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12 and 24v common negative ?

Old 07-13-2019, 07:43 PM
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Default 12 and 24v common negative ?

I have a 24v battery system and 12v battery system is it normal for them to share a common negative?
also in my 24 volt house battery system can I connect the 12v terminals to 12v devices at the same time ?
I also have a 12v wind generator can I connect it to my 24v battery system if I use the 12v terminals? I have 2 12v batteries in series.
thanks very much I hope I have explained things correctly.
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Old 07-13-2019, 08:37 PM
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I have a 24v battery system and 12v battery system is it normal for them to share a common negative?
Yes
also in my 24 volt house battery system can I connect the 12v terminals to 12v devices at the same time ?
Don't understand what you mean. The two systems should be separate.
I also have a 12v wind generator can I connect it to my 24v battery system if I use the 12v terminals? I have 2 12v batteries in series.
thanks very much I hope I have explained things correctly.
yes. You have 2, 12 V batteries in series to produce 24 volts. for 12 volt devices you draw off of one battery. For 24 volt devices you draw off both batteries wired in series (do you know the difference between series and parallel?)
Your 12V solar charge should be wired to charge each battery separately. For batteries wired in series to produce 24V, there are devices that isolate each battery so they can be charged separately.
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Old 07-14-2019, 06:02 AM
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I have a house battery bank which is 24v and. I want to connect an emergency combiner for my 12v engine battery is this ok if I obviously connect it to the the post that reads 12v.about my wind generator which I have had in the box for 12 years!! I wanted to also connect it to my 24v bank.in my very basic understanding wont the energy sort of overflow into the other batteries if again I connect it to the 12v post.i am installing a big fridge in the day I have solar panels but I wanted the wind generator to help out at night. I also have a aluminum boat so I'm always worried about electricity!
thank you very much peter.
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Old 07-14-2019, 05:14 PM
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I am not sure what is available for switching in the marine market. All I see is something using the Perko style "One-Both-Two" switch.
I have a situation with my golf cart where I wanted to be 36v (three 12v sources in series) and also set them so it was 12v out with all 3 in parallel. I made it happen with two DPDT 100a enclosed knife switches I got on Ebay for about $30-35.
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Old 07-14-2019, 06:01 PM
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If you pull 12v from your 24v system, use the battery that has the actual negative not the battery that has its negative hooked to the other battery’s positive. If that makes sense to you.
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