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05-02-2005 08:49 PM  12 years agoPost 1
demosa

rrVeteran

Tigard, Oregon, U.S.A.

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Hi guys,
I posted this in the "batteries" section but got no answer
so I'll try it here as well ...

I just received my 2 new TP2000-3s ProLites.
I plan to use them in a 3s2p configuration.
I plan to charge them separately. Once charging is
complete can I just hook them up in parallel right away ?
Or do I need to wait until they both stabilize at the same
voltage ? What if their voltage is not exactly the same ?

Also can I charge them both while they are connected in
parallel ?

Any help will be appreciated !
Thanks,

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05-02-2005 10:05 PM  12 years agoPost 2
Ben-T-Spindle

rrProfessor

Central Illinois

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I am not an expert but I would think that it would be much better to connect them in parallel when they are discharged. First get the voltage as close as possible – probably 3.7v or less at rest would be good. That way any difference in voltage would not generate that much current. Then charge them after they are connected. You should probably never separate them so both halves always stay at the same voltage.

The real experts are at the Ezone forum – try posting your question there http://www.rc-groups.com/forums/for...?s=&forumid=129

.

... BTS

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05-02-2005 11:56 PM  12 years agoPost 3
CustomPC

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Sydney, NSW - Australia

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It is my understanding (and i may be wrong) that packs connected in Parallel will equalize to the same voltage.
ie, the higher voltage pack will drain into the lower voltage pack until both packs are equal voltage.

Packs connected in Series will not equalize so you should always make sure both packs are the same voltage if charging as a complete pack.

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05-03-2005 12:43 AM  12 years agoPost 4
HugeOne

rrKey Veteran

Quebec, Canada

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I run on home made 3S2P 8000mAh packs. Before paralleling my cells (4000mAh) I bring them to 3.50V, then I solder the tabs. Once I have my 3 8000mAh single pack I solder them in series. After the pack is finished I charge it until nearly full, then I charge each 8000mAh "pack" independetly by the way of a 2 equalizing tabs soldered to the middle cell. I just hook a aligator clip on one side of the dean connetor and the other to my equalizing tab to charge the first cell. My cell are not "matched" so I have to equalize them very often. So at my opinion/experience when paralleling 2 or more cells they become one.

Raptor e620 w/V-bar, Tango 45-06, Phoenix 85HV, TrueRC 12S1P 4000mAh

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05-03-2005 07:06 AM  12 years agoPost 5
Lorents

rrElite Veteran

Oslo, Norway

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Hi,

I have 2 Apogee 3S 2480 packs that I run in parallel. I always connect them together when they are fully charged, just before I am going to fly, and I disconnect them afterwards and charge them seperately. When the packs are charged there is a voltage difference of 0,03 between them.

Lorents

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05-03-2005 06:53 PM  12 years agoPost 6
demosa

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Tigard, Oregon, U.S.A.

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I'm curious ... How is a 3s2p pack wired ?

option 1
connect in parallel two cells, repeat three times then
connect in series the three pairs of cells

option 2
connect in series three cells, repeat two times then
connect in parallel the two groups of cells

Is one option better than the other ?

Thanks !

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05-03-2005 07:19 PM  12 years agoPost 7
Ben-T-Spindle

rrProfessor

Central Illinois

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Most factory packs are option 1 – that is the best way to do it. You have to check the three blocks once in a while to make sure they are in balance (or use a charge balancer).

Option 2 works well but you have to check the individual cells more often to make sure they stay in balance (and there are twice as many to check).

All the major manufacturers will have balancers available in the near future and they are designed to work with configuration 1 packs.

... BTS

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