How do you connect a parallel battery bank to controller

TDSolarguy
TDSolarguy Solar Expert Posts: 31 ✭✭
in Solar Beginners Corner #1
Hello All
I'm needing some advice on how to connect to a solar controller from two batteries connected in parallel . I know that on the battery side one connects positive to positive and negative to negative.

The step on where to connect from the batteries to the controller is what I'm not sure of.
Do I connect from one positive on one battery and then negative from the other battery to the controller?

Or do I connect one positive and one negative from just one of the batteries to the controller.

I'm thinking it's the first one.

Thanks

T D Solar guy
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Comments

  • BB.
    BB. Super Moderators, Administrators Posts: 33,642 admin
    #2
    Re: How do you connect a parallel battery bank to controller

    Ideally, you want the resistance from the "bus bar +/- common points" to be equal path (resistance) to each battery in parallel (to ensure balanced current flow during charging and discharging). Here is one website that does a good job of explaining the options:

    www.smartgauge.co.uk/batt_con.html

    -Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
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  • vtmaps
    vtmaps Solar Expert Posts: 3,741 ✭✭✭✭
    #3
    Re: How do you connect a parallel battery bank to controller

    TD, that smartgauge site is a great resource, but it illustrates how to connect 4 batteries in parallel. Here is a more explicit diagram for 2 batteries.
    Attachment not found.
    --vtMaps
    4 X 235watt Samsung, Midnite ePanel, Outback VFX3524 FM60 & mate, 4 Interstate L16, trimetric, Honda eu2000i
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  • Cariboocoot
    Cariboocoot Banned Posts: 17,615 ✭✭✭
    #4
    Re: How do you connect a parallel battery bank to controller
    TDSolarguy wrote: »
    Do I connect from one positive on one battery and then negative from the other battery to the controller?

    You are correct: it's this one. :D
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  • TDSolarguy
    TDSolarguy Solar Expert Posts: 31 ✭✭
    #5
    Re: How do you connect a parallel battery bank to controller

    Thak you so much guys.

    T D Solar guy
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