Adding panels

I have 400 watt of panels by 2 [800 watts] going to their own mppt controllers then to a bms onto two lithium 180 amp/hr 12 volt  batteries wired in parallel.May I add a 200 watt panel again with it own mppt controller and to the same bms  [has three connections] as the 800 watts are connected to without causing problems


  • EstragonEstragon Registered Users Posts: 4,478 ✭✭✭✭✭
    180ah x 2 = 360ah bank @12v = 4320wh, ÷ 1200w pv = ~C/3.5 charge rate (at STC, actual likely lower).  Seems to me that should work, but you should check the BMS spec.
    Main daytime system ~4kw panels into 2xMNClassic150 370ah 48v bank 2xOutback 3548 inverter 120v + 240v autotransformer
    Night system ~1kw panels into 1xMNClassic150 700ah 12v bank morningstar 300w inverter
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