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To the OP I'm probably posting this a little late but here's my info. My annual usage was 16.2MW. I went with a system that would generate about 80% of our total usage. System size was (34) 260w panels for a total of 8.84 KW DC, 7.6 KW AC. Just passed 3 years and have generated about 79% ( last year a lot of cloudy days). Don't plan on buying a Tesla anytime soon so additional production is probably not on my short list , yet.... Good luck.
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Yes I think the string is easier to change out ad for the reasons JPM pointed out. But all this talk of shading makes one wonder what is considered shading. Another post had mentioned an inverter that can take multiple shade points (something new). I am leaning toward string but want to be sure I am not making a mistake.Comment
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My system has major shading in the winter. I have a string inverter with dual MPPT. Having the dual MPPT helps the inverter deal with the shade better than a single MPPT string inverter. I am getting better than expected production. I have only seen one independent test of string vs. optimizers in shaded conditions and the string lost 29% compared to full sun and the optimizers lost 24%. The difference wasn't enough to convince me to consider anything other than a string inverter. If it is important to squeeze every last possible kWh out of your array then you might come up with a different conclusion.Comment
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