Forum Discussion
HiTech
May 19, 2013Explorer
Potentially yes but I think I would need a little different power supply. It would have to be adjustable constant voltage, but still be able to pull down the PVs on the input as you vary the voltage like this one. The voltage jumps all around based on changes in condition and I have to rescan with the pot to find the power point, even if it is at the same voltage, with a new pot position.
With 3 out of the 11 Unisolar segments covered in building shade, the Vmpp for panel output has dropped to under 13v, to just a couple of tenths above the battery voltage. I think the fast MPPT scan times for optimizing power on partly cloudy days has some merit. I had wondered if it was just marketing hype but I can see it mattering under some conditions.
If you get the set voltage even a little too high, output plummets as the IV curve suggests. If you get the voltage a little low, you pay hardly any penalty at all.
Jim
With 3 out of the 11 Unisolar segments covered in building shade, the Vmpp for panel output has dropped to under 13v, to just a couple of tenths above the battery voltage. I think the fast MPPT scan times for optimizing power on partly cloudy days has some merit. I had wondered if it was just marketing hype but I can see it mattering under some conditions.
If you get the set voltage even a little too high, output plummets as the IV curve suggests. If you get the voltage a little low, you pay hardly any penalty at all.
Jim
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