Charge voltage for 48v bank

rgk1
rgk1 Solar Expert Posts: 135 ✭✭✭
in Solar Beginners Corner #1
Just got 8 new Sam's club (Duracell) GC2 batteries and will be making the move to 48 volt system.  Will reprogram the Tristar MPPT 45 controller.  Just looking for recommendations for bulk/absorb/float and EQ voltages.
4-Risen 320 watt in series/parallel, 8-215ah 6 volt GC2 batteries in series, Exeltech 1100 watt/48 volt inverter, Tristar 45 MPPT controller.
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  • Raj174
    Raj174 Solar Expert Posts: 795 ✭✭✭✭
    #2
    I believe this is what you're looking for if your batteries are 215 amp hour. These voltages are for 24 volt, so double for 48 a volt bank.

    https://forum.solar-electric.com/discussion/339311/duracell-branded-6v-info

    Rick
    4480W PV, MNE175DR-TR, MN Classic 150, Outback Radian GS4048A, Mate3, 51.2V 360AH nominal LiFePO4, Kohler Pro 5.2E genset.
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  • rgk1
    rgk1 Solar Expert Posts: 135 ✭✭✭
    #3
    Thanks Raj174  As common as these batteries are I figured the numbers had to be somewhere but I couldn't find them.
    4-Risen 320 watt in series/parallel, 8-215ah 6 volt GC2 batteries in series, Exeltech 1100 watt/48 volt inverter, Tristar 45 MPPT controller.
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  • rgk1
    rgk1 Solar Expert Posts: 135 ✭✭✭
    #4
    I did notice from this link that there is no Bulk voltage listed. It only shows a C/10 rate. Is Bulk and Absorb the same thing here?
    4-Risen 320 watt in series/parallel, 8-215ah 6 volt GC2 batteries in series, Exeltech 1100 watt/48 volt inverter, Tristar 45 MPPT controller.
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  • Raj174
    Raj174 Solar Expert Posts: 795 ✭✭✭✭
    #5
    Yes, bulk really just describes the constant current charging phase. The absorb voltage setting is what the charger uses throughout the bulk charging phase. So, yep, the same.
    4480W PV, MNE175DR-TR, MN Classic 150, Outback Radian GS4048A, Mate3, 51.2V 360AH nominal LiFePO4, Kohler Pro 5.2E genset.
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