltage IF Vmp were the on- time voltage.
When the batts are near full, average input voltage would be near that 34 as seen on your meter.
I have watched Vmp in Bulk during a test that showed it climbed as the batteries charged up. Vmp started at 29.0, and reached 31.1 when it maxed out (during an attempt to get 24v batts above 30v with a 60 cell panel--30.3v was highest it got the batts.)
So since it does track, Vmp is not a fixed amount, but has a range. This would make it hard to get the average voltage between Voc (as it is with panel in the sun) and a moving Vmp. It is not a voltage they try for I guess, just whatever it comes out at that you see on your meter which can't keep up with the switching, so you see a sort of average.
