Panels test different than summer time

Hello everyone,
I have these panels that last summer with full sun on, tested 20v and 3.3 amps
Did the same thing couple days ago (winter) with clear sky facing sun as well
Tested 20v 1.25amps
@Photowhit ( panels alone, no load ,no battery, no charger)
Whats going on ?
I have these panels that last summer with full sun on, tested 20v and 3.3 amps
Did the same thing couple days ago (winter) with clear sky facing sun as well
Tested 20v 1.25amps
@Photowhit ( panels alone, no load ,no battery, no charger)
Whats going on ?
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[2x Flooded 6v 210ah][12v 30a 400wMax CC]
[5x 48w 15.9Vmp + 1x 100w 17Vmp]
[2x Flooded 6v 210ah][12v 30a 400wMax CC]
[5x 48w 15.9Vmp + 1x 100w 17Vmp]
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Main daytime system ~4kw panels into 2xMNClassic150 370ah 48v bank 2xOutback 3548 inverter 120v + 240v autotransformer
Night system ~1kw panels into 1xMNClassic150 700ah 12v bank morningstar 300w inverter
Low winter sun angle, any haze/smoke/clouds, and you will get reduced current (Isc is more or less proportional to the amount of sun on the panel).
If all of your identical panels are reading the same Isc current (short circuit current), then all is fine. If you have one panel that is reading 50% or less of the Isc of others measured in the same place, same angle, and same time--Then that panel (or its connections) are questionable.
-Bill
How would one find a good balance between C rate and amd wattage winter compensation
[2x Flooded 6v 210ah][12v 30a 400wMax CC]
[5x 48w 15.9Vmp + 1x 100w 17Vmp]
MPPT type controllers are more flexible--And you can over panel to a degree just fine. There are secondary issues (any electronic device running at max current gets warmer than one running at 80% of rated current--Extra heat is always a difficulty... Can cause shorter life for electronics, especially if there is poor cooling / warm closet space). Oversize array in hot summer climate in a hot garage/battery shed--Your choice...
-Bill
[2x Flooded 6v 210ah][12v 30a 400wMax CC]
[5x 48w 15.9Vmp + 1x 100w 17Vmp]