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That’s WARNING 4 = low battery. Not ERROR 4 = over module over temp. Have you put all 7 modules in series yet? It's the voltage. Your 4s modules are likely teetering under/over 120V, putting out over 120v when it's cooler than 25C° and less when it heats up/doesn't get hit directly by the sun's...

DC current is measured "inline" (in series) with the circuit with the typical probes of a multimeter. You can't measure it in parallel across the terminals. Be careful though, most meters I know have 10A capacity limit.

Fault 4 is "Over temperature of PV module"... unless you have an actual temp sensor hooked to the inverter ( is inverter even capable of this?), how would the inverter know it's over temp? I'm guessing by extrapolating the low voltage input of the panels.... Literally took me 1 minute to find...

Voltage is not high enough. That inverter needs minimum 120V. Since specs are close enough on the solar panels, put all 7 panels in series.

I agree that many calcs don't include the opportunity costs, which runs both ways. One needs to also count the tax rebate + earnings on it and the earnings on the yearly savings.

Ok, have some time to further explain some info on the spreadsheet. For 12 Month Cost and Consumption Sheet: This should be your actual historical consumption taken from previous bills. The more data here the better. You can use 2,3 or more years of history here. We have Southern California...

Here's a Google spreadsheet I made to help me plan my solar journey. I thought I'd share it to help with anyone contemplating installing solar. Feel Free to make a copy and play around with it. Fill out the 12 month cost and consumption first. You enter your data anywhere it is green, then...