8v golf cart batteries,howe to wire for 24V?

patdufo
patdufo Registered Users Posts: 9 ✭✭
in Off Grid Solar & Battery Systems #1
I have 6 8v golf cart batteries and I am trying to make 24v?series conection that I used with 4 6v batteries doent work because I am left over with 2 positive and 1 negative?every way that I tried ended up 16v?
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  • MrM1
    MrM1 Registered Users Posts: 487 ✭✭✭✭
    edited June 2018 #2
    Maybe I'm not seein what you're sayin. Wouldn't that configure as 3S/2P
    REC TwinPeak 2 285W 3S-3P 2.6kW-STC / 1.9kW-NMOT Array / MN Solar Classic 150 / 2017 Conext SW 4024 Inverter latest firmware / OB PSX-240 Autotransfomer for load balancing / Trojan L16H-AC 435Ah bank 4S connected to Inverter with 7' of 4/0 cable / 24 volt system / Grid-Assist or Backup Solar Generator System Powering 3200Whs Daily / System went Online Oct 2017 / System, Pics and Discussion
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  • mcgivor
    mcgivor Solar Expert Posts: 3,854 ✭✭✭✭✭✭
    edited June 2018 #3
    patdufo said:
    I have 6 8v golf cart batteries and I am trying to make 24v?series conection that I used with 4 6v batteries doent work because I am left over with 2 positive and 1 negative?every way that I tried ended up 16v?
    There is no way with 6 × 6V batteries to achieve a series parallel configuration for 24V, it's either use 4 in series ~ 200Ah, or 8 in series parallel, 4 in each string × 2 for~400Ah.

    Edit. Disregard abuse statement for 8 volt  batteries.
    1500W, 6× Schutten 250W Poly panels , Schneider MPPT 60 150 CC, Schneider SW 2524 inverter, 400Ah LFP 24V nominal battery with Battery Bodyguard BMS 
    Second system 1890W  3 × 300W No name brand poly, 3×330 Sunsolar Poly panels, Morningstar TS 60 PWM controller, no name 2000W inverter 400Ah LFP 24V nominal battery with Daly BMS, used for water pumping and day time air conditioning.  
    5Kw Yanmar clone single cylinder air cooled diesel generator for rare emergency charging and welding.
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  • BB.
    BB. Super Moderators, Administrators Posts: 33,615 admin
    #4
    8 (eight) volt batteries... Yes, 3x in series by 2x parallel strings (6 batteries total).

    Should work fine. Make sure they are fully charged (or each battery at a similar level a charge--You don't want a discharged battery in series with a charged battery--If you "equalize" the battery bank (over charge at ~30-32 volts), you are pushing excessive charging current through the full battery to get charging current to the discharged battery.

    -Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
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  • mcgivor
    mcgivor Solar Expert Posts: 3,854 ✭✭✭✭✭✭
    #5
    Missed the 8 volt, need to buy some stronger reading glasses.
    1500W, 6× Schutten 250W Poly panels , Schneider MPPT 60 150 CC, Schneider SW 2524 inverter, 400Ah LFP 24V nominal battery with Battery Bodyguard BMS 
    Second system 1890W  3 × 300W No name brand poly, 3×330 Sunsolar Poly panels, Morningstar TS 60 PWM controller, no name 2000W inverter 400Ah LFP 24V nominal battery with Daly BMS, used for water pumping and day time air conditioning.  
    5Kw Yanmar clone single cylinder air cooled diesel generator for rare emergency charging and welding.
    · Share on Twitter

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