Comments on: Connecting Batteries in Series and Parallel at the Same Time

By: David

David — Fri, 13 Jan 2012 08:10:38 +0000

Thanks for the articles, they make for good geeky reading.

I have a question if anyone can help me.

I have a 12vDC starter motor that I want to put onto a gocart, I have several 7ah SLA 12v batteries, these are free for me so I will use them for now while I am learning, apparently this motor is rated at 19 amps, I think anyway, my question is If I setup my batteries 2 groups of 2 wired in series and parallel I will get 24volts at 14 ah, correct? so if I use your numbers ( 14ah * 90% = ?ah / 20 amps = ? hours * 60% = ?hours )

I think I got about 12 minutes run time with no load, Can you please advise if I have done this calculation correctly?

By: Michel

Michel — Sat, 01 Oct 2011 16:09:31 +0000

I have 4 12 volt batteries to get 48 volt for a scooter.

Can i connect these 4 batteries in parrallel and series as in Larry’s example and then charge them with one 12 volt charger ?

By: Robin

Robin — Tue, 13 Sep 2011 05:21:44 +0000

Yes.

By: Pieter Senekal

Pieter Senekal — Tue, 06 Sep 2011 10:35:44 +0000

I have 4 12 volt batteries in serie to get 48 volt for one system. Can i connect the same 4 batteries in parralell to get 12 volt for a diffarant systym?

By: John

John — Sat, 06 Aug 2011 00:17:33 +0000

Sorry but couldn’t find where to post this question. If I connected a 24 volt wind generator to a 48 volt battery bank what would happen? Would I put in half the energy or would I destroy the Wind generator????

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Thu, 26 May 2011 00:28:03 +0000

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By: Kevin

Kevin — Tue, 03 May 2011 17:15:39 +0000

From what I understand, If you take 20 of your batteries say 5 rows of 5 labeled as R1-5(Rows) and C1-5 (Columns). Connect all of R1 negative terminals together. Then connect all R5 positive terminals together.Thus creating a paralleled type connection for combined amps. Then connect R1C1 positive terminal to R2C1 negative terminal and continue to do connect the batteries in this fashion for each column. This is an example of a series connection. Once you have set up the first “set” of batteries, create an identical connection with the other 20 batteries. Once you have two identical battery “cells” connect them in parallel to each other. Connect the positive of R1C5 from one “cell” to the positive terminal of R1C1 on the other “cell” that you made. Then connect the negative terminal from R5C5 from one “cell” to the negative terminal from R5C1 on the second “cell”. This should give you a combined total of 24v at 48,800 amps. I don’t know where to do from there or if this is even correct, so don’t do it until Robin looks my plan over. I did a drawing but can’t post it in the comment.

By: Reg

Reg — Thu, 29 Jul 2010 13:52:37 +0000

Robin, I’m looking at a larger installation of battery back-up and considering using 40 x NiFe 1.2V battery array with each battery rated at 1220 Ah. This is for a large villa that is off the grid in Bali. We will have a 100Kva genset integrated in the system which should cover any power needs that arise, but I want to maximize on usage of the batteries to reduce gen-set time. How would you go about configuring the system for max amp hours? Would you series them up for 48volt system or do a series/parallel configuration and 24volt system? Any suggestions you have would be appreciated.

By: Robin

Robin — Wed, 07 Apr 2010 14:22:58 +0000

Trevor, you can't put them in parallel as well. What you are trying to do is important though; load equalization when drawing 12 volts off the "low side" of a 24 volt cell. You either need to draw 24 volts and transform that down to 12 (your transformer needs to be rated for the current drawn by your TV), or else draw 12 volts from the low side and install a battery equalizer that shifts voltage between the two batteries to keep them on equal voltage. Take a look at this article I've written on installing a battery equalizer.

By: Trevor

Trevor — Wed, 07 Apr 2010 06:23:39 +0000

I want to run a low power 24volt lighting system and a low power 12 volt TV off two 12v 110a batteries.
Both batteries in series for the lights – fine.
But can I also put the batteries in parallel to run the tv? Parallelled so that they are used equally.