I'm ready to go lipo, but need advice

Batteries, Chargers, and Battery Management Systems.
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MrKang   100 W

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Re: I'm ready to go lipo, but need advice

Post by MrKang » Oct 19 2010 7:44am

Good job ! you are on your way to lipo world !

I can't wait to see some pics of your total setup/creation

ps. why didn't you order a power supply at HK ?
MrKang E-Scooter : 24V 750W Bosch Motor modified with YK-43 48V 1kW on 12S6P Lipo - top speed 44kmph
Xinling XTD800A : LYEN 4110 72V (modified for safe 100.8V with extra cooling) - 24S4P/100.8V 25Ah Turnigy + CA with Datalogger + SOUNDSYSTEM + USB power outlet + 78km top speed(120%)
MrKang Retro II : in progress.. ** 12FET MKII LYEN + 28S 20AH LifePO4 cells **
Project link [/color]: http://endless-sphere.com/forums/viewto ... 10&t=13442

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mud2005   10 kW

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Re: I'm ready to go lipo, but need advice

Post by mud2005 » Oct 19 2010 2:16pm

MrKang wrote:ps. why didn't you order a power supply at HK ?
I thought I had read the HK power supplys were junk. maybe I'm wrong, but anyway I ended up buying this power supply for the charger. http://www.progressiverc.com/index.php? ... t&Itemid=1
its more $, but it should last forever :D
Future's all yers ya lousy bicycle!
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number1cruncher   1 kW

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Re: I'm ready to go lipo, but need advice

Post by number1cruncher » Oct 19 2010 2:41pm

mud2005 wrote:ok, I'm thinking about this more and trying to wrap my head around some concepts.
hypothetical question: so if I have 2 6s packs wired in parallel and say the voltage on cell 4 is low because cell 4 is going bad, will cell 4 on the other pack also have low voltage even if it's not going bad? I mean will the cells auto balance themselves and always have the same voltage :?:
the reason I ask is because I am wondering if there is any situation where not paralleling the balance leads and using one cell-log per 6s pack would make it easier to locate a bad cell? or balance the cells.
in other words, in a situation where a cell is going bad, if I'm using the cell-logs as an alarm for low voltage on a single cell and the leads are paralleled how will I know which of the paralleled cells is the problem? :?:
maybe I should be asking if it's possible for 2 cells in parallel to go out of balance?
Paralleling the balance taps combines each cells capacity and hopefully increases that groups resilience. Otherwise, a weak cell has more of a chance to collapse.

However, I have wondered what effect a poor cell has on a good cell. When I have found these combonations in the past, it seemed one cell was low, while the other was high. Sort of a recipricle relationship. Can't be good for it, is my instinct. I have found it useful to leave the balance taps unconnected to trace problem cells, but usually leave them paralleled in normal operation.

Welcome to the Lipo addiction!
Go to http://www.ebike.ca and buy stuff to support the rEVolution!

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mud2005   10 kW

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Re: I'm ready to go lipo, but need advice

Post by mud2005 » Oct 27 2010 11:43pm

HK has issues. :roll: when I ordered my batteries it said they had 10+ in stock. I paid for the fastest air shipping hoping they would be here in a week.

I checked HK site daily to see if the order shipped. it said "prossesing" for 1.5 weeks. finally it informs me the batteries are "temporarily out of stock due to factory error"

I got the option to either cancel the batteries and receive the rest of my order with no shipping discount or cancel entire order and get a refund IN POINTS. great, so they screw up and I get store credit. :roll:

anyway, I reordered the same stuff, but this time went with nano-tech :mrgreen: bwaaahaaaaa

$ also, I noticed that if I wait a few minutes on some HK product pages a note pops up in the lower right corner saying something like "having troble deciding, try this discount" and it offers the product at a lower price. :mrgreen: the nano-tech were <$100 for 6s1p 6000mah
Future's all yers ya lousy bicycle!
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Butch Cassidy and the Sundance Kid

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MrKang   100 W

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Re: I'm ready to go lipo, but need advice

Post by MrKang » Oct 29 2010 1:02am

mud2005 wrote:anyway, I reordered the same stuff, but this time went with nano-tech :mrgreen: bwaaahaaaaa
Now were talking! :twisted:
MrKang E-Scooter : 24V 750W Bosch Motor modified with YK-43 48V 1kW on 12S6P Lipo - top speed 44kmph
Xinling XTD800A : LYEN 4110 72V (modified for safe 100.8V with extra cooling) - 24S4P/100.8V 25Ah Turnigy + CA with Datalogger + SOUNDSYSTEM + USB power outlet + 78km top speed(120%)
MrKang Retro II : in progress.. ** 12FET MKII LYEN + 28S 20AH LifePO4 cells **
Project link [/color]: http://endless-sphere.com/forums/viewto ... 10&t=13442

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liveforphysics   100 GW

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Re: I'm ready to go lipo, but need advice

Post by liveforphysics » Oct 29 2010 3:42am

mud2005 wrote:anyway, I reordered the same stuff, but this time went with nano-tech :mrgreen: bwaaahaaaaa

Hidden blessing. :)
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dogman dan   100 GW

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Re: I'm ready to go lipo, but need advice

Post by dogman dan » Oct 29 2010 6:07am

You really wanted those anyway. 8) Just don't do the pay later thing. :) Not a bad idea though, to watch the stock levels, and patiently wait for a restock. Then pounce on it.

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mud2005   10 kW

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Re: I'm ready to go lipo, but need advice

Post by mud2005 » Nov 05 2010 12:01am

new toys arrived today :mrgreen: now I just have to figure out how to use them
206B icharger
turnigy watt mater
kill a watt meter
48V meanwell
12V power supply
2 cellog 8m
2 magicshines
2 dc-dc converters from Lyen
4 6s 6000mah nanotech packs
and a bunch of that cool flexy wire

I plugged a cellog into each pack to check to voltages
3 packs were 3.83V for almost every cell and a couple were 3.84V
the forth pack had cells from 3.80-3.83
seems pretty good to me :D

now I just have to build a pack. get ready for a bunch of noob questions as I have never built or charged a lipo pack before and I really don't want to short anything out.
lipo.JPG
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Future's all yers ya lousy bicycle!
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MrKang   100 W

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Re: I'm ready to go lipo, but need advice

Post by MrKang » Nov 05 2010 4:03am

It's always a nice picture to see your goodies all on the table !

Ok...question...did you have the male 6S connectors and bulletplugs to parralel your two 6S lipo's ?

i don't see them on your shopping list..this you need to configure your 12S2P pack..

anyway...charge your lipo's one by one with the icharger set on a 6S pack with a current of 1A Balanced mode

This way you are sure that all 4 packs are nicely charged with the same cell levels.

after that you can make your balance parralel wiring and your parralel tap for the power leads.
MrKang E-Scooter : 24V 750W Bosch Motor modified with YK-43 48V 1kW on 12S6P Lipo - top speed 44kmph
Xinling XTD800A : LYEN 4110 72V (modified for safe 100.8V with extra cooling) - 24S4P/100.8V 25Ah Turnigy + CA with Datalogger + SOUNDSYSTEM + USB power outlet + 78km top speed(120%)
MrKang Retro II : in progress.. ** 12FET MKII LYEN + 28S 20AH LifePO4 cells **
Project link [/color]: http://endless-sphere.com/forums/viewto ... 10&t=13442

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mud2005   10 kW

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Re: I'm ready to go lipo, but need advice

Post by mud2005 » Nov 05 2010 4:27am

MrKang wrote:Ok...question...did you have the male 6S connectors and bulletplugs to parralel your two 6S lipo's ?
I knew I'd miss something :roll:

I do have plenty of bullet connects, but I did not get any male 6s connectors. do you have a link to the right connectors? I'm not sure what all else I still need.

do I need to make a wiring harness like on this site? http://www.rchelicopterfun.com/parallel ... rging.html
harness.gif
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thanks much
Future's all yers ya lousy bicycle!
-Paul Newman
Butch Cassidy and the Sundance Kid

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number1cruncher   1 kW

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Re: I'm ready to go lipo, but need advice

Post by number1cruncher » Nov 05 2010 12:59pm

If you can solder, buy these http://search.digikey.com/scripts/DkSea ... 55-2252-ND (you will still need one male connector) and solder to this http://www.radioshack.com/product/index ... Id=2102846. I cut the board up to reduce size. Or you could buy a couple of Gary's lvc boards instead of the RS board. You do not NEED to parallel the balance taps, but it is HIGHLY advised. Good Luck!
Go to http://www.ebike.ca and buy stuff to support the rEVolution!

Electra Townie 700c Euro 8i - 20s2p Zippy LiPo - Rear 9c clone
Performance x201 - 18s2p - Rear 9c 8x8

All things lead to the path of least resistance.

"Political correctness is tyranny with manners." ~Charleton Heston

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Re: I'm ready to go lipo, but need advice

Post by texaspyro » Nov 05 2010 3:10pm

mud2005 wrote:new toys arrived today :mrgreen: now I just have to figure out how to use them
No you don't. Just send it all to me and I will figure it all out. Should be able to report back to you in a couple of gigaseconds... :twisted:

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Re: I'm ready to go lipo, but need advice

Post by tysonmotorcycle » Nov 11 2010 12:01am

Hey there Mud,

Thanks everyone for this informative post; I'm doing something similar.

Let me see if I have this straight:
Are you planning to use the icharger/12v supply combo only to initially charge and balance each of the 6s packs before you build them (and occasionally re-balance?) If so, what the heck is the meanwell for? I assume once they are installed as 12s packs, you'll use the meanwell to charge as a full pack at around 7A? If so, are you leaving the cellogs installed as you charge and only charging to, say 49.8v? I'm probably wrong about that, but if so, isn't there a mode on the icharger to bulk charge the pack in the same way at closer to 20A?

This seems like a good way to simplify the charging process; I like having a simple power supply to charge daily, (only one thing to plug in) and a balance charger to use every once in a while to put the cells back in balance if need be.

thanks for setting me straight..

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mud2005   10 kW

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Re: I'm ready to go lipo, but need advice

Post by mud2005 » Nov 11 2010 1:17am

tysonmotorcycle wrote: I'm probably wrong about that, but if so, isn't there a mode on the icharger to bulk charge the pack in the same way at closer to 20A?
I bought the 206b icharger which can only do 6s.

I've been working long days since I bought the batteries and haven't even taken them out of the box yet :oops: I want to solder something right now, but too tired to do anything but watch a movie and go to bed.

I don't have a good plan yet for charging the batteries. I'm first going to mess around with the icharger and go from there.
Future's all yers ya lousy bicycle!
-Paul Newman
Butch Cassidy and the Sundance Kid

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mud2005   10 kW

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Re: I'm ready to go lipo, but need advice

Post by mud2005 » Nov 29 2010 8:04pm

think I have the final pieces of the puzzle. got 2 parallel adapters for the balance wires and a fireproof charging/storing bag :D
battery_bag.JPG
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