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Thoughts on small off grid design

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  • Thoughts on small off grid design

    I purchased a 280 watt panel, combiner box, and linear current booster to run a 12 volt motor. I'm thinking I want to go ahead and upgrade to a small battery backup system for my home. Attached is a diagram of what I have now and what "I think" I should do to expand. Basically, I what to build a bigger array to run my motor and charge batteries. I'd really appreciate any input. I'm a total new guy so please don't hesitate to tell me if my design is going to burn my house down! Thanks! See attachment
    Attached Files

  • #2
    I would use the 3rd graphic, but wire the panels in series, and use a MPPT controller for a 24V battery system (2, 12V batteries in series) it will have less losses than a 12V system.
    Powerfab top of pole PV mount (2) | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
    || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
    || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

    solar: http://tinyurl.com/LMR-Solar
    gen: http://tinyurl.com/LMR-Lister

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    • #3
      I'd have to agree with Mike. There's just too much change of the LCB and Charge controller not playing nicely to try proposal 1.

      Depending on what your 12v motor is used for there is a 3rd possibility. What's the motor used for? Does it have some kind of switch to turn it off when not required? something like a float switch in a cistern?

      WWW

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      • #4
        Thanks guys

        Yes there is a switch and at first I didn't think I'd ever use both sides at the same time...but as i think about it I probably will. The motor is used to run a deep well piston pump. My questions are:

        1. How would I split the power coming from the combiner?
        2. Would the motor run much better on 3 panels instead of 1?

        Thanks so much!

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