DIY PV System -- Sizing the Components


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There is really not much to "size" on this system.


The wiring that runs from the PV array to the house power distribution panel should be sized to keep a low voltage drop.


This Application note for the 190watt inverter provides a table for choosing the gage of the wire from the array to the house:


In my case with 10 inverters and a 90 ft run, I could have used #12 wire (good for up to 115 ft with 10 inverters), but I decided to use #10 to allow for adding a few more panels at some future date.


Ephase allows up to 15 inverters on one circuit -- this is (15)(190w/inverter) = 2850 watts.  After this, a 2nd circuit has to be added.