Batteries

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banjorene
banjorene Solar Expert Posts: 36 ✭
in Solar Beginners Corner #1
I have four us2200xc6 volt batteries giving me 12 volts 450 amp hours
I'm trying to find the specs for all charge rates,max charge ,float,etc.
I have not been able to find it . Any help gets a big Thank You
Rene
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  • mike95490
    mike95490 Solar Expert Posts: 9,583 ✭✭✭✭✭
    #2
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    Re: Batteries

    Google can't find that string [ us2200xc6 ]

    So you should have a mgf name & model # on the batteries.

    Rule of thumb, normal charge rate, about 10 % of rated AH, so 45A charger would likely be safe.

    Our Host, wind-sun has a battery page http://store.solar-electric.com/batteries.html
    and a deep cycle battery FAQ http://www.windsun.com/Batteries/Battery_FAQ.htm that has some of the info in it, but really, the battery Mfg has the last say on the specs you seek.

    The first thing , is what style of battery are they, Flooded (with fill caps on top) AGM, Gel, or what ?? They battery type does influence the voltages at different charging stages, if a sealed AGM battery was to be charged like a flooded cell, it would be destroyed in a few weeks.
    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 ||
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    || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

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  • niel
    niel Solar Expert Posts: 10,300 ✭✭✭✭
    #3
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    Re: Batteries

    it would appear they have a high absorb voltage by the pdf here from the manufacturer. each 6v battery fully charged = 7.75v or more and for 2 in series or 12v systems it's 15.5v or more.
    http://www.usbattery.com/usb_images/warr_chart_2008_a.pdf
    they don't specify a float voltage and that you can email them for, but i'd suspect around 6.75-6.9v. multiply by 2 for 12v.
    btw the ah 20hr capacity is 232ah for your battery so in parallel this creates 464ah.
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  • BB.
    BB. Super Moderators, Administrators Posts: 33,447 admin
    #4
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    Re: Batteries

    From the US Battery Website:(typed manually from img file)
    • C/10 charge current (20 Hour rate AH Capacity)
    • Charge until 2.583 per cell (7.75@6v, 15.50@12v)
    • Hold voltage for 2 to 4 hours then stop charging.
    • Charge time = 10 hours
    • Reduce charge voltage by 0.028 volts per cell for every 10F above 80F, increase voltage by same amount for every 10F below 80F.
    • Float: 2.17 volts per cell (with above temp adjustments--13.02 volts for floating a "12 volt" battery bank)
    Link to home page and to their download PDF page for other product information (including cycle life vs discharge chart).

    Their sizing recommends multiply AH requirement by 2.4x... 2x (50% max discharge), +20% (for aging). Don't discharge below 1.200 specific gravity.

    Typed in the information to make it easier to fine in Wind-Sun forum when searched.

    -Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
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  • banjorene
    banjorene Solar Expert Posts: 36 ✭
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    Re: Batteries

    Thanks everyone
    Neil your correct on the amp hours I just like the number 450 I guess.
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  • niel
    niel Solar Expert Posts: 10,300 ✭✭✭✭
    #6
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    Re: Batteries

    banjorene,
    you're welcome and you might want to double check with the manufacturer on these voltages as it goes from very high absorb to a bit low on float imho.
    bb,
    i missed that float voltage spec and that in general seems low to me. most controllers may have difficulty going that much of a spread between absorb and float as many are limited to up to 2v like blue sky or the xantrex c series that don't have the ability to go over 15v on absorb, but can float at 13v.
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  • BB.
    BB. Super Moderators, Administrators Posts: 33,447 admin
    #7
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    Re: Batteries

    Niel,

    Yea--every vendor seems to have its own spin on charging/maintenance...

    Sounds like US Battery likes to charge "hard" (pretty much an equalization/stirring charge every cycle) and then float at just above the "full charge" level of the battery... Will use a bit of water when charging--but probably hardly anything when floating/storage... When the battery is "put back into service" after a winter's float--probably would not hurt to run a charge cycle through it first.

    -Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
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