Does 24V Batteries Exist?

hmong2017
hmong2017 Registered Users Posts: 39 ✭✭
edited April 2018 in Solar Beginners Corner #1
I was looking to upgrade my 12V batteries Ampere Hour, but my friend told me to get a single 24V battery with bigger amperage. 
I looked basically all over the internet for 24V batteries and they just don't seem to exist. 
I asked him again and he said a solar company gave him a quote and it includes 24V batteries.... Not sure if it is even true... 

So does these 24V Batteries exists? If so are they just only sold by commercial solar companies for homes or where can I find them? 

I have a 24V System Set up. 
breakdown:
6 of 260 WATT Max 30V 
midnite Combine Box with 6 breakers
MPPT 80A Controller
5000 WATT Power inverter 24V
and 6 of 12V 100Ah Deep Cycle Universal Batteries TYPE AGM Sealed Acid 
I parallel them to make 24V.  Connect two batteries to make it 24v. So basically I only have 3 battery...... 

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  • mike95490
    mike95490 Solar Expert Posts: 9,583 ✭✭✭✭✭
    #2
    24v batteries exist for small applications, like alarm boxes and such.  But for serious energy, you should be looking at
    6V 200ah batteries - 4 of them in series gives you 24V @ 200ah and no parallel strings.

    need more power, go with L16 AGM and get 370ah
    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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  • mike95490
    mike95490 Solar Expert Posts: 9,583 ✭✭✭✭✭
    #3
    GC2 AGM  @ 200ah
    or
    L16 AGM @ 370ah    Wire 4 of them in series, get 24V at 200 or 370 ah
    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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  • Photowhit
    Photowhit Solar Expert Posts: 6,006 ✭✭✭✭✭
    #4
    In truth, no flooded lead acid battery is higher voltage than 2.1... volts. A 6 volt golf cart battery is actually 3 - 2 volt nominal batteries in series. a 12 volt 'battery' is 6 batteries 'hard wired' together.

    So find the number of amp hours you need and feel free to string 2-12 volt 'batteries' together or 4 - 6 volt 'batteries' or 12 - 2 volt 'batteries'

    Picture of 2 volt cells/batteries strung together;
    Image result for 2 volt cell
    Home system 4000 watt (Evergreen) array standing, with 2 Midnite Classic Lites,  Midnite E-panel, Magnum MS4024, Prosine 1800(now backup) and Exeltech 1100(former backup...lol), 660 ah 24v Forklift battery(now 10 years old). Off grid for 20 years (if I include 8 months on a bicycle).
    - Assorted other systems, pieces and to many panels in the closet to not do more projects.
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  • Photowhit
    Photowhit Solar Expert Posts: 6,006 ✭✭✭✭✭
    #5
    hmong2017 said:
    6 of 260 WATT Max 30V 
    midnite Combine Box with 6 breakers
    MPPT 80A Controller
    This is a problem, Looks like you plan to have 6 panels in parallel, since they have a 30v (VMP?) they will not work well with an MPPT type charge controller all in parallel to charge a 24 volt battery bank. Use strings of 2 or 3 so the MPPT type charge controller will have at least 30% higher voltage than the charging voltage, for a 24 volt battery bank, that's 28-30 volts. In strings of 3 they will work somewhat less efficiently, but you would not need a combiner box. Check they might have too high a VOC in a string of 3 butunlikely on most charge controllers.

    Home system 4000 watt (Evergreen) array standing, with 2 Midnite Classic Lites,  Midnite E-panel, Magnum MS4024, Prosine 1800(now backup) and Exeltech 1100(former backup...lol), 660 ah 24v Forklift battery(now 10 years old). Off grid for 20 years (if I include 8 months on a bicycle).
    - Assorted other systems, pieces and to many panels in the closet to not do more projects.
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  • oil pan 4
    oil pan 4 Solar Expert Posts: 767 ✭✭✭✭
    #6
    I saw a marine deep cycle battery not too long ago that was 24v.

    Solar hybrid gasoline generator, 7kw gas, 180 watts of solar, Morningstar 15 amp MPPT, group 31 AGM, 900 watt kisae inverter.

    Solar roof top GMC suburban, a normal 3/4 ton suburban with 180 watts of panels on the roof and 10 amp genasun MPPT, 2000w samlex pure sine wave inverter, 12v gast and ARB air compressors.

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  • Estragon
    Estragon Registered Users Posts: 4,496 ✭✭✭✭✭
    #7
    All lead acid batteries are nominal 2v cells. 6 cells = 12v. There's no reason why a battery couldn't be 24v (12 x 2v cells), but the cells would have to be fairly small for the battery to be easily moved by hand. Anything bigger than 150-175 amp-hours gets too heavy at 12v, so 1/2 that (~75-90ah) would be about a practical limit for 24v.

    I imagine a 24v marine battery would be a bit of a specialty item, and putting 2 x 12v batteries in series would work fine and be cheaper for most applications.

    Either way, it's 12 x 2v nominal cells connected in series. There's no such thing as a single 24v lead acid cell.
    Off-grid.  
    Main daytime system ~4kw panels into 2xMNClassic150 370ah 48v bank 2xOutback 3548 inverter 120v + 240v autotransformer
    Night system ~1kw panels into 1xMNClassic150 700ah 12v bank morningstar 300w inverter
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