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Need some advice

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  • Need some advice

    I currently have a kid, 2x285w panels and 4 x6v costco golf batteries running at 12v bank. I have a cistern and well pump in cistern to pressurize big tank once per day. We have a tiny house so our uses are very little. We use 1kw per day, 20 gallons water and lots of firewood..

    I have to use a 5kw honda gen to run pump. Pump is 1/2hp franklin 110v. The problem is it draws 67a surge at start. Running amps are 10a.

    I would like to use inverter to run pump. Looked at grunfos sqflex but too much $$$$ for us.

    Want to also get rid of costco batteries and buy trojan LR16 x 4 at 24v. Would also like to buy 2 more panels.

    My questions are,

    Are trojan lr16 good choice for 24v system? Are they good batteries?
    I need an inverter for 24v, is cotek 3k or4k low freq a good choice?
    Is there a low surge pump that doesnt cost too much?
    We haul water to the cistern, we dont have a well.
    My pump is 2 wire so i dont think soft start is option.

  • #2
    How deep is the water in the well ? I assume you pump 1x a week to fill cistern? Would a kid power pump work, foot treadle pump ? And sometimes, the generator is the right tool for the job.
    As to inverters, you have to read the specs to see which can supply that 70A starting surge for 2 seconds. (8.5Kw) I doubt the 3Kw inverter can
    That will also pull 355A off the 24v battery for 2 seconds, which means proper cables will be required to prevent the inverter from an under voltage shutdown.

    I had the same choice, a $4000 pump that might take a week to replace or a $4000 inverter to run a common $200 pump.

    Well Pump Motor Specs.jpg
    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



    • #3
      Use a DC pump and Trojans are a lot better battery than Costco.
      MSEE, PE