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
red31 wrote:
they did mean Voc for OFF, no matter what voltage Voc is, there is no power open circuit, no watts, no amps! (that's why I don't like using Isc for PWM ;), no power, watts, voltage).
I had assumed it continued to track (MPPT) but now get it that it can't sweep during on/off.
EDIT--nice graphs! Hard to interpret without knowing what the sunshine was doing later in the afternoon, which effect might get mixed in with the reducing output from the battery acceptance effect by then.
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I use "Isc" because that's what I get at the battery. Take the Isc with panel disconnected. Could be any number depending on how much sun there is. Connect up, ta da!-- same amps as you got for Isc now charging the battery. I don't know what else to call it for the purists. We need a name for it.
My Eco-Worthy MPPT controller has a feature where you can check how much MPPT is doing for you :) When you do, it shows the panel amps and that is the same as panel Isc at the time. So that is handy--you can check for Isc without disconnecting. (the controller must short the panel to get that number?) My old ASC controller operated all the time by shorting the panel to do its "Low frequency PWM" on off thing.
I check for Isc to tell whether I am getting rated STC sunlight so I can then tell if I am getting the output I should be. (System check)
