Is this normal or did I gamble and lose?
Saw a local listing for solar panels - 320 watt for $115 each. I bought 4. It was before lunch and the the panels were dirty, but came in at about 38 volts. The VOC is stated as 46.0 one one and 39.7 on the other three. Apparently 3 are 320 watt and 1 was a 325 watt. Took them home and cleaned them up. Upon initial voltage check, one was about 43v and the others 38-39v just holding them up by myself and trying to get a reading. There were clouds in the area however none were shading. Anyhow, I leaned them against the fence with all on a 30 degree angle (I'm located at 45 lat) and it was about 1pm with ambient air temp at 87F and panel temp at 139F. All four came in at 40.5 +/- .3 volts among them. There may have been minimal haze in the atmosphere at the time.
What happens to VOC and/or ISC as a panel gets hot? (or ages, but these do not look old)
What happens to VOC and/or ISC when some cells are partially shaded with dirt/dust?
Is something wrong with them and I simply made a bad purchase or is it normal under these conditions? I really thought the voltage would be higher once I cleaned them off.
4-Risen 320 watt in series/parallel, 4-215ah 6 volt GC2 batteries in series, Exeltech 1100 watt/24 volt inverter, Tristar 45 MPPT controller, Iota 24 volt/25 amp charger.
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