fgiroult wrote:Rassy wrote:I would think that fgiroult is using this battery:
http://www.bmsbattery.com/48v/166-48v-1 ... -pack.html
Yes that one precisely. I hope it will keep on performing well (around 2 C constant & 3C burst)... the pack is not getting warm but these last weeks were very cold here and heat was not an issue !
I found out that 30 amps max is what i need for my daily rides in the city, fast enough to ride safe but not reaching dangerous speeds (over 40/45 km/h).
For my next mountain bike project, i'll need more current to get something fun to ride so i might have to deal with lipos
999zip999 wrote:I would like to know how well they hold up at 27-30 amps. Thanks
motomech wrote:Is there a reason that you didn't use the "rack" version of that battery?
Haste wrote:Yeah I want to know how in the world your pulling almost 30 amps out of the 48v10ah batt, with a 20a limiter from the bms lol
cwah wrote:Guys, don't forget the NiCoMn battery are rated 500 cycles at 1C : http://www.ecitypower.com/index.php?opt ... &Itemid=55
If you pull continuously 30A you may end up with much less cycles.
Why not consider the new Zippy compact? It has the same volumetric density (168wh/kg): http://www.hobbyking.com/hobbyking/stor ... _Pack.html
But are rated 25C so you can easily pull 30-40 amps without decreasing the battery number of cycles
Haste wrote:Would the 20ah version fit in falcon ev bag?
48V20Ah battery pack dimensions...
First pack: [ 279 x 178 x 75 mm ]
Second pack: [ 279 x 165 x 75 mm ]
The latest available: [ 300 x 185 x 75 mm ]
The latest detail coming courtesy of Judy Liu [ email@example.com ] and, if accurate, means fitting into the Falcon EV bag would be a literal stretch. A little something to consider.
cwah wrote:Thanks for this good feedback neophyte.
So at 7kg, the 48V20AH battery top at 137wh/kg. That's not bad at all.
Do you do 100% depth of discharge frequently? And how many C do you use usually?
cwah wrote:Yeah, I'm also considering lipo, but they require at minima 15% margin (high voltage / low voltage) capacity.
So a 140wh/kg lipo is equivalent to a 119wh/kg battery. (140wh-15%).
A 160wh/kg lipo is a zippy compact, and 160wh-15% = 136wh/kg usable battery.
The zippy compact would be preferable if they were cheaper. But they are also 20% more expensive than the NMC.
That's why I'm still hesitating
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