Second battery in parallel help

7Hunter9
7Hunter9 Registered Users Posts: 11 ✭✭
edited October 2017 in Solar Beginners Corner #1
Hey folks I need some advice. I just added a second battery to my solar system. I'm far from an artist and do not speak electrical or solar well. Everything I've learned has been from forums and youtube. So please don't expect me to be articulate or artistic. That said, does my drawing of how the system can be set up look right? I'm visual so that helps. Thanks in advance! BTW these are two 12v 100ah batteries. 




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  • 7Hunter9
    7Hunter9 Registered Users Posts: 11 ✭✭
    #2
    Or maybe this is a better configuration? 


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  • littleharbor2
    littleharbor2 Solar Expert Posts: 2,113 ✭✭✭✭✭
    #3
    You need to take the pos.+ from one battery and the Neg.- from the other battery. This forces the charging and load to come to/from both batteries evenly. Very good info at this site.
    http://www.smartgauge.co.uk/batt_con.html

    2.1 Kw Suntech 175 mono, Classic 200, Trace SW 4024 ( 15 years old  but brand new out of sealed factory box Jan. 2015), Bogart Tri-metric,  460 Ah. 24 volt LiFePo4 battery bank. Plenty of Baja Sea of Cortez sunshine.

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  • mcgivor
    mcgivor Solar Expert Posts: 3,854 ✭✭✭✭✭✭
    edited October 2017 #4
    Move the positive battery connection to battery 1 and the negative to battery 2 . This will provide better current  ballance between both batteries during charging and dischargeing, inverter connected to same points. Another alternative is to connect all the positive terminals together with a heavy bus bar, do the same with the negative terminals, then connect the controller and loads to the bus bar.
    http://www.smartgauge.co.uk/batt_con.html
    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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  • 7Hunter9
    7Hunter9 Registered Users Posts: 11 ✭✭
    #5
    Thank you littleharbor2 and mcgivor. If I am understanding you both I should configure like this?


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  • mcgivor
    mcgivor Solar Expert Posts: 3,854 ✭✭✭✭✭✭
    edited October 2017 #6
    7Hunter9 said:
    Thank you littleharbor2 and mcgivor. If I am understanding you both I should configure like this?


    Move the positive from the charging source to battery 2 then all is good
    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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  • littleharbor2
    littleharbor2 Solar Expert Posts: 2,113 ✭✭✭✭✭
    #7
    Charging and load (inverter in this case) should BOTH go to the same diagonal points Here you still have charge controller connected to the first battery. Move the positive from controller down to the lower battery.

    2.1 Kw Suntech 175 mono, Classic 200, Trace SW 4024 ( 15 years old  but brand new out of sealed factory box Jan. 2015), Bogart Tri-metric,  460 Ah. 24 volt LiFePo4 battery bank. Plenty of Baja Sea of Cortez sunshine.

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  • kamchuka
    kamchuka Registered Users Posts: 65 ✭✭
    #8
    900 watts pv (building on) on poles, off grid 60a mppt, magnum 2k 12v msw, 1400 ah forklift battery (rewired to 12v), 8k diesel gen for house. honda eu6500, 2x 8D, coleman 800w inv for shop, honda 5k for well (pumps to 1000g cistern), ryobi 2k suitcase for mobile ops. 
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  • littleharbor2
    littleharbor2 Solar Expert Posts: 2,113 ✭✭✭✭✭
    #9
    A picture's worth a thousand words.

    2.1 Kw Suntech 175 mono, Classic 200, Trace SW 4024 ( 15 years old  but brand new out of sealed factory box Jan. 2015), Bogart Tri-metric,  460 Ah. 24 volt LiFePo4 battery bank. Plenty of Baja Sea of Cortez sunshine.

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  • 7Hunter9
    7Hunter9 Registered Users Posts: 11 ✭✭
    #10
    Thank you so much everyone! 
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