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HelicopterMain Discussion › How is parallel charging Safe?
08-29-2012 03:48 AM  5 years agoPost 1
Tbird

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Indiana

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Ok maybe I have thought way to hard about this, but I just do not see how parallel charging gets everything even?

A few of my friends parallel charge, and every time I ask how can it balance each cell even... the answer is "it just does"...

Say you are charging 4 or 6 6s 5000 packs....

2 packs are at 3.87
2 packs 3.9
2 packs 3.6

is it just taking an average and thinking you have plugged in 3.79 ...

I just don't see how this is true and feel like its a risk... please call me stupid lol

EDIT... it wouldn't take an average but the highest cell?

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08-29-2012 03:58 AM  5 years agoPost 2
westwindpilot

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Glendale, AZ

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please call me stupid lol
Stupid

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08-29-2012 04:00 AM  5 years agoPost 3
Tbird

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Indiana

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Thanks

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08-29-2012 04:00 AM  5 years agoPost 4
westwindpilot

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Glendale, AZ

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08-29-2012 04:07 AM  5 years agoPost 5
Tbird

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Indiana

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Ahh good information thanks!

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08-29-2012 04:08 AM  5 years agoPost 6
westwindpilot

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Glendale, AZ

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Hopefully it helped a little bit. There are still things that I dont know but that article helped me out alot back when I first heard about parallel charging.

Steve

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08-29-2012 04:12 AM  5 years agoPost 7
MichiganFlyer

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Lansing,MI

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Once the packs are connected to the parallel board they balance among eachother. While charging the packs charge the lesser charged packs and all come to the same voltage. This is the reason you want them to all be about the same. Transferring a high voltage at a high rate through a balance wire could fry the wire. I love parallel charging myself.

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08-29-2012 04:17 AM  5 years agoPost 8
FireNWater

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Collierville, TN

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.
Ohm . . .
.
It's not just a good idea, its the law . . .
.

Buy Cheap, Buy Twice . . .

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08-29-2012 04:19 AM  5 years agoPost 9
MichiganFlyer

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Lansing,MI

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Resistance.... It is futile!

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08-29-2012 11:47 AM  5 years agoPost 10
Richardmid1

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Leeds, England

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To answer your question yes it averages them out.

3v and 4v packs in parallel become 3.5v each, pack A charges pack B, pack B discharges pack A till they are equal.

It also means each pack gets a slower charge, 6 6s 5000 packs at 1C is 30 amps which would take around 45-50 mins. Try charging them all individually in the same amount of time! You would have to charge each one at about 10C which is just not possible with todays chargers.

60% of the time, it works every time!

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08-29-2012 12:29 PM  5 years agoPost 11
RCHSF

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NC

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Yep, Yep I've not had the pleasure to try it yet. But I know how it's done. Great Post.

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08-29-2012 12:37 PM  5 years agoPost 12
davehour

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Guayama, Puerto Rico 00785

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Hi,

I parallel charge 6S packs for my 500EFL Pro and 600EFL Pro. I like the time saving, plus it works extremely well.

I do have developed some practices:

1. I don't connect packs if the cell difference is more than 0.030V, or if the packs voltage difference is more than 0.2V. If they are off, I charge the lower ones until they are within my specs, and then start parallel charge. I know you can still connects the packs with a bigger difference than what I mentioned but these are my preferences.

2. After the first pack is connected to the charger, including the main and balance connectors, I first connect the main connector of the other packs to be charged, and then the balance connectors. This will equalize the voltage between the packs faster.

3. I leave the packs parallel connected for about two minutes before starting the parallel charge, in order to let them equalize.

4. The chargers balancing circuit load used to balance the cells in the charging process is designed to balance single packs. If more than one pack is connected in parallel, the charger will take longer to balance the cells because it will take more time lowering the voltage of the cells. If I see the cells balance between the packs is off and with a given tendency, I charge the packs in pairs, or alone if the fastest balancing is wanted. After this is done, the parallel charging will be faster because the packs balance will track better. This has to be done in few occasions because good packs keep their balance.

David

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08-30-2012 05:24 AM  5 years agoPost 13
TheWoodCrafter

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Costa Mesa, Ca.

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I do about the same as David.

Except when I get home from a flying day, I storage charge all my packs.
This puts them all at the same voltage for parallel charging the next weekend.

I have 1 Zippy pack that has a lazy cell that I pull out of the paralleled up packs and finish charging it separately.
Or it will slow down the whole thing.

Thanks, TheWoodCrafter

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08-30-2012 09:41 AM  5 years agoPost 14
dialarotor

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Traverse City, Michigan

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So cell 1 & 6 on your 6S pack has gone to kaput

I get these packs from friends, cell 1 & 6 are way off of the other 4 cells and so they dump the pack. I take them, remove cell 1 and cell 6 and clip out the balance leads and now have a nice big 4S pack for my Dynatron Starter. A very well respected pilot told me how he didn't care for parallel charging and that the above situation is what he had experienced many times so he gave up on parallel charging.
Sometimes I get lucky and either cell 1 or 6 gives up first and I only need to remove one cell and I get a 5S pack, that really cranks my Dynatron over for the 90 nitros.

RapRexSynLog Pilot

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08-30-2012 10:01 AM  5 years agoPost 15
3dgimble

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Rochester

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I don't connect packs if the cell difference is more than 0.030V, or if the packs voltage difference is more than 0.2V. If they are off, I charge the lower ones until they are within my specs, and then start parallel charge. I know you can still connects the packs with a bigger difference than what I mentioned but these are my preferences.
Correct, It is bad not to at least do this. Charging should be done within 0.03 volts per cell. I have done it this way and all my packs come out without messing up cells.

Most people do not know the IR of there cells, this seem to cause problems for other packs with higher cell voltage in parallel, one will charge faster than the cell that is para. and stresses the other. It just best to charge like amp packs with about the same cycles with same cell voltage. With my experience its like mixing used Alkaline with new ones in a device.

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08-30-2012 11:16 AM  5 years agoPost 16
heli-cuzz

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Pittston, Pa. USA

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From Revolectrix site

When using Safe Parallel Adapters, can PowerLab see the individual cells within the battery packs connected in parallel?

When two packs are connected in parallel using balance adapters (preferably REVOLECTRIX Safe Parallel Adapters), all of the individual cells are connected together. The PL8 does not see the individual cells any more. But it does not matter. Imagine one cell at 3.8v and another cell at 3.5v. After you connect them together, there is only one voltage, say 3.6v. Current flows between the individual cells to equalize the voltage per ohm's law. The cell with a lower voltage prior to connecting the cells together will receive current from the higher voltage cell (charging the lower cell). Self-equalizing MEANS the cells are self-balancing. Now the PL8 only has to look at each of the the paralleled cell voltages of the pack. By end of charge, the exact same thing is accomplished as what would happen if the packs were charged and balanced separately. There is no dis-advantage to parallel charging from a balancing standpoint.

Fury 55 NIB Furion6 CGY750 fbl helicopter-Frenzy CGY750 fbl nitro-Frenzy fbl NOBAR90

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08-30-2012 01:17 PM  5 years agoPost 17
FireNWater

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Collierville, TN

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.
Ahhhhh, what does a group of guys with EE Degrees, EE Techs with years of designing, building, producing, and servicing hundreds of thousands of chargers for every facet of the R/C hobby around the globe know?
.
My buddy who's been a part-time janitor at the local Elementary School for 20 years says that he ruined a LiPo pack parallel charging!! He has also ruined several other packs single charging, charging on NiCd setting, always flies until low voltage cutoff and refuses to ever storage charge his packs . . . but hey, he TOLD ME that parallel charging is unsafe!! He read it on the INTERNET!!
.

Buy Cheap, Buy Twice . . .

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08-31-2012 01:32 AM  5 years agoPost 18
rpat

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Weirton, W. Va.

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interesting

trex 700fbl cal30,minititan,, trx600fbl,trex250,logo 500,Velocity N2

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08-31-2012 01:35 AM  5 years agoPost 19
MichiganFlyer

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Lansing,MI

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LMAO!

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08-31-2012 01:42 AM  5 years agoPost 20
3dgimble

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Rochester

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How many people own a pl8?
Not sure who firenwater is aming at but
What you read today manuals may change tomorrow, its science so its all best guess. Thank goodness for experience. Take it or leave it. I am not sponsored so one tries very hard not to ruin expensive rc heli stuff that said we should all share our best guess and experience.

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HelicopterMain Discussion › How is parallel charging Safe?
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