Will this configuration damage batteries ?

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  • sibitg13
    Junior Member
    • Feb 2021
    • 3
    #1

    Will this configuration damage batteries ?


    I am planning an off grid system with below specification:
    1. Panel - 330w 24v x 4
    2. Battery - C10 12v 150ah x 2 in series
    3. Inverter - 2.8kva 24v
    4. MPPT - 24v 50A

    Assume I am using an average of 1000 watts from 6am to 3pm. After that around 300 watts average. Maximum will be 2200 watts from an Induction stove for a short period.

    My concern is whether the battery capacity is enough for this system.
    If not, what is the maximum inverter capacity suitable for this battery system?
    I can not increase the battery capacity due to my budget.

    Thanks in advance.
    Last edited by sibitg13; 02-23-2021, 07:16 PM.
    Tags: None
    • Mike90250
      Moderator
      • May 2009
      • 16020
      #2
      Nope. Your 1,000 watt 6am-3pm is going to consume ALL the power from your PV, with nothing left to recharge the batteries.

      Effective sun is only 10am - 2pm. So you have to plan your total harvest in those hours to both run loads and recharge the 6am - 10 am loads.
      This will be a large 48V system
      Powerfab top of pole PV mount (2) | 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

      solar: http://tinyurl.com/LMR-Solar
      gen: http://tinyurl.com/LMR-Lister

        Comment

        • sibitg13
          Junior Member
          • Feb 2021
          • 3
          #3
          Originally posted by Mike90250
          Nope. Your 1,000 watt 6am-3pm is going to consume ALL the power from your PV, with nothing left to recharge the batteries.

          Effective sun is only 10am - 2pm. So you have to plan your total harvest in those hours to both run loads and recharge the 6am - 10 am loads.
          This will be a large 48V system
          Thank you very much.
          So I need to reduce the load further, since I do not have budget to increase capacity now.
          I think I will remove the Induction stove and reduce consumption after 12pm, let me see.

            Comment

            • Mike90250
              Moderator
              • May 2009
              • 16020
              #4
              Originally posted by sibitg13

              Thank you very much.
              So I need to reduce the load further, since I do not have budget to increase capacity now.
              I think I will remove the Induction stove and reduce consumption after 12pm, let me see.
              That's only going to make a small dent. The 1kw drain from 6am to noon, works out to be 6kw, plus the rest of your day. I have a large 48V system and my daily winter budget is <7kwh and < 12kwh in summer when water pumps run.

              Both your battery and your PV is too small.

              1000 watts from 6am to 3pm. After that around 300 watts average
              That load (w/o stove) is
              ( 9kwh ~ 1kw for 9 hr) & ( 4.5kwh ~ 300w for 15 hr)
              13.5kwh daily load. needs a 70kwh battery. At 48V, that's a 300ah battery bank. That bank needs about 40A to properly charge, so a 3kw PV array would be needed
              [ generic back of the napkin guesses ]
              Powerfab top of pole PV mount (2) | 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

              solar: http://tinyurl.com/LMR-Solar
              gen: http://tinyurl.com/LMR-Lister

                Comment

                • sibitg13
                  Junior Member
                  • Feb 2021
                  • 3
                  #5
                  Thank you Mike.
                  I need to rework my plan.
                  Details were really helpful, otherwise I would have invested in this system.

                    Comment

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