best low light performance
Hi, Amorphous panels are clearly the best for low light performance--but are relatively speaking huge. Does any one know if Poly or Mono are better in low light?
Forum Discussion
mena661 wrote:
For me it's only about total amp hour haul per day.
I am with you on a day that I cannot drop out of bulk charge and all the power is being consumed. If you are actually consuming every amp hour produced, it's all about amp hours. Once PWM pulsing kicks in and some of the solar output is being wasted, the number of hours charging after that matters to me as well.
And so does output at the actual temperature of the PVs, rather than output under test conditions. I think one of the reasons I'm seeing useable power much longer into the afternoon/evening shoulder is that many solar panels get hot on sunny days and drastically drop their afternoon output with that temperature rise. The Unisolars seem a lot more immune to this, so what would appear to be much more low light output in the evening is partly sustained output under higher surface temps. The effect is the same, but it is a compound cause.
Also flat mounting panels immediately makes lower light performance more important, since it shifts the whole curve down toward the lower end, except for when the sun is directly overhead, if ever.
Jim
