FLA Bank size for ~700W of panels?

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  • SPFycool
    Junior Member
    • Nov 2015
    • 22
    #1

    FLA Bank size for ~700W of panels?

    Hey guy's,

    So i'm planning a project on my shed this Spring to allow me to use it as a small shop. I plan to use some small power tools/chargers and maybe a 12A saw at some point, which is why i'd like to use a 24V bank rather than 12V. Planning on a 1500w/3000w peak Pure Sine inverter as well as a 40A MPPT controller.

    I have 2x365w LG panels coming to me shortly, which are almost brand new. I plan to wire them in series for ~70V. So that's roughly 700W of solar and 25+ amps. It's more than I originally planned, but I'd rather have more than not enough.

    Originally I was thinking use using 2 Trojan SCS225 in series (24v 130Ah)- http://www.trojanbattery.com/pdf/dat...ata_Sheets.pdf

    I think I would be fine if I was using just 1 panel, but using both will be pumping 25-28 amps into the bank which I fear might be too much. Should I be looking more into the 200Ah range now with the extra solar input?
    Tags: None
    • Mike90250
      Moderator
      • May 2009
      • 16020
      #2
      The battery voltage will somewhat regulate the charge amps. When flooded batteries are quite low, they can easily absorb a lot of amps. As they charge up, they self-reduce the amps, so I would think your 2 panels will be ok. Losses, panels seldom produce their nameplate power, when they heat up, you loose 15-20% . If they are not aimed perfectly, you get less power. A fixed mount will only have 20min of good aim, after that the sun has moved. The better controllers, you can program to limit output amps too.
      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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        • SPFycool
          Junior Member
          • Nov 2015
          • 22
          #3
          Ahhh. I wasnt sure how FLA regulated the input charge when the array is a bit oversized. I have experience with undersized solar and too low current for battery charging which I apparently is much more detrimental to the life of the batteries.

          I doubt I'll be going much past 20% d.o.d on this bank and the solar should quickly charge it back up even on slightly overcast days.

          Thanks for the input!

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