Parallel Balance Charging Question

[jlustig83]

Whenever you parallel balance charge a big lipo pack i dont understand how all the cells get balanced the same? Can some one fill my nooby self in on how this works

 

[dogman dan]

Firstly, the charger has the balance tap wires that allows the charger to monitor the battery on the individual cell level. When one cell gets overcharged, the battery then starts discharging a trickle of power from that high cell, while at the same time lowering the amps flowing into the whole pack. Eventually, if it's not to out of whack, the low cells catch up with the high ones.

On a large pack, by connecting the balance wire harness in paralell with another pack, the charge level of one paralell cell will try to match the other, like water seeking it's level in two cups connected by a tube.

With some lipo chargers, the balancing won't work as well with paralelled packs, because the ability of the charger to discharge the high cell gets to be too small. So balancing a 20 ah paralelled pack on a 50 watt charger is not going to work as well as a hyperion charger built to balance a pack faster.

 

[jlustig83]

Thanks. Ok, that sounds great cause i have a hyperion duo 2. If im corect i think i can charge a 44v pack if i series conect the two charge plugs?
But of course all the batteries would have to paralleled then series conected to equal 12s with the same capacity and the balance plugs
would be paralleled, corect?

 

[dogman dan]

You don't have to balance every charge, just when you need to.

Handy tool for it here. http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=14856

 

[jlustig83]

These do basically the same thing dont they? 6S JST-XH Balance Cable for Parallel Charging
http://epbuddy.com/index.php?main_page=product_info&cPath=14&products_id=59

 

[neptronix]

what he said; you don't have to balance all the time. What i do is balance charge my pack to 4.15v, so that i have 0.05v of disbalance leeway in between balance charges. Works for me.

 

[dogman dan]

Yeah, that harness would paralell the balance wires, if you already have the main wires paralelled by another method.

 

[newb]

These do basically the same thing dont they? 6S JST-XH Balance Cable for Parallel Charging
http://epbuddy.com/index.php?main_page=product_info&cPath=14&products_id=59

This guy has them also at $1.00 cheaper and throughs in free shipping (that includes free shipping to europe, at least in my case). Not to mention he really takes care of his customers. Exmaple, I'm Living in europe at the moment and the first order got lost (never arrived) and David took care of it and sent out a replacement. He definetly lost money on this sale but earned a customer for life.

http://www.progressiverc.com/index.php?option=com_virtuemart&page=shop.browse&category_id=14&Itemid=1