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Wiring batteries 2volt to 24volt

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  • #16
    Originally posted by ButchDeal View Post

    Charge controllers are rated on the output voltage not the input voltage. So to get higher voltage string the pv modules together in series ( increases voltage)
    larger battery voltage allows the charge controller to handle more solar wattage.

    Wow!

    That's news to me.

    I thought most charge had a max VOC input rating.

    Most that I have looked at are between 100-150volts.

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    • #17
      Originally posted by PNW_Steve View Post


      Wow!

      That's news to me.

      I thought most charge had a max VOC input rating.

      Most that I have looked at are between 100-150volts.
      Ok we seem to be cross talking here the amps is rated on the output voltage. Yes they do have a max input voltage as well, but the max amperage is with the output voltage. This it handles more inout wattage at higher voltage on the out put ( battery ) side.
      OutBack FP1 w/ CS6P-250P http://bit.ly/1Sg5VNH

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      • #18
        Originally posted by Sapphireminer View Post
        The controller is 100 volts so I guess that would be 2 sets of 2 44v panels in series then connected in parallel to give 88volts . Thanks Dave


        MOD Note. the following is guessing by the poster, and not to be taken as truth for your panels. You should
        make note of the specs on the sticker on your panels, and what the values are:
        Voc ___
        Vmp___
        Isc___
        Imp___



        The 44 Volts you mention , likely is Uopencircuit Uoc ,
        not the Umaximumpowerpoint Umpp .

        Sounds like early 72cell panels .

        But that Uoc is the important one to get maximum allowed panels per string ,
        and the Umpp is the important one to feed the battery .

        48 V battery will need a range of 54 to 60 Volts to be feeded ,
        and if the Umpp would be at 30 Volts , two in series would feed
        a 48 V battery .


        For a 24V setup , one panel per string would suffice to feed that battery
        if Umpp at 26 to 30 Volts .

        Tempetature coefficient needs to be included in Uoc math !
        Last edited by Mike90250; 04-16-2019, 11:22 AM.

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        • #19
          Thanks for all the info more for me to look into. Dave

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