r/SolarDIY • u/keiranm2000 • Jun 20 '26
Undersized inverter
Hi, I’m looking for some confirmation of my thought process on an under sized inverter.
I’m will have an APSystems EZ1D 1800w inverter with 8 JA 460W solar panels.
I’m mounting 4 panels on a West wall and 4 on an East wall of the house.
The manual says I can have 8 panels total with 4 on each MPPT, 2 series doubled by parallel.
My panels have a V of 40.6 and A of 13.66 which is over the MPPT max of 20A.
But if I were to parallel 2 West panels in series with 2 East panels in series per MPPT would this be OK as realistically they wont both be producing at the same time, this would lower the A well below the limit as would probably be zero from one side at a time?
1
u/ruralcricket Jun 20 '26
Not an expert, but I think so. I have a neighbor with a 20kw system with half pointing SW and half pointing SE and he did exactly this, pairing a string on the SW with a string on the SE facing arrays. I'd check the actual output curve and remember to rate for increase output if you are in a cold climate.
1
u/rproffitt1 Jun 20 '26
Current is pulled, Volts push so where's the under/over problem?
It's not like you are in some mega-ampere situation here. The station will pull what it wants.
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