Originally Posted by Thalas
All the tests I’ve seen done on shading with solar
show testers placing an item directly ON the solar
panel. In real world conditions where the boom or sail partially shade a panel, they are quite a distance away and there is still bounce light hitting each cell even when direct sunlight is blocked. What are the real world negative effects of this kind of shading in terms of output reduction? Does a partially shaded cell that is still receiving bounce light limit the electrical
production of every cell in its series (even those in direct sunlight) to the output of that shaded cell?
Before you buy, make sure you understand that there are multiple types of panels
and their pros and cons.
Mono Pro: Highest total output per unit area over the course of a day.
Mono Con: Price
and they hate shadows.
Poly Pro: Cheaper and more shadow tolerant than mono.
Poly Con: Not as good under lower light conditions, so less total output per day.
Thin Film Pro: Resist shading, more heat tolerant and more flexible.
Thin Film Con: Less efficient and not really cheap
I just installed 4 mono panels
with individual mppt
controllers. See pics and get some good insight on this thread. Mine is on the last page.
Besides the wiring
being more work
, individual controllers can be less expensive overall than bigger ones, especially if carry a spare of the bigger one. I have 4, so losing one is no big deal. Don't skimp on the wiring
and give up power from voltage drop. Keep it 3% or under.