Solar Panel Voc-MPPT?
Wondering if there is any relationship between measured Voc and MPPT performance with a 24v panel. My 12v panel has a Voc rating of 21.9 and Isc of 8.2, but I often see 8.2ish when Voc is only 20....
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The practical value of Isc for me is mostly for aiming the panel when setting up. It is aimed right when Isc is highest. If you can't aim your panel, then you would not be thinking of that usage.
Next is that with 12v, PWM you can get the "amount of amps" at the battery that is the same "amount of amps" as what you got for Isc (which can be any amount depending on the light and temp) Isc is your "expected amps." Rated Isc is your "expected max amps." Sometimes you can get more amps than that such as with cloud effect.
The Voc is just a curiosity. If it is low, that has no apparent relationship with how many amps you are getting at the battery. I usually see Voc at 20.3ish (rated 21.9) when getting max expected amps (rated Isc) at the battery
Now with MPPT most of that seems to be lost in a swamp of moving parts with nothing to grab onto.
Thanks for those graphs. I don't understand them, but I hope to eventually, when "the light comes on." I'm sure it will--then I will wonder why I couldn't see it before. :(
Trimetric with controller would need the controller grounded to the same ground the battery uses.
Next is that with 12v, PWM you can get the "amount of amps" at the battery that is the same "amount of amps" as what you got for Isc (which can be any amount depending on the light and temp) Isc is your "expected amps." Rated Isc is your "expected max amps." Sometimes you can get more amps than that such as with cloud effect.
The Voc is just a curiosity. If it is low, that has no apparent relationship with how many amps you are getting at the battery. I usually see Voc at 20.3ish (rated 21.9) when getting max expected amps (rated Isc) at the battery
Now with MPPT most of that seems to be lost in a swamp of moving parts with nothing to grab onto.
Thanks for those graphs. I don't understand them, but I hope to eventually, when "the light comes on." I'm sure it will--then I will wonder why I couldn't see it before. :(
Trimetric with controller would need the controller grounded to the same ground the battery uses.
