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Does this Wave Sign look ok to you ?

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  • #16
    Originally posted by Mike90250 View Post

    Batteries want about 10% of their capacity, as charge current. If you only take a battery down 20-30% from full, it would recharge in 3-4 hours at 10% rate.

    If you had 400ah of battery, you want 40A of charging.
    600W @ 15V charge voltage = 40A So I'd guess 400ah is the largest your PV can support in good conditions. If you have a lot of clouds, or drain the battery deeply, you need more panel.
    Thanks, that's good news then. Its a plastic solar shed / shack so I will only be sleeping in it when my wife says so - lol.
    Cheers, I will start saving the pennies.

    My current batteries were rescue batteries so they don't last long when there is no sun.

    I hope to never go below 50%, so will get a few of them and over provision. It will be an ad-hock affair I think.

    I think I want AGM, as I read they are low resistance and maintenance free, and I wanted a high capacity battery so I don't have to parallel too many to get what I want.

    The shack panels are facing west, so only get afternoon/evening sun, but they don't suffer from shading, and I have the capacity to add the same again on the east side to get the morning sun. It's a case of working with what I have, and making the best I can.

    At the moment my entire load is less than 500W, but that will increase I would imagine, FWIW I only use the shack during the day, and everything is off at night, and would likely only use it for 5 hours at a time, every other day at the max, and never during the winter time.


    • #17
      Or would I be better off buying 2 of these and putting them in serious


      • #18
        Originally posted by Umpa View Post
        Or would I be better off buying 2 of these and putting them in serious
        That's the same as a 6v 200ah golf cart battery. I generally suggest the cheap, rugged golf cart batteries as a good starter set. You will need at least 20A to charge them decently.
        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



        • #19
          If you are building a system to learn and have fun with, flooded batteries also let you check state of charge with a hydrometer, which you can't do with an AGM battery.