offgrider
New Member
- Joined
- Jul 20, 2020
- Messages
- 65
Lets say the panels are at the perfect tilt for the time of year, and the sun is at the exact spot for the time of day, theres no clouds/fog/haze whatsoever. Would we expect to see 1000 watts of sunlight per square meter (STC) hitting the panel?
Im trying to size panels/microinverters, and its very interesting to do the math where you subtract PTC from STC on various panels, then compare the result actoss different panels. Chinese ones usually have a difference of over 100watts. I think I saw some Panasonic ones with 330wSTC and 311wPTC which seems an almost negligible difference when you consider +100w for others.
So for my project and PV/MI sizing, at about what point will a microinverter fail due to conditions where an intentionally-oversized panel actually comes across with the wattage and produces higher than PTC for some period of time?
Im trying to size panels/microinverters, and its very interesting to do the math where you subtract PTC from STC on various panels, then compare the result actoss different panels. Chinese ones usually have a difference of over 100watts. I think I saw some Panasonic ones with 330wSTC and 311wPTC which seems an almost negligible difference when you consider +100w for others.
So for my project and PV/MI sizing, at about what point will a microinverter fail due to conditions where an intentionally-oversized panel actually comes across with the wattage and produces higher than PTC for some period of time?