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    Wire batteries in series or parallel

    How should i wire my batteries also whats the differecne between these two and
    also what are these for The Install Bay IB500 500 Amp Battery Isolator and Relay (ib-500)







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    Re: Wire batteries in series or parallel

    Parallel.



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    Re: Wire batteries in series or parallel

    Parallel



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    Re: Wire batteries in series or parallel

    series would destroy most of the vehicle's electronics.

    batteries in series add their voltages, so two 12VDC batteries in series would be 24VDC.

    batteries in parallel add their current supply capabilities while voltages remains the same.

    the isolator is a large relay that opens when the car is off to disconnect the front and rear batteries. it prevents the two batteries from discharging into each other while they sit.

    people also use isolators so they can park-n-play without draining the front battery down. this has an adverse effect when the two are recombined and the main battery discharges into the rear battery.



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    Re: Wire batteries in series or parallel

    Quote Originally Posted by keep_hope_alive View Post
    <snip> people also use isolators so they can park-n-play without draining the front battery down. this has an adverse effect when the two are recombined and the main battery discharges into the rear battery.
    Never having used one, but being curious... could the relay be delayed until the engine is started?



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    Re: Wire batteries in series or parallel

    series works for hydraulics


    But they are right, parallel keeps everything a 12 volt system. If you series them you jump to 24 volts or higher depending on how many batteries you have.




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    Re: Wire batteries in series or parallel

    Quote Originally Posted by maylar View Post
    Never having used one, but being curious... could the relay be delayed until the engine is started?
    That is an issue, and you could build an analog delay for a specified time easily. Requiring the engine to be running is possible, but more involved in analyzing the schematics and safely adding that function. I would use a NPN transitor to isolate the relay control from the circuit you use.



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    Re: Wire batteries in series or parallel

    Quote Originally Posted by keep_hope_alive View Post
    That is an issue, and you could build an analog delay for a specified time easily. Requiring the engine to be running is possible, but more involved in analyzing the schematics and safely adding that function. I would use a NPN transitor to isolate the relay control from the circuit you use.
    Seems like it aught to be a feature built in to the isolator. Wouldn't be a big deal, and it'd add marketing appeal.

    In the old days we used the alternator's "idiot light" circuit or a switch on the oil pressure sensor to operate relays when we needed something switched with "engine running". Worked for electric chokes etc. Prolly more difficult with today's computerized cars.



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    Re: Wire batteries in series or parallel

    adding features adds cost. no one wants to add cost.

    tapping circuits now - it's all digitally controlled outputs for LEDs and you don't want to add any load to them. old days had lamps which drew a decent amount of current anyway...



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    Re: Wire batteries in series or parallel

    Quote Originally Posted by keep_hope_alive View Post
    people also use isolators so they can park-n-play without draining the front battery down. this has an adverse effect when the two are recombined and the main battery discharges into the rear battery.
    Could you elaborate on this please?




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    Re: Wire batteries in series or parallel

    Quote Originally Posted by TDot View Post
    Could you elaborate on this please?

    the isolator makes the one in the rear stand alone, isolates it from the front. It's not drawing anything from the front one

    When you combine them again, the back battery will be resting lower then the front from the usage. The batteries will want to equal out, the back one will drain from the front till they are sitting equal

    Something like that



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    Re: Wire batteries in series or parallel

    Thanks, I kind of expect the back to draw from the front at start by the nature of the set up. The quetion is, why is this a problem? I would expect if it was serious there would be a ready made work around. Can something be damaged? What are adverse consequences of this? How bad can it really be? GENERALLY how long would it take for the battery to charge back up? Would a capacitor inbetween the batteries help/remedy the issue?




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    Re: Wire batteries in series or parallel

    wire it in series. and then make a video of the smoke and damage that follows



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    Re: Wire batteries in series or parallel

    Great responsive help...if that actually made sense to me or resolved my questions. Anyone else care to actually answer my questions and provede a helpful response that I can actually learn from and prevent my car from smoking like the previous genious felt compelled to state...considering I'm actually here to learn something and prevent said problem(s)?




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    Re: Wire batteries in series or parallel

    Paralleling batteries that are at different voltages is very hard on them. Shortens life.



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