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The more packs you charge in parallel, the more you should make sure that the packs do not differ in state of charge. Life expectancy is not influenced in any way. Quote:
As a kid I found an ammo box of the german Wehmacht, perhaps I will use this as a charge bunker, should I get into frequent LiPo charges next season. At the moment, I almost only charge A123. |
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Last edited by Julez; Oct 26, 2008 at 10:24 AM.
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Yes, this should certainly be possible.
Just think what would happen if you replace the 1500mAh pack with 3 pieces 400mAh packs. You'd have about the same capacity, but I see no reason why one particular pack should overcharge. Now if you combine the 3 400mAh packs into the 1500mAh pack, there is still no reason why the 400mAh pack should overcharge. |
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On my setup it will only balance all the cells if I charge in series.
I think it's because of the type of charger I use? I'm using a Turnigy Accucell-6 charger with a CCB-723TPQF board . http://www.hobbycity.com/hobbycity/s...CB-723TPQF.jpg If I try and charger in parallel ( say , two 3 cell TP 1320 ) using this setup the charger will only show that 3 cell are being balanced not 6 cell. So I guess I would have to have a charger that charges using the balancing taps to charge in parallel ? DanT |
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Attached is a photo of one of my parallel cable sets in action. Mark |
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mrforsyth,
Are you saying you don't use a separate balancer after charging in parallel? Not even once in a while? Do you use the packs individually or all together? |
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My packs are discharged individually. Voltage after discharge is typically around 11.3-11.5V. Also, I frequently charge 3S 5000mAh packs in parallel with 3S 2100mAh packs. As they're in parallel and at the same voltage, this is completely safe. Mark |
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One can charge 100 pieces of 3s packs in parallel, but the charger will still only "see" 3 cells. |
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This is a great thread julez - very well done the pictures are great too!
So really what is happening here is that, with for example 2 x 3s packs connected in parallel, and the balance connectors also paralled ( in the right configuration of course ! ) the charger sees 1 big 3s pack, and although it also sees 3 cells in that pack, each cell it "sees" is really 2 x cells connected in parallel, and we are relying on the fact that each pair of cells will even each other out and therefore be balanced ? I think you are also saying that packs of different capacities are also fine to do like this ( same cell count of course ) and they do not necessarily have to be at the same state of charge when they begin charging. ? I am going to make up the balance plug parallel connector PCB that you show, and laso parallel the main leads too because I am likely to be charging like this - but at high rates so the balance wires will be unhappy with large charge currents. Again...nice one Julez!! |
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I personally prefer to have all of the main connectors handling the charge current and use the balance connectors to monitor individual cell voltage and provide balancing. Not entirely necessary, just my preference. |
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