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Thread: Hooking up multiple batteries?

  1. #11

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    Even greener here, as I have yet to purchase my system. But I was planning on getting the 80 watt Northern Tool system. And will use 2 batteries as well.

    I found this forum searching how to hook up multiple batteries, and it answered that question. But where would the inverter be hooked up to as with the intakes of the solar lines? Hopefully that makes sense.

    MZ

  2. #12
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    I thought I read it all but thanks for posting this info on connecting bateries. I was always under the impression that the impedence of each of the batteries will vary and connecting them was critcle . this article really helps. this explains alot why one of the batteries in a bank usually does not always reccharge like the others . (all batteries were new). good lesson learned. should put a book out on frequently DIY mistakes. thanks.

  3. #13
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    JohnnyK...glad you attained some new knowledge here at Solar Panel Talk. Thanks for the feedback!

  4. #14
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    Smile

    Nice bit of info there. I Knew there had to be a right and wrong way to do it. thanks for showing us the difference. As well as explaining why there is a right and wrong way to do it.

  5. #15
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    Quote Originally Posted by milezone View Post
    I found this forum searching how to hook up multiple batteries, and it answered that question. But where would the inverter be hooked up to as with the intakes of the solar lines?
    Inverters connect to the battery bank, at the same terminals that the charger connects to.
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  6. #16
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    Default Hooking up the inverter

    First and foremost, the solar panels must be connected to a charge controller ( morningstar is a good charge controller,but there are others like VDC electronics) the charge controller takes the power generated by the panel ( FROM THE TWO WIRES) and allows that power to be controlled to charge your batteries during the day time. at night that same controller prevents the batteries to back charge into the panel thus causing the battery to charge down much to quickly thru the panels, (known as the blocking diode).
    Now the inverter is connected to the same out out terminals (on the BATTERY) AS THE CHARGE CONTROLLER. (YOU MUST PAY ATTENTION TO THE POLARITY). THE INVERTER TAKES THAT 12vdc FROM THE BATTERY AND CONVERTS IT TO AN ac VOLTAGE OF 120 VOLTS to which you can connect an appliance. There is alot more to it than this simple explanation. You must understand that there is no infinite amount of energy from the battery, and as you use up the power you will need to rechrge. hence the solar panels. there is a way to size a sytem. go to the this sight http://www.altestore.com/howto/The-B...ectricity/a19/ there are other sights that can help you.

  7. #17
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    Quote Originally Posted by Mike90250 View Post
    Here's a great article about connecting batteries on the diagonal
    http://www.smartgauge.co.uk/batt_con.html (connect batteries on diagonal )
    That was a fantastic article. Thanks for posting that!

    Funny-- I hooked mine up on the diagonal instinctively without ever really knowing factors involved. It just seemed to make good sense.
    I'm glad I was right this time...that same attitude could really foul up a situation if found to be wrong.

  8. #18
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    Thumbs up Hooking Up Multiple batteries

    Connecting Multiple RV Batteries
    *****************************
    When installing more than one battery for use with the 12 volt RV system, it is recommended to purchase the batteries at the same time. The batteries should be matched with regard to capacity, brand, and age. This will give you the best possible life from your RV battery bank.

    RV Battery Voltages:-
    --------------------
    RV Batteries are constructed to supply 12 volts or 6 volts (for the purpose of this article).
    In most cases two six volt batteries will have about 20% more capacity than two similar sized 12 volt batteries. This is due to the larger plates that are built into a six volt battery.

    RV Battery Circuits:-
    -------------------
    Two 12 volt batteries are connected in a parallel configuration with the two positive terminals connected together and to the positive trailer lead. The negative terminals are connected together with the trailer negative lead.

    Two six volt batteries need to be connected in a series circuit in order to get the 12 volt needed to run the coach system. In this case the trailer positive lead is connected to the positive terminal of the first battery. The negative terminal of that battery is connected to the positive terminal of the second battery. Finally, the negative terminal of the second battery is connected to the trailer negative lead. The size of the jumper wire should match or exceed the size of the trailer leads.

    RV Battery Polarity:-
    --------------------------
    It should be noted that the positive lead from the trailer is normally the black colored wire(s) while the negative lead is the white colored wire(s). This is sometimes confusing, as most automotive applications use red as the positive and black as the negative. Polarity is very important to the electronics and the various motors in the RV and must not be reversed.

    Note: battery terminals (or posts) are marked with a plus sign for the positive terminal and a minus sign for the negative terminal.

    To make it even more confusing, makers of after market items, such as solar panels will have the red wire as positive and black as the negative.

    Before disconnecting your RV battery for any reason, it is suggested that you tape the wires together near the terminal that they are attached to and then mark them with respect to what terminal they go to. This will avoid confusion and reversed leads when re-connecting the terminals.

  9. #19
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    so which is better for a battery system.

    Two 6V batteries at 220cca in series.

    Or two 12V Batteries at 220cca in Parallel

    Both will give you 12V, but which would have more capacity or last longer under a given load?
    I don't get drunk~~~~I get awesome

  10. #20
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    I feel batteries in SERIES (2, 6V wired for 12V) is much better:

    1) one fuse needed
    2) load/charge hogging issues eliminated
    3) no parallel strings to troubleshoot.

    Both have same capacity in watt hours, and would last the same under the same load.

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