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Newby needs help with choosing batteries

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  • #31
    When you say 20% do you mean you only use 20% and want stop using the battery once it drops down to 80% charged ? Or you want to stop using the battery once it drops down to 20% charged ?

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    • #32
      Originally posted by Jessejames801 View Post
      When you say 20% do you mean you only use 20% and want stop using the battery once it drops down to 80% charged ? Or you want to stop using the battery once it drops down to 20% charged ?
      Stop at 80% SOC or 20% DOD. If you plan to use 1 Kwh per day takes a 5 Kwh battery.

      a 12 volt 55 AH battery has a total capacity of 660 watt hours or .66 Kwh with a daily usage 130 watt hours per day.
      MSEE, PE

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      • #33
        I think I'm going to go with a 200 watt kit that comes with a 30amp charge controller with this set up instead of the 55 ah battery what size should I go battery should I go with ?

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        • #34
          Originally posted by Jessejames801 View Post
          I think I'm going to go with a 200 watt kit that comes with a 30amp charge controller with this set up instead of the 55 ah battery what size should I go battery should I go with ?
          The battery size will depend on what type (PWM or MPPT) charge controller you get.

          With a PWM then the charging amps will be the total of that 200 watt system can produce. Probably around 11 amps which would match up to a 100Ah battery.

          If you are using a MPPT CC that could produce almost 17amps (200w / 12volt = 16.7a) which would allow you to go with a 150Ah battery.

          Sunking answered your question. 20% DOD means there is 80% SOC left in the battery. SOC = State of Charge.

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