Alloy Shell 1200w changer on LIPO

[salty]

Has anyone used the bulk charger (alloy Shell 1200w) to charge 4 X 5s zippy or turnigy LIPO packs to make 20s 72v 10amp pack..

two strings in parallel of 4 X 5s packs? charging at 10amps?

will it help to parallel each pack of the string to min charge unbalance?


___Pack 1____ pack2___pack3____pack4____
____| | | | |_____ 72v at 10ah
|___pack5_____pack6___pack7__pack5_____ |


salty

 

[ian.mich]

Has anyone used the bulk charger (alloy Shell 1200w) to charge 4 X 5s zippy or turnigy LIPO packs to make 20s 72v 10amp pack..

two strings in parallel of 4 X 5s packs? charging at 10amps?

will it help to parallel each pack of the string to min charge unbalance?


___Pack 1____ pack2___pack3____pack4____
____| | | | |_____ 72v at 10ah
|___pack5_____pack6___pack7__pack5_____ |


salty

Parallel the discharge wires and balance wires, then buy 4 of these (because you have 4 packs in series) http://www.ebay.ca/itm/200812672679
Set the balancers to discharge to 4.10 or 4.15 (or 4.20 if you're like me ) at this point you'll have a pretty pro LiPo charging setup with that beefy charger, and unbalance will be minimal.

 

[salty]

Hi Ian

Thanks for the info on the balancers ! what discharge power would you recommend? 50w or 150? on the balancers.

what has been your experience on the cycle life on the RC LIPO's ?

I am building a EV bike.. trying to decide between Headman Li fe or Li Po's

it seems the voltage sags more with the Li fe's ?

Have you tried to put a 72v pack of Headman in one of those Falcon bags?

salty

 

[ian.mich]

Hi Ian

Thanks for the info on the balancers ! what discharge power would you recommend? 50w or 150? on the balancers.

what has been your experience on the cycle life on the RC LIPO's ?

I am building a EV bike.. trying to decide between Headman Li fe or Li Po's

it seems the voltage sags more with the Li fe's ?

Have you tried to put a 72v pack of Headman in one of those Falcon bags?

salty

go for 5W, you'll hardly need to balance anyway you can just set these to discharge to 4.10 overnight, once in a while. No way i'm gonna replace my pack in the forseeable future, im probably 25% thru the lifetime. The MOST babied lipos go to 600 cycles, but be happy with 400. Theres no comparison btwn life and lipo, lipos the one to use if ur up to the nerve-wracking first uses. You mean headway correct? Sorry i've never touched headway in my life.

 

[salty]

Thanks Ian

What do you mean by the nerve wracking first uses? is there a conditioning period? when things can go wrong? LIKE FIRE?

should i condition the pack thru a dummy load with a few cycles first. and make sure the packs are at the same state of charge?

Salty

 

[ian.mich]

Thanks Ian

What do you mean by the nerve wracking first uses? is there a conditioning period? when things can go wrong? LIKE FIRE?

should i condition the pack thru a dummy load with a few cycles first. and make sure the packs are at the same state of charge?

Salty

yeah kind of like that. Everyone talks of fire on the forums it's a little scary at first, but its fairly benign if you know how to treat em. Before you start using them you have to put them through a few dummy cycles, and if all the cells stay pretty much balanced (they go a bit out of balance the first few charges) but really only after 5-10 good rides are you totally sure the packs are good. never had a dud myself.

 

[salty]

Hi Ian.

How do you like the performance of your pack? it seems like 90v 15ah right?

great location for the battery. low center of gravity. and low weight 18lb..

did you fill your motor with oil? to help with the thermal load? linseed? I would think there better dielectric oils

great idea tho.

I like the idea to go for a high voltage pack cuts down on the resistive losses..

what sort of speed and range max values do you get?

any issues with your controller?

salty

 

[dnmun]

resistive losses are negligible. that is not why people go to 72V. people go to high voltage to have more top end speed. the controller will convert your 72V to whatever voltage it needs at the time. you just need higher voltage for higher speeds.

 

[ian.mich]

resistive losses are negligible. that is not why people go to 72V. people go to high voltage to have more top end speed. the controller will convert your 72V to whatever voltage it needs at the time. you just need higher voltage for higher speeds.

that. ebikes gain 80% of their top speed very very quickly, so hae=ing such a high voltage and 60A lets me do 0-60kmh in under 5sec. I ran dexron III for 3-4 months and recently opened it up+drained to see if the insulations all good. it was. right now its winter so i'm just running no oil and for customers it's 88V 50A no oil. I might not put it back in because if you leaned the bike on the ground it would come out the vent hole. and yeah I'm loving the FEV frame bag and 21lb 1332Wh LiPo. top speed is 83-84 but i'll never go that high again. controller issues? The controller is an 18fet 4110 with 9awg wires doing 6000W, this baby stays ice cold. range is soooo variable.