How many "useful watthours" do you have?

Get the forum community involved in polls and surveys.
Post Reply

How many "useful watt-hours" do you have?

0-200
2
4%
200-400
2
4%
400-600
14
27%
600-800
10
20%
800-1000
8
16%
1000-1500
6
12%
1500-2000
3
6%
2000-3000
3
6%
3000-4000
1
2%
4000-5000
0
No votes
5000-7500
1
2%
7500-10kWh
1
2%
10kWh - 15 kWh
0
No votes
15kWh - 20 kWh
0
No votes
20kWh - 30 kWh
0
No votes
30kWh - 50 kWh
0
No votes
50kWh - 150 kWh
0
No votes
More than 150 kWh (Explain)
0
No votes
Other (explain)
0
No votes
 
Total votes: 51

swbluto
100 GW
100 GW
Posts: 8231
Joined: May 30, 2008 5:23 pm
Contact:

How many "useful watthours" do you have?

Post by swbluto » Jun 12, 2009 2:51 am

By useful watt-hours, I mean among the batteries that you actually use. I'm not talking about the Lead that you abandoned a year ago, I'm talking about the batteries you use now-a-days.

Also, post if you will, how many watt-hours would you like to have?

I'd like to have 1.5 kWh, so I can get a range greater than 20 miles at 35 mph moped style riding. That'd make riding an electric moped practical. I'm so far only about 500 wh away which is probably less than 300-400 dollars away. I just need to determine how many more watt-hours of the booster pack I need and acquire that, and supplement and reconfigure the capacity packs as needed.

Edit: I just realized I typed in "What many "useful watthours" do you have?". Am I slowly forgetting the constructs of the English language?!
Last edited by swbluto on Jun 13, 2009 1:12 am, edited 1 time in total.

User avatar
Link
100 MW
100 MW
Posts: 2898
Joined: Dec 09, 2007 8:46 pm
Location: The Roxbury

Re: What many "useful watthours" do you have?

Post by Link » Jun 12, 2009 3:59 am

I probably have a useful 800Wh at least in the LiFe pack, but I don't know for sure, since I don't have a meter on it and I'd have to ride too long to wear it out.

I voted 400Wh for the LiPo pack I'll be using soon-ish. Figure 444Wh nominal and I might lose 10% of that on particularly hard rides, so it sounds about right. :?
ಠ_ಠ
Packcycle 2.0 - Scwhinn S-Go
Do you wumbo?
My mind is an enigma. So much so that, sometimes, even I don't know what I was thinking.

User avatar
Drunkskunk
100 GW
100 GW
Posts: 7059
Joined: Apr 14, 2007 11:37 am
Location: Dallas, Texas. U.S.A.

Re: What many "useful watthours" do you have?

Post by Drunkskunk » Jun 12, 2009 3:46 pm

I have 740 WH worth of matched lipo for my bike, though I often run with only 370 watts on the bike. easier to charge only what I need.

I also have a 37V 8AH lipo that only has 50% capacity left, but it's a solid 4Ah battery I use on my other bike. it was made from the cells that didn't puff from 2 packs that died. It could die any day, but it preforms flawlessly so far and weighs less than a 37V 4Ah LiFePO4, so I keep using it.
Buy the ticket, take the ride.
Monster Bike:https://endless-sphere.com/forums/viewto ... =6&t=38667

Mathurin
100 kW
100 kW
Posts: 1178
Joined: May 24, 2006 2:49 pm
Location: Quebec
Contact:

Re: How many "useful watthours" do you have?

Post by Mathurin » Jun 14, 2009 12:49 am

Roughly 300wh of lead, tho it seems I dont ever use that much. Weighs a fuckton, or 1.6 shitloads in USofA units. Could get away with less if my current ebike didn't suck so much.
You have to know, not fear, that someday you are going to die. Until you know that and embrace that, you are useless. - Tyler Durden, Fight club. Ditch the fake identity you've created for yourself, walk your own way in a society of mindless drones to become real, you are not your social status.

User avatar
zenon
100 W
100 W
Posts: 138
Joined: Jun 26, 2008 2:29 am
Location: Vancouver B.C.

Re: How many "useful watthours" do you have?

Post by zenon » Feb 13, 2010 1:14 pm

I have total of 1.7 kilowatt hour of makita's :wink: i could carry on the trike but in most cases i bring 744 watthour of power.
I also always carry a 9 amp charger and top up anywhere i can along the ride. :D
-Home build Tadpole trike with 9C 7turn motor peaks at 2.4 K watt, 54v 18AH Makita lithium packs 63V full charge
Charger - 48V 9A cc/cv power supply upgraded to supply 36v to 63v,
GM controller 36v 32A upgrade to 75V 45A
Top speed 60km/h

kevo
1 kW
1 kW
Posts: 330
Joined: Sep 15, 2009 9:40 pm

Re: How many "useful watthours" do you have?

Post by kevo » Aug 11, 2011 5:09 pm

3 or 4 KW. Usefull is harder, don't always use the various batteries but hope to get more consistent use.
Thanks Justin of http://ebikes.ca for your amazing talents, dedication and contributions to ES!
Post licensed under "Open Source" http://creativecommons.org/licenses/by-nc-nd/3.0/

User avatar
Kingfish
10 GW
10 GW
Posts: 4282
Joined: Feb 03, 2010 11:23 am
Location: Redmond, WA-USA, Earth, Sol, Orion–Cygnus Arm, Milky Way. Age: > yesterday < tomorrow
Contact:

Re: How many "useful watthours" do you have?

Post by Kingfish » Aug 31, 2011 12:08 pm

When I was configured for cross-country I had about 8kWh available; never got to the bottom of that pack as I would employ opportunity charging when the need was desired. For commuting, I run about 1.9kWh.

Best, KF :)
* My 2WD Garden Wall
* Kinaye MotorSports
* Primary ride: 2WD Disc 9C 2806-equiv / Dual Lyen 12FET / 20S7P LiPo.
* Epics: Going to California: 2011 8)
* 50-mph, 101, 10k-Club. 12,527 miles-to-date, 7037 as 2WD.

It is by caffeine alone I set my mind in motion.
It is by the beans of Java that thoughts acquire speed.
The hands acquire shakes, the shakes become a warning.
It is by caffeine alone I set my mind in motion.

bionx 1954
1 kW
1 kW
Posts: 332
Joined: Oct 28, 2009 10:59 pm
Location: ottawa canada

Re: How many "useful watthours" do you have?

Post by bionx 1954 » Sep 07, 2011 9:45 pm

I am running battery packs of 36V Bosch Fatpacks. Each module is 4 BFP (4P) giving 300 watts each. I have 5 modules with 1500 watts of power.

User avatar
amberwolf
100 GW
100 GW
Posts: 25040
Joined: Aug 17, 2009 6:43 am
Location: Phoenix, AZ, USA, Earth, Sol, Local Bubble, Orion Arm, Milky Way, Local Group
Contact:

Re: How many "useful watthours" do you have?

Post by amberwolf » Sep 07, 2011 10:10 pm

So the packs can put out 1500 watts maximum, or continuous...but how many watt-hours (Wh) do they have? Meaning, how long can they sustain that 1500W?

User avatar
biohazardman
100 kW
100 kW
Posts: 1427
Joined: Jun 29, 2008 5:28 pm
Location: Portland,Oregon USA

Re: How many "useful watthours" do you have?

Post by biohazardman » Sep 07, 2011 10:25 pm

I have two packs at 4.6AH and 66V of the a123 so a bit over 600wh soon to be 900 but I don't carry any more than I need so most often run with just over 300wh as it gets me most places I want to go. A little over 1KW would get me 50 miles down the road and I would have not have to ride so conservatively. Still carrying around 21LBS of batts does not sound like all that much fun. Yes I know Lipo is lighter but just by a little and it doesn't last as long.
Build it like your life depends on it. Cuz it does.
Golden Motor Schwinn first build http://goldenmotor.com/SMF/index.php?topic=279.0
Giant BMC build https://endless-sphere.com/forums/viewto ... &start=390
Short ride vids https://endless-sphere.com/forums/viewto ... 60#p321703

cord
10 mW
10 mW
Posts: 25
Joined: Mar 24, 2010 11:53 am
Location: Redmond, WA

Re: How many "useful watthours" do you have?

Post by cord » Sep 07, 2011 10:28 pm

I've got 800Wh of lipo on the bike plus an extra 1300Wh that I throw in a backpack if I'm going on a long trip, although I hardly ever go far enough to need it. I can easily make 15 miles with the 800 hauling ass around town at ~35mph :D

ZOMGVTEK
100 kW
100 kW
Posts: 1217
Joined: Jun 06, 2009 1:40 am

Re: How many "useful watthours" do you have?

Post by ZOMGVTEK » Sep 07, 2011 11:27 pm

My pack is rated at 888Wh, and I can get 750 out of it without complaint.

I'd like 5-10kWh, but I will probably just end up tossing 8 more packs on, for about 1.5kWh useable capacity.

User avatar
amberwolf
100 GW
100 GW
Posts: 25040
Joined: Aug 17, 2009 6:43 am
Location: Phoenix, AZ, USA, Earth, Sol, Local Bubble, Orion Arm, Milky Way, Local Group
Contact:

Re: How many "useful watthours" do you have?

Post by amberwolf » Sep 08, 2011 1:17 am

Hmm...I just realized I never actually posted an answer here:

On CrazyBike2, I used to have about 350Wh usable, with the 36V SLA, 3x 18/20Ah, and that was about 45lbs, with around 8-10 usable Ah, IIRC.

Then I upgraded to a used 48V NiMH, 13Ah (more like 9-10 usable, IIRC), for something like 400-450Wh, for what I think was around 25-ish lbs.

Now it's a used/repaired 48V LiFePO4, originally 20Ah but now around 12Ah, and maybe 25-30lbs, I think (I'd have to weigh it again, I can't remember for sure). It gets around 600Wh of usable power before LVC.

For a time I ran both the NiMH and the LiFePO4 packs, and could switch from one to the other as needed, so the most I've had was about 1KWh on the bike at a time, I guess.

(there is also a 12V NiMH lighting pack on there, of around 8-9Ah usable, but I don't count that in the total as it's not usable for traction due to damage and sag; it's another 100Wh or so, at most, though).

Most of the time, I do not use more than 1/4 of the LiFePO4 pack's capacity, but there are reasonably frequent trips that do use up to nearly all of it; enough to justify having that much (even if it wasn't for the pack type requiring that much just to function as a traction pack for C-rate). It's also nice to not *have* to recharge every time I come home from work, as there are some shifts that are so close together I don't ahve time to do all the other necessary stuff, much less remember to charge the bike. :roll:

Post Reply