how are you able to charge 43kwh on such a small array? we have a 12 kwh setup and it recharges a 15 kwh battery in a few hours.

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duffpkg 20 hours ago | parent | next [-]

In that part of southwest there are only a handful of cloudy days per year and at a relatively low latitude.

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lnsru 20 hours ago | parent | prev [-]

What’s the charging/discharge power of your battery? Is it AC or DC coupled?

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duffpkg 19 hours ago | parent [-]

My battery is 3 separate "48v" x 280ah units in parallel. There is no grid so I am not sure what you mean by coupled. The batteries output DC to inverters which output AC. It is several years old at this point, probably the better value is in "48v" x 320ah setups now. The breakers/busbars, etc are setup for max discharge of 200A but in practice I have never gotten anywhere near that.

	▲	lnsru 7 hours ago \| parent [-]
		As electrician I install PV systems and the Chinese have nice battery+inverter combos. Inverter feeds the battery at 480V@10A DC and then the battery later delivers 3-5 kW back over the inverter. Batteries are modular and can go up to 50 kwh. 10kW rated inverter with ~10 kWp panels fully charges 10 kWh battery in couple hours and produces additional 40-50 kWh on a sunny day (southern Germany). Probably the advantage of these products is high voltage and system integration. Sadly I have no good advice for your setup.