pwd wrote:First off, I just want to say how great this forum is; very knowledgeable. I've been reading posts on ES for about a year now.
I would like to build my own pack with some Lipo backs; however I am very new to this and don't have a great understanding of batteries/electrical components. I was hoping this forum could help me decide if I should build my own; or go back to a pre-made; nicely packaged battery. Here is what I currently have:
Ideally, I want to replace my Golden Motor 48V 12ah Lithium Manganese battery as it appears to have some damaged cells and is cutting out on me. The challenge for my build is that I'd like it to be as portable and simple as my GM sliding battery is and have a bit more power.
From my understanding on here: http://www.endless-sphere.com/w/index.p ... ttery_Pack I will need the following components:
a bunch of Lipo Packs
some sort of low voltage cut-off
extra care to not discharge below ~3.0V and not to charge past ~4.15V
I need to meet these specs:
compact (needs to be roughly the same size as my GM pack)
simple (somehow rig up a case for bulk charging and have to ability to charge each pack for balance charging; as well as a charger that isn't too bulky)
portable - the packs need to be easily removed from bike to bring inside as I store my bike outdoors
Anderson connector to GM magic pie
max Continuous discharge of 60 amps (Dual Magic Pies on max amp setting: I can live with max continuous of 30A which would be dual Magic Pies at %50 amp setting)
absolute maximum of 59.9V (Magic Pie will not function over this amount)
something with more than 575 watt hours (what my GM pack is supposed to provide)
can it handle regen from both Magic Pie controllers?
Here is where I was going to start:
http://www.hobbyking.com/hobbyking/stor ... _Pack.html
(7S 25C 5000mAh Zippy Compact)
Would it be possible to have 6 of those packs and wire them 2 Series X 3 Parallel?
That would give me a setup of 51.8V and 15 amp hours
This is what you would call 14S3P right?
The part I'm really lost on is the charging:
What kind of charger/balancer would I need?
Is there any that have a built in power supply?
Thanks for your time.
docnjoj wrote:I believe that the 7S plugs would fit in a Hyperion 1420i but am not sure since the plug may have to be slightly modified. The Hyperion can take 14S for both charge and balance. they have come down in price and i am seriously thinking of getting one. Many folks use 6s and series 2 of them after paralleling 3 batteries. The hyperion needs a separate power supply though. Good to see you posting again pwbset.
Whoops! I messaged the wrong person. Sorry pwd
999zip999 wrote:A separate supply of 12-17v volts to power the charger.
motomech wrote:You could gut the GM case and fit 4 of the new compact 7S 5800 mAh inside giving you 14S 11600 mAh while retaining the fuse and switch from the GM batt.
dogman wrote:Or you could do a series paralell harness type rig, and use an 8s charger.
wesnewell wrote:All those 7s HK bricks are pretty much worthless since they split the balance leads into one 4s and one 3s instead of using one 7s balance plug. WTF were they thinking? Just plain stupid. To use with a 14s charger like the Hyperion 1420i you have to have two 7s plugs. One per 7s brick of lipo. So, you'll need to cut the 2 balance plus off and wire them to one 7s plug on each 7s brick. 7s (8 wire) plugs with wires are available on ebay so you won't have to make the connectors up, just re-wire the wires. BUT, it will be just as easy to do using separate 3s and 4s bricks, or 2s and 5s, and then tape them together. What a shame they screwed this up so bad.
pwd wrote:Also, when buying a charger or balance cable etc... when is says it does 8S, does that mean it will still work with anything UP TO 8S? (includes 2,3,4,5,6,7 and 8S) And a 14S charger would do anythin UP TO 14S?
So because those packs have two balance leads... I can't just plug the 3s lead the 4s lead from the same 7S pack into a 7s port? I apologize if that seems like a basic question; but I just started reading about LiPo packs the last few days and want to make sure I understand that correctly.
pwd wrote:My question is, can I bulk charge my 14S3P pack on the iCharger 206B?
wesnewell wrote:pwd wrote:My question is, can I bulk charge my 14S3P pack on the iCharger 206B?
For 14s you need 58.8V for full charge. You need the Hyperion 1420i to balance or bulk charge the whole pack at once.
recumbent wrote:I bulk charge my 14s 3p lipo with a "BMSBattery" lipo charger, and it works excellent.
One pannier has 8s cells in parallel, and the other has 6s cells in parallel, and it all balances great for the past 4,000 kms. And it's also wired with my CA to monitor voltage and such as i charge. Hope this helps, as i did not read the whole post.
dogman wrote:Re the 206 b. The key thing here is the 6. It's a charger for 6s lipo. You bought 7s cells right? so you have one more cell per pack than the 206b can charge.
If you get an I charger, it has to be capable of at least 7 cells, so the 1010B would do that. You could split the pack in half, and and charge each half. Or paralell connect the two halves with an adapter you made, and charge the whole thing as a 7s pack.
Since you currently know so little, I hope you do your bulk charging in a place that won't burn the house down.
To safely bulk charge, the best method known at this time is to use these hvc lvc boards,
http://www.methtek.com/2012/02/05/compl ... ction-kit/
plus a charger set to your packs voltage.