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Hi, After spending a lot of time searching, i'd like to add some batteries(15kWh) to my current 6.4KW solar system, that's been running for a bout 2 years now. Using about 60kWh per day, my system is producing about 40-45kWh daily. 16 * TrinaSolar 405W 6KW Huawei sun2000-6ktl-l1 / Hybrid Grid...