1 kWh LiPo club, who's in?

Gio 500+ Shitbucket - 20s3p Turnigy 4s Hardcase 5Ah Packs (x15) - 1.11KWh
 
24s4p here. 6 groups of 4x 4s hardcase packs.
 
c_a said:
pocket: 12s4p of 3.7V/4.9Ah = 870.24Wh
enduro: 24s9p of 3.7V/5.35Ah = 4.27kWh (not mine)
epo-bike 2012: 24s11p of 3.7/5.35Ah = 5.225kWh

total: 10.365kWh
Click to expand...

You're actually being conservative with your volts there. hobbyking is tested to be approx. 3.8v nominal.
Um, anyways you win. There is a club for you and you're the founding father of it.
 
36v 60Ah TSs and 36v 10Ah duct tape pack for a total of..
2772Wh.
But normally just the TSs for 2.16Kwh.
 
neptronix said:
You're actually being conservative with your volts there. hobbyking is tested to be approx. 3.8v nominal.
Um, anyways you win. There is a club for you and you're the founding father of it.
Click to expand...

The real average depends to the load, at 1C 3.8V is possible.

Here you see a logfile from the race in magny cours, channel 4 and 5 are 0.2v lower because there was to much emf from the motor in to the measuring wires, with my load average is near to 3.65V

magnycoursrace.png


anyway, I think that there are some guys which have more capacity :mrgreen:
 
Woah, that is some major, major sag dude. You definitely need more amp hours on that thing, or some higher C cells. 0.5V sag per cell has got to get those packs really hot & you're losing a ton of watt hours..

Admittedly, i run high amp hours & low amp rates usually. 36A peak on a 10S 20C 20AH pack produces an entire 0.75V of sag across the pack, or 0.075v of sag per cell. That's how i get my 3.85v nominal voltage.

I agree that the nominal voltage depends on load. But 1C-2C loads will produce a ~3.85v/cell nominal voltage.. 10-20C will produce something more like 3.6-3.5v nominal voltage.. maybe that is why turnigy rates them at 3.7v/cell.

But do you rate how many kilowatt hours you have based on how much you sag, or do you rate them based on a standard 1-2C load, then talk about how much energy is wasted after the fact?

I'm not sure what the industry standard way of doing this is...
 
The peak load was 360-380Amps out of a 49Ah pack or nearly 8C.

I think the cells where really stable and I got a lot of kwh out of the 5kWh pack and the temperature was not over 38°C.

In my opinion they make a great job, because they are light and rated at 18C only.
 
Ah, that makes sense.

38c is not all that bad if you measured the outside cells. But next time you take it out and romp on it, measure the cell in the middle of each pack. Those heat up more than the ones on the outside of the pack since they have far less cooling surface.

This is why large format lipo cells are not common - can't really push the cells in the middle too hard, they overheat, puff, and go first unless the whole pack is used at a very moderate C rate ( around 1/4th ) relative to it's max C. The larger the prismatic cell, the more you have to derate it, unless you are somehow throwing an air gap between.. then you basically end up getting closer to the volumetric density that cylindrical cells have.. and that sucks.

I really think a lot of these lithium cells are overrated.. over a thousand cycles at 1C or under.. how many cycles at 50% - 100% of the C rate? Bet you'll never see that advertised ;)

Sorry to go off topic.. back to beating our chests about how much lipo we have :lol:
 
6 x 6S 8000mah turnigy bricks (and they are like bricks!!) connected as 18s2p, which in my book is very close to 1.1KWH :lol:
 
Total Li battery:

24s 24Ah Konion MAkita: _2131 Wh
30s 15Ah Zippy packs:____1665 Wh
28s 9.2Ah A123 pack: ____850Wh
16s 15Ah Ping pack: ______768Wh
16s 10Ah Headway: _______516Wh
16s 10Ah Headway: _______516Wh
10s 10Ah Konion Makita:___384Wh
40s 1Ah A123: ___________128Wh

Total: 7kWh

Total Li Charger:

2000W EMC bmsbattery 102V 19A
1500W Meanwell RSP 48V 32A
1000W Meanwell RSP 48V 21A
1000W Meanwell RCP 48V 21A
1000W PowerTen PSU 100V 10A
1000W PowerTen PSU 10V 100A
750W Meanwell RSP 24V 32A
300W Ping 48V
300W Ping 48V

TOTAL Li Charger: 8.8kW
:mrgreen:


Doc
 
He he, entering the 1 kw/hr club in style :D . 24s3p of 50c turnigy nano tech (1332 wh/r, but actually puts out 1425 w/hr at 5c) 88v and 15 sag free ahs. :mrgreen:
 
I think a cooler battery question is, who has a 2kw-hr Nano-Tech LiPo pack, AND exceeds it's rated C-rate. :)

:p :p :p :p :p

It's a lonely club, but it's nice here. :)
 
liveforphysics said:
I think a cooler battery question is, who has a 2kw-hr Nano-Tech LiPo pack, AND exceeds it's rated C-rate. :)

:p :p :p :p :p

It's a lonely club, but it's nice here. :)
Click to expand...

Damn... that sevcon is a beast... Even at peak amp draw I'm only pushing this 15 ah pack at 17c :shock: .
 
1.1 kwh of thunderskys
740 wh of Turnigy lipos
1.1 kwh headway
about 740 wh of lifep04 18650 not sure of brand
SLA's. 960 watts at best @ 20 hr rate..

next on the list is 2kwh of a123's 20 ah cells
 
Update:
5S1P 15/2C 5Ah Zippy FlightMax Qty-84.
Most batteries utilized: 15S26P July-August 2011 -> 63V @ 130Ah = 8.19kWh
Farthest on a single charge with this configuration was 165.3 miles between San Rafael and Fort Bragg, California.

When commuting:
15S6P -> 63V @ 30Ah = 1.89kWh
Range is about 50 miles at WOT (32-34 mph), weather depending.

~KF
 
1.110kwh zippy 20c 5s 3ah packs in 25s 4p config
1.332kwh turnigy 20c 4s 5ah packs wired to 8s first (for easier charging) then 24s 3p
Various loose packs with low/bad cells.
 
I have 1kWh combined LiPo in my house.

15pieces * 22.2V * 5Ah = 1.66kWh

But my bike is only going to run half at a time :?
 
20S2P 5Ah bricks of hardcase turnigy's. :mrgreen: . For when I need the 100 volts of course. I usually run 16-20S
 
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