wturber
1 MW
Warren said:Man, I don't see why you bothered to come on Endless Sphere and ask for folks opinions. You obviously have no use for them. I certainly won't be offering you any more.
Bingo!
Warren said:Man, I don't see why you bothered to come on Endless Sphere and ask for folks opinions. You obviously have no use for them. I certainly won't be offering you any more.
Stu Summer said:Donn, I would sure like to see a photo of your set up. I bought a Ryan Vanguard this summer, already mounted with a 500w cyclone mid drive. I am just about to pull the trigger on a Luna Mac 6t for the front in hope of: 1. raising top speed to 30, especially up gradual hills and 2. increasing stability/decreasing squirrelliness at the front end.
Also, I would love to see how you are going to mount your fairing. I have an old fairing laying around from a df but haven't wanted to spend the time (or money$$$$) on a mount. I have strong experience on my df ebike of the huge effect of the fairing on efficiency and comfort.
The Jumbo Shark battery from EM3EV is rated at 52V, 14.8 amp hours. I'm thinking that should be enough power to get me through the touring day.
Warren said:Man, I don't see why you bothered to come on Endless Sphere and ask for folks opinions. You obviously have no use for them. I certainly won't be offering you any more.
What do you figure for Wh/mile? It's not unlikely I'm confused about something, but my computer is saying 10, and I'm not using it very economically at all. Check my math, but it seems to me that does add up to 75 miles on his battery. Not the way I'm riding, or half the time he'd run dry 10 miles out of town, but it shouldn't be hard to lean that down to 8 Wh/mile or so.motomech said:toureasyman wrote;
The Jumbo Shark battery from EM3EV is rated at 52V, 14.8 amp hours. I'm thinking that should be enough power to get me through the touring day.
Somebody call Guinness.
motomech said:Although technically not totally correct, I go by miles per Amp hour.
Unless the OP is a World class cyclist, the best he will ever see is 2 miles per Amp hour
Motor Type Rough energy usage
Minimal Assist (using motor only on hills, slower ~30kph setup) 6-8 Wh/km
Typical Assist (~40 kph with pedaling, motor on all the time) 9-12 Wh/km
Power Hungry (either no pedaling, or hauling a load, or going really fast) 14-20 Wh/km
Sorry, w/out knowing the Volts of the system, Amps per hour(as you point out) doesn't mean a whole lot..... it would help to know how many volts behind that.
I think Watt/hours more accurately represents range because many(most?)chemistries discharge on a curve, the cells in the lower part of the capacity having less potential energy avail. But as I mentioned, given a large enough pack(15 Ah and above), healthy LiPoly tends to hold to a more linear dis-charge line better than most chemistries, sag showing it's ugly head only @ the very end of the dis-charge cycle.motomech wrote:
"Although technically not totally correct, I go by miles per Amp hour."
Donn commented;
"I don't know why it isn't correct....."
markz said:2 miles per amp-hour just means the rider is just hardly ever giving any power and using leg power all the time. And the power would have to be given not going up any hills, but using it on flats.
http://www.ebikes.ca/learn/batteries.html
1.609344 kilometers = 1 mile
Motor Type Rough energy usage
Minimal Assist (using motor only on hills, slower ~30kph setup) 6-8 Wh/km
Typical Assist (~40 kph with pedaling, motor on all the time) 9-12 Wh/km
Power Hungry (either no pedaling, or hauling a load, or going really fast) 14-20 Wh/km
donn said:I can see I'd better get more experience with my setup before I take off for any long trips. CA seems to be pulling my leg and giving me the idea that I could get twice that much without even being a Neighborhood Class cyclist.
motomech said:Constant 200 Watts rider input(since the OP claims he is a super cyclist)
Hm, hard to say. When I was running that thing for my own purposes I took the "semi-recumbent" option, whatever that means, because I really am not positive I get world class streamlining. Position kind of upright, I'm rather wide, etc. But I see what you mean, the calculator does give a lot of credit to recumbent efficiency - at that 30kph speed, the Wh/mile result more than doubles with upright MTB, and it's easy to see how that would drag down the miles per amp-hour.wturber said:I believe you are getting greater efficiency because you are on a recumbent. Your numbers jibe with the Grin motor simulator.
donn said:I've never been able to measure my own power directly, 100W isn't in the World Class range, is it?
donn said:Hm, hard to say. When I was running that thing for my own purposes I took the "semi-recumbent" option, whatever that means, because I really am not positive I get world class streamlining. Position kind of upright, I'm rather wide, etc. But I see what you mean, the calculator does give a lot of credit to recumbent efficiency - at that 30kph speed, the Wh/mile result more than doubles with upright MTB, and it's easy to see how that would drag down the miles per amp-hour.wturber said:I believe you are getting greater efficiency because you are on a recumbent. Your numbers jibe with the Grin motor simulator.
donn said:markz said:2 miles per amp-hour just means the rider is just hardly ever giving any power and using leg power all the time. And the power would have to be given not going up any hills, but using it on flats.
http://www.ebikes.ca/learn/batteries.html
1.609344 kilometers = 1 mile
Motor Type Rough energy usage
Minimal Assist (using motor only on hills, slower ~30kph setup) 6-8 Wh/km
Typical Assist (~40 kph with pedaling, motor on all the time) 9-12 Wh/km
Power Hungry (either no pedaling, or hauling a load, or going really fast) 14-20 Wh/km
OK, so maybe we're looking at some assumptions about what's typical. That's where my fabulous mileage is coming from: I'm apparently slow. That cuts the load in half on level ground, and about 60% of the Wh/mile. And not working hard - I am using the motor, but only 70-150W. By the ebikes.ca simulator, with a similar setup as mine and no human input, I get 7.5 Wh/mile on the flat and maybe 28 Wh/mile on a 4% grade, at some moderate speed (doesn't seem to matter so much.) On a 75 mile trip with 50 flat and 25 that 4% grade, I'd expect 3.35 miles per Ah, at 52V. If I throw in 100W human power, I get 6 miles per Ah. I've never been able to measure my own power directly, 100W isn't in the World Class range, is it? I could have made a mistake in there somewhere, so check me if it seems wildly off, but I see the OP very possibly getting enough mileage out of his 14Ah x 52V battery for at least some 75 mile trips.
IMO, you are still overestimating what the electrons are capable of.but I see the OP very possibly getting enough mileage out of his 14Ah x 52V battery for at least some 75 mile trips.
wturber said:That's somewhere between 60 and 75 watts per hour depending on how aerodynamic the Easy Racer really is. The biggest issue in this mode of travel would be comfort because you'll be at it for more than six hours.
motomech said:The result of diminishing pack performance plants the seed of less trust and adds to that, pushing the limits w/ little reserve and the shadow of "range anxiety" , that Demon that probably has shadowed most of us here, turning an otherwise care-free(mindless)ride into a worrisome thing.
donn said:Nice - is it an optical illusion, or is the rear wheel smaller diameter?