Battery acquistion!icecube57 wrote:I wanna know where are you sourcing these cells i maybe interested and making a tinkering with this even though I'm on the lipo bandwagon. I just got my icharger so I'm ready to f some s up.... or resurrect the dead... but seriously these laptop cells don't have enough C rating but the way I hypermile and barely sip 1-2A at 20mph I wouldn't mind a small light pack that i could possibly fit in my triangle and have it look stealthy.
Hi DrkAngel!DrkAngel wrote: Hybrid pack!
One of my next trials will be to mate a RC Lipo pack to a recycled Li-ion (18650) pack.
The object being a good surge capability married to a cheap large capacity.
Any surge would be mostly covered by the RC portion, with the 18650 portion offering a modest addition, followed by a gradual replenishment of the RC.
Alternately, blocking diodes could "segregate" - limit battery outputs to the controller only.
Surge output would come from the RC and "normal" drain would come from the 18650's, until voltage equalizes.
Unfortunately, I have no motors requiring more than a 1C output, during surge.
Until ... I stick my ETEK 8-16HP into something, 300A @ 50-60V surge capable!
I was thinking about the same thing but,why not use other 18650 cells more "C" capable (and less capacity) such as those used for power tools (Konion-Makita?). It makes the pairing/pack assembly easier. Those cell should also be safer than rc lipo.
Hi!fredsparkle wrote:I thought I would show my finished battery pack.
For a battery case I used a $8.89 plastic tool box that I got at the local walmart.
Here it is; attached to the cargo carrier on the bike.
After riding for 20 miles I had to remove the battery pack from the toolbox to do some minor repairs. Added silicone separator sheets between the zones after a layer of batteries shifted and had a minor short.
I think using banna plugs and jacks inside of the toolbox gives me some operational flexblity as I can easily take out a zone to revert to 36v from 48v.
More pictures with captions are available at:
https://picasaweb.google.com/fredsRepra ... directlink
Thank you, I looked at your post and it looks great. I will shortly have three battery packs, so being able to swap is good. Also the frame space on my bike is not a neat triange like it is on yours, so really don't have the room.spuzzete wrote: Hi!
Nice job on the battery pack!
However I would suggest to move the battery into the triangle of the bike frame like I did if you have enough room. It's not hard, and the results are amazing, your bike will feel much more safe and balanced to ride. I was having problems with the toolbox in the rear rack, especially on bumpy roads (even small bumps).
You can see what I did on my bike here http://endless-sphere.com/forums/viewto ... 30#p589979 or on my website in the signature.
Update !DrkAngel wrote:A few months ago I "patched" one of my 18650 Li-ion packs with cells of a different manufacture.
All original cells were of same type, capacity and manufacture.
I added a pair of cells to the weak bank of cells.
Non balanced charging still produced good matched voltages at "full" and "empty".
But ... when I did a balance charge, the "patched" bank showed a noticeably higher voltage during charging.
As soon as charging was stopped the voltages were nearly equal.
The problems were that:
1. Charging stopped when the patched bank reached a false "full".
2. If allowed to fully "balance", the patched bank would be noticeably undercharged.
So ... once again ... "best results are obtained using cells of like manufacture, capacity, condition etc."
On the other hand the non balance charging produced excellent results ... no problems!
My "patch" was a bit of an experiment ... with mixed results. 1 more thing learned ...
I will disassemble the weak bank and repair with matched cells.
These were all NEW! Genuine! MeanWells!Kin wrote:I like how you made use of the LED hole
Those little extension coverings are nice, nothing I've seen before on the clone meanwells. An extra touch that makes things cleaner.