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    I am new to the solar world, and have been trying to refine my off grid system. So here is the info:

    1. I am running a 75 watt, 110 v ac septic tank pump in a farm pond.
    2. The pump runs 24/7...I estimate the pump to use 1800 watts/day.
    2. I have three mono solar panels; (2) 100 watt panels and (1) 300 watt panel.
    3. None of the panels are connected to each other.
    4. All panels have their own PVM solar panel control charger ( (2) 20 amp with each one hooked separate to a 100 watt panel and (1) 30 amp hooked to the 300 watt panel)
    5. Each panel is hooked directly to a 75 ah deep cycle acid marine battery. 530 MCA and 425 CCA.
    6. The panels receive approximately 5-6 hours of direct sunlight each day.-I live in central Kansas
    7. The panels are located less than 3 feet from the battery and solar charge controllers.
    8. (1) 120 watt power inverter connected directly to the battery.

    The battery will not stay charged. Can I hook the inverter directly to one of the PVM's instead of the battery?

    Any help/advice is greatly appreciated!!!!

    Jeff


  • #2
    Is P V M actually P W M ?

    75W pump x 24 hrs = 1800wh consumed , no accounting for losses yet

    500w of panels, derates to 80% 400w when perfectly aimed, less if aim is not perfect

    5 hr of sun at 400 perfectly aimed watts 2,000 watts possible in pristine conditions. you consume 1800w, there is no margin and batteries will be dead daily

    You need about 2x the solar you currently have, you have to allow for off-axis sun, clouds and stuff

    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
      Yeah you need a lot of help and money.

      With a PWM controller you need:

      Panel Wattage = 1400 watts
      PWM Controller configured for 24 volt battery = 40 amps, or 80 amps @ 12 volts
      Battery Capacity at 24 volts = 375 AH, or 750 AH at 12 volts.

      With a MPPT Controller

      Panel Wattage = 1000 watts
      MPPT Controller = 40 amps at 24 volts or 80 amps @ 12 volts
      Battery Capacity at 24 volts = 375 AH or 750 AH at 12 volts. Either way a 500 pound battery.
      MSEE, PE

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      • #4
        Currently the system has worked for 2 weeks. Not sure how but it is. I am 400' from electricity, so it may be easier to scrap and go another direction. Is it possible to hook my inverter directly to the charge controller?
        Last edited by SLCRanch; 06-13-2018, 02:03 PM.

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        • #5
          Ok...I found a deal on 280 watt panels, which brings up more questions. Can I add (2) 280 watt panels to the system and wire all 5 panels together ((1) 300 watt, (2) 100 watt and (2) 280 watt panels)? If so, would you suggest that I wire them in series or in parallel? Would it be beneficial to add a second battery? If so, should they be wired in series or parallel? ANY HELP/ADVICE is APPRECIATED!!!!

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