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  • two different banks into 1 inverter

    Hello. I have a 6v bank wired to 12v and a bank of 12v batteries. I want to toggle from using 1 bank or the other. My switch is one of those three way. I was thinking of having positiveif bank 1 to it's own connect. bank two positive to the other connect. And negative of both batteries to the negative on the switch.

    If it works, what would happen if I accidentally put switch to bank one positive and bank two positive simultaneously? The switch has that function, a 1+2 setting.


    Tried to be clear. Let me know if you understand. Thanks.

    The diagram is from manufacturer of pictured switch
    Attached Files
    Last edited by bradadad; 08-25-2019, 06:30 PM.

  • #2
    This switch ?
    https://www.tibs.com/MPZQP9970BUMA/c...vehicles-4055c

    Your description has many mistakes and is difficult tp understand.

    To answer you question ...

    NO !
    You cannot have a 6 Volt Battery Bank #1 and a 12 Volt Battery Bank #2 connected in parallel using "1 + 2" feature of the switch.
    The voltage of the two banks must be the same to use the "1 + 2" paralleling feature of the switch.

    Or are you asking ...
    If you have two x 6 volt batteries connected in SERIES to make a 12 volt bank #1 and a 12 volt battery as Bank #2 then is it OK to use the "1+2" position?
    Yes, that is OK.
    Last edited by NEOH; 08-25-2019, 07:41 PM.

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    • #3
      Battery [B]banks [/B]are not supposed to be switched in and out. The switch you show, is designed to switch from 1 [B]battery [/B]to another [B]battery[/B], and it's contacts will likely burn, or weld themselves together with a large battery [B]bank[/B]
      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

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      • #4
        It's a 6v bank made 12v by series connection and a 12v bank in parallel. I wanted to charge 1 while using the other. I decided it's above my head to combine if possible. I have an almost complete system anyway so I'll just separate the 2nd battery bank and give it it's own panels.

        Comment


        • #5
          OK - It is a 12 Volt Bank, made from 6 volt batteries - which are connected in series.


          Whats size, in "Amp-Hours' are each of your battery banks?
          Amp-Hours of Battery Bank #1 = ?
          Amp-Horus of Battery Bank #2 = ?

          With a reasonable sized system, I do not think the contacts will "burn, fuse or weld together" when two 12 volt banks are used.

          Starting in position "Bank #1 Only".
          Next move the switch to "Both Bank #1 & #2"
          Then move the switch to Bank #2 Only"
          You have successfully switched the inverter from Battery Bank #1 to Battery Bank #2.
          No big deal.

          If you have any concerns, then shut the inverter OFF first, then switch from "Bank 1 Only" to "Bank #2 Only " and turn the inverter back ON.
          The switch is rated 200 amps continuous = 2,400 watts max,
          Watt size ( watts ) inverter are you switching?

          How many amps is your PV Battery Charger?
          Are you switching the PV Battery Charger, too?
          Last edited by NEOH; 08-25-2019, 09:02 PM.

          Comment


          • #6
            Wouldn't there be problems if the battery banks are either, 1. different capacities when going to #1 & #2? or 2. One bank is heavily discharged and the other if fully charged when going to1 & 2?
            2.2kw Suntech mono, Classic 200, NEW Trace SW4024

            Comment


            • #7
              Explain WHY you think it would be a problem ...

              Comment


              • #8
                When both battery banks are connected there could be a large current surge from the larger or fully charged bank into the smaller or heavily discharged bank.
                2.2kw Suntech mono, Classic 200, NEW Trace SW4024

                Comment


                • #9
                  Originally posted by NEOH View Post
                  Explain WHY you think it would be a problem ...
                  Because if the banks are not at identical state of charge, and it's unknown if the switch is Break-Before-Make or Make-Before-Break. Marine switches are often made in both styles. And they are seldom rated for a battery BANK, just a solo battery on each. Most of the switches are only rated 200 - 300 amps.
                  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

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