recharging 24v battery bank

bkatt03
bkatt03 Registered Users Posts: 1
in Solar Beginners Corner #1
I am planning to build a solar generator with a 24v battery bank (4 12v 100AH batteries). How do I calculate recharge time with 24v panels? I know how to figure it for 12v systems but can't find any info on 24v.
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  • Cariboocoot
    Cariboocoot Banned Posts: 17,615 ✭✭✭
    #2
    Re: recharging 24v battery bank

    Welcome to the forum.

    Calculating recharging times is guesswork, no matter what the system Voltage. The reasons being that not all batteries have the same efficiency, the charging isn't linear, temperature has an effect, and most of all the State Of Charge you start out with will not be a constant.

    Otherwise what is needed to recharge a 24 Volt system follows the same principals as a 12 Volt system, just 2X the Voltage.

    See this thread: http://forum.solar-electric.com/showthread.php?15989-Battery-System-Voltages-and-equivalent-power
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  • mike95490
    mike95490 Solar Expert Posts: 9,583 ✭✭✭✭✭
    #3
    Re: recharging 24v battery bank

    Convert all your calc's into watt-hours, and then try WH consumed need WH x2 to be harvested. Generally, the end-end efficiency of a good battery system, is only about 50%. Charge controller losses, battery losses, panel nameplate loss, inverter losses.......
    Powerfab top of pole PV mount | 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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