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01-14-2006 10:09 AM  13 years ago
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Riverman

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Peace River, Alberta

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Paralleling Lipos
Hello

I have two 3 cell gen II Thunder Power 1320s that I wish to run in a heli with a 200watt brushless motor. I have found that using one pack alone is a little too taxing on it. I was hoping to parallel the two packs together to split the current between them.
I realize this is basic electronics. However these lipos scare me a little. Can anyone see a problem in what I am proposing? BTW, I intend to create the wire harness so that the two packs can be disconnected and charged seperately.

Thanks for any help, Brett
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01-14-2006 11:35 AM  13 years ago
tean

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Gloucestershire,UK

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Hi,
I've been using parallel packs for some time with no problems, but I would advise you to keep them permenantly connected an charge them as one large pack. That way the charge will be correctly distributed between the cells. Make sure the charge level is the same in both packs before connecting them, and check that no large currents flow when you first connect them.
It is more technically correct to parallel each of the cells in the two chains rather than just paralleling the ends of the chains, but this would mean stripping down the packs in order to do the wiring.
The only real disadvantage of just paralleling the chains is that you should really split the packs when you want to use a balancer.

regards
Andy

.
Logo14 Vbar, Logo500 CSM flybarless, Trex 600 CSM flybarless, 3DMP, Logo10, Lipoly, Mini T, .......
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01-14-2006 07:39 PM  13 years ago
Riverman

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Peace River, Alberta

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Tean

I use a 3 cell balance charger and I think that charging the packs in parallel together might be detrimental. Don't you agree?

Brett
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01-15-2006 08:43 AM  13 years ago
Hoverdown3K

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Rochester, New York

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That is how I fly my Voyager E, I use 3 x 3s lipos in paralle!!-= I know there is Money in RC helicopters. I put it there=-
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01-15-2006 08:59 AM  13 years ago
tean

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Gloucestershire,UK

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Hi,
If you use a balancing charger that charges through the balancing connector, I think it'll get confused if you charge two paralleled packs with it. I'm not certain as I've never used one of these chargers. It might work, but it would hardly be best practise. I think you'd be better to either strip the packs and connect the cells into a proper 3s2p pack or charge the packs separately.
If your soldering is up to it, I'd recommend the former because you will be able to charge in half the time and there is no chance of connecting the packs together when one is charged and one is flat. If you want to keep the packs separate, I'd recommend checking the pack voltages before connecting them together to check they are the same.

Andy

.
Logo14 Vbar, Logo500 CSM flybarless, Trex 600 CSM flybarless, 3DMP, Logo10, Lipoly, Mini T, .......
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01-15-2006 09:09 AM  13 years ago
Lorents

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Oslo, Norway

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Hi,

I have connected two 3S1P packs together by paralleling the main leads and using a Y harnes to connect the two balancing plugs - much easier and it should be the same as rewiring the whole pack. Also you have the flexibility to disconnect them and use the packs as 3S1P.

Just make sure that all the cells have the same voltage before connecting them


What comes around goes around.
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01-16-2006 09:12 PM  13 years ago
Riverman

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Peace River, Alberta

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Hello

I guess I should of stated originally that although I want to use these two packs in parallel on my larger heli, I still want to be able to use the packs independently in my Blade CP.
Tean: you deffinately bring up a valid point about connecting the two packs together in different states of charge. I guess I'll just need to be careful.

Lorents: I like your thinking but I'm not sure about balancing in parallel. I also have two 1.0amp chargers so it makes more sence for me to charge the packs seperately.

Thanks for all the valuable info everyone.

Brett
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01-16-2006 09:17 PM  13 years ago
Dr Lodge

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Guildford, Surrey - UK

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Lorents states he is
using a Y harnes to connect the two balancing plugs
- same as me ie
- connect both main leads together using Y harness
- use balancing lead harness to connect both balancing outlets together
- connect a single balancing unit.

This is essentially the same as balancing a factory built '2p' unit.
Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200
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