Battery connection suggestion needed

DarkstormNH
DarkstormNH Registered Users Posts: 48 ✭✭
in Solar Beginners Corner #1

Guys I need help, I have 8 6 volts batteries I’m going to connect for 24 volts which of the below approach is the better balance one

 



please advise 

 

 

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  • mcgivor
    mcgivor Solar Expert Posts: 3,854 ✭✭✭✭✭✭
    #2
    Both diagrams are essentially the same, the top as a physical layout is preferable as the jumpers are kept shorter and the positive and negative connections are diagonally opposite  which is the correct method to ballance the charge. Check the Morningstar site or other battery manufacturers for recommendations or confirmation. 
    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.  
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  • jonr
    jonr Solar Expert Posts: 1,386 ✭✭✭✭
    #3
    If you really want the best balance, measure the two currents and the voltages across each battery.  Then shuffle the batteries around  to optimize.

    I am available for custom hardware/firmware development

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  • mike95490
    mike95490 Solar Expert Posts: 9,583 ✭✭✭✭✭
    edited October 2016 #4
    Hard to improve on the techniques here:
    http://www.smartgauge.co.uk/batt_con.html
      and their last line:
    And finally, finally, we keep getting asked where the chargers should be connected to. We didn't address this question because it seemed so blatantly obvious where they should be connected that it never occurred to us that anyone might be unsure. The chargers should always be connected to the same points as the loads. Without exception.

    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

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