999zip999
100 TW
I would like to know how well they hold up at 27-30 amps. Thanks
Is there a reason that you didn't use the "rack" version of that battery?fgiroult said:Rassy said: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
Fred
I'll give an updated status in few month - i'm trying to keep tracks of the charge cycles999zip999 said:I would like to know how well they hold up at 27-30 amps. Thanks
My initial plan was to fit the battery inside the bike's frame for a weight balance issue and the form factor of the shrink wrap version is appropriate. After some testing i changed my mind : i just drop the battery in one of my bags on the rack. It doesn't make lot of difference, as it is really light. But if you look at 15 or 20 Ah packs you should consider rack version (+ ability to lock the battery on the bike)motomech said:Is there a reason that you didn't use the "rack" version of that battery?
Specs give 20A continuous & 40A max - i read somewhere that the bms on this pack was upgraded recently to reach 40 (i 'll try to find the source of this info) Also the value i reported is peak value onlyHaste said: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 said:Guys, don't forget the NiCoMn battery are rated 500 cycles at 1C : http://www.ecitypower.com/index.php?option=com_content&view=category&layout=blog&id=34&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/store/__21384__ZIPPY_Compact_5800mAh_7S_25C_Lipo_Pack.html
But are rated 25C so you can easily pull 30-40 amps without decreasing the battery number of cycles
Haste said:Would the 20ah version fit in falcon ev bag?
Neophyte said: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 [ bmsbattery@gmail.com ] and, if accurate, means fitting into the Falcon EV bag would be a literal stretch. A little something to consider.
cwah said: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 said: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 :lol: