I need help! 12v over 24v

deanerdeaner Registered Users Posts: 1
I have a 245 watt 24volt panel going to a mppt 100/30 controller  which is capable for 12v or 24v its all on one 12v battery. now before i buy my inverter im wondering should i bump my battery bank to 24v or just keep it at 12v? 


  • littleharbor2littleharbor2 Solar Expert Posts: 1,377 ✭✭✭✭
    Your 245 watt panel, if a 60 cell panel isn't a 24 volt panel. With an MPPT controller you need higher voltage anyway for the MPPT to do its magic. Either you need another panel for a 24 volt system or use what you have for a 12 volt system.

    2.1 Kw Suntech 175 mono, Classic 200, Trace SW 4024 ( 15 years old  but brand new out of sealed factory box Jan. 2015), Bogart Tri-metric, 700 ah @24 volt AGM battery bank. Plenty of Baja Sea of Cortez sunshine.

  • EstragonEstragon Registered Users Posts: 3,851 ✭✭✭✭✭
    It's generally a good idea to define & describe load needs first, then figure out the best way to meet those needs.  It isn't clear (to me, at least) from the question that an inverter is needed at all.
    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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