Search found 216 matches

by donn
Apr 22 2019 9:16am
Forum: E-Bike General Discussion
Topic: Casual Commuter Recommendations
Replies: 24
Views: 408

Re: Casual Commuter Recommendations

How are you going to monitor charging? You're thinking of the over-charging problem? - chargers typically shut off on their own at a full charge voltage, but the battery life will be a lot longer if you can stop at 80%? Just to clarify, as that may not be common knowledge among people shopping for ...
by donn
Apr 22 2019 9:06am
Forum: E-Bike General Discussion
Topic: Casual Commuter Recommendations
Replies: 24
Views: 408

Re: Casual Commuter Recommendations

But if you get that 48v kit,, you will NOT ride 20 mph. You wont.. you'll ride 25 mph or faster. It will shorten your range, and force you to buy a 20 ah battery at least.. So till you can spend a thou.. DONT buy a 48v kit. Trying to figure out why my experience is so different, and my guess is tha...
by donn
Apr 21 2019 3:01pm
Forum: E-Bike General Discussion
Topic: Casual Commuter Recommendations
Replies: 24
Views: 408

Re: Casual Commuter Recommendations

So, you can get a basic e-bike for $550-$650 if you shop carefully Not including the price of the bicycle itself, though, right? The 48v 1000w kit will quickly kill a cheap 10 ah battery. To be precise, this is about max current, not capacity, am I right? The advertised spec on that ebay battery we...
by donn
Apr 09 2019 3:03pm
Forum: E-Bike General Discussion
Topic: Looking for 250W option
Replies: 49
Views: 941

Re: Looking for 250W option

Alex W wrote:
Apr 09 2019 2:47pm
Not according to the Grin Motor Simulator: https://www.ebikes.ca/tools/simulator.h ... 0&grade=10
That's at 100 kg. We're talking about 160 kg.
by donn
Apr 09 2019 2:14pm
Forum: E-Bike General Discussion
Topic: Looking for 250W option
Replies: 49
Views: 941

Re: Looking for 250W option

eZee will do it too. Like the BBS it is sold as 250W, though it is a much stronger motor. It'll be burning 36wh/km climbing a 10% grade at 20kph, so you'll want to carry a huge battery. WTH? Ezee 250rpm might make it to 15kph if you push it to 200W leg power, and you can get there before it overhea...
by donn
Apr 09 2019 10:32am
Forum: E-Bike General Discussion
Topic: Looking for 250W option
Replies: 49
Views: 941

Re: Looking for 250W option

No 250W-spec motor is going to get you 15-20kph on 10% grade hills with this load, unless you supply 350-400W yourself (this is approaching racing cyclist in a time trial territory, not sustainable for an average fit cyclist). I refer you to 3 posts back, where a BBS01 36V/20A setup is EU "250W", t...
by donn
Apr 08 2019 11:31pm
Forum: E-Bike General Discussion
Topic: Looking for 250W option
Replies: 49
Views: 941

Re: Looking for 250W option

That is a power limitation more than a gearing one. You can simulate this by changing the drive wheel size down, using the "G310 standard" and going from 26" to 20" gets the motor into a more efficient zone and gets the speed up from 13.6kmh to 14.6kmh. That is a minor bump. Of course the max speed...
by donn
Apr 08 2019 6:19pm
Forum: E-Bike General Discussion
Topic: Looking for 250W option
Replies: 49
Views: 941

Re: Looking for 250W option

Sure - that's what's going to happen to this guy, at any reasonable level of human input. Put his 160kg into your simulation. Theoretically, if he were to for example hold it down to 1/3 throttle and put in 300W leg power, he could get a sustainable 111W out of it, but I think at that point we're pa...
by donn
Apr 08 2019 3:53pm
Forum: E-Bike General Discussion
Topic: Looking for 250W option
Replies: 49
Views: 941

Re: Looking for 250W option

If you look at the G310 hubs with multiple windings you can see a real difference. Here is a screenshot with 100W of human input:] I think perhaps inadvertently you're comparing two different hubs there - I don't believe the G01 is that closely related to the G310. I was able to find a place where ...
by donn
Apr 08 2019 12:28pm
Forum: E-Bike General Discussion
Topic: Looking for 250W option
Replies: 49
Views: 941

Re: Looking for 250W option

Whatever the human input. I wasn't looking for a successful outcome in his scenario, because that's out of the question. I was comparing hub A vs. hub B, at more nearly successful loads. I didn't find a hub that offers more than one winding, where the difference between windings would account for a ...
by donn
Apr 08 2019 10:53am
Forum: E-Bike General Discussion
Topic: Looking for 250W option
Replies: 49
Views: 941

Re: Looking for 250W option

Assuming the bike has a 26" to 28" drive wheel I would pick the lowest speed MG31x hub (remember, this is about the max legal for him). I don't think this is the version sold by Grin, most of their hubs have custom windings for a bit more speed. That'll make a big difference when climbing. Will it?...
by donn
Apr 08 2019 9:46am
Forum: E-Bike General Discussion
Topic: Looking for 250W option
Replies: 49
Views: 941

Re: Looking for 250W option

So why would you want the 16 t mac anyway.. Simply because you want a slower vehicle. ... But it WONT have more torque, or carry more weight up the hill because of the slow wind. Only a smaller wheel will increase the torque, with the same watts going in. OK, thanks for taking a whack at that, this...
by donn
Apr 07 2019 8:59am
Forum: E-Bike General Discussion
Topic: Looking for 250W option
Replies: 49
Views: 941

Re: Looking for 250W option

The motor ratings are based on applying a medium load to the motor, and seeing how fast it gets all hot. So a Mac, or the typical direct drive bike hub motors, they are rated 500w. Ooops, yer illegal already. AND, your load is way way beyond medium. So your watts in a hub motor will only melt the m...
by donn
Apr 06 2019 8:44pm
Forum: E-Bike General Discussion
Topic: Looking for 250W option
Replies: 49
Views: 941

Re: Looking for 250W option

Yeah, and I should add - I don't remember what the wattage was, for that MAC 8T 14 inch wheel simulation, but it was certainly way over 250W. (Actually there would have been several numbers to choose from, including power delivered (?) by the motor, and power consumed from the battery, which are of ...
by donn
Apr 06 2019 3:39pm
Forum: E-Bike General Discussion
Topic: Looking for 250W option
Replies: 49
Views: 941

Re: Looking for 250W option

MACmotors build a 16T MAC on order. We even have a seller in Germany who has it in stock. Is this worth a try at 36V and 18A? I think so. I consulted the Motor Simulator - https://www.ebikes.ca/tools/simulator.html . It has no 16T, so I chose 8T and a 14 inch wheel. Looks OK. 260Kg total load and 1...
by donn
Apr 06 2019 8:53am
Forum: E-Bike General Discussion
Topic: Looking for 250W option
Replies: 49
Views: 941

Re: Looking for 250W option

Not that that this is any help, but ... this seems to come up so often, I have to wonder if it's really due to some natural law, or if it's the usual consumer market herd behavior - market can't demonstrate demand for a low speed hub, because no one will offer a low speed hub in the absence of a dem...
by donn
Apr 02 2019 10:26am
Forum: E-Bike General Discussion
Topic: Is cogging normal?
Replies: 6
Views: 246

Re: Is cogging normal?

Speaking to the matter of real cogging - which as I understand it is an inaudible effect that's kind of like slight braking - it would be interesting to have some way to measure it. It's normal, but how normal? Lots of talk about the fact that direct drive hubs do it, but I don't see much about how ...
by donn
Apr 01 2019 8:52pm
Forum: E-Bike General Discussion
Topic: Newbie project for commuting ebike - Help plz!
Replies: 85
Views: 2489

Re: Newbie project for commuting ebike - Help plz!

I guess if you had to live without two components, those would be the two.
by donn
Apr 01 2019 10:03am
Forum: E-Bike General Discussion
Topic: Newbie project for commuting ebike - Help plz!
Replies: 85
Views: 2489

Re: Newbie project for commuting ebike - Help plz!

Nice! How much of the installation did you do yourself?
by donn
Mar 31 2019 1:21pm
Forum: E-Bike General Discussion
Topic: Question about battery for Ebike
Replies: 25
Views: 603

Re: Question about battery for Ebike

Vikingimike01 wrote:
Mar 31 2019 1:09pm
I will most likely pedal to get up to speed.
This I have to see, to believe. The setup couldn't weigh less than 50 kg, likely a good deal more.
by donn
Mar 28 2019 11:07am
Forum: E-Bike General Discussion
Topic: BionX
Replies: 58
Views: 1266

Re: BionX

They cheat themselves thinking that cheap and reliable exist Lots of people do, but there's a range of consumers. There's a market for well made, durable products, at least a small one but larger when there's a well documented difference in reliability. But it would be my guess that when you go tha...
by donn
Mar 27 2019 2:11pm
Forum: E-Bike General Discussion
Topic: Ebikes practicality for cross country expeditions
Replies: 39
Views: 3153

Re: Ebikes practicality for cross country expeditions

Hm, I'm no electricity wizard, but I'm guessing a 5V panel isn't going to give you a real full charge on your average 48V bicycle battery. I see there are some videos out there from "EVMadrid" for low wattage home made 60V, 90V panels; a 60V panel seems OK to me (no electrical wizard) for my battery...
by donn
Mar 26 2019 11:28pm
Forum: E-Bike General Discussion
Topic: Ebikes practicality for cross country expeditions
Replies: 39
Views: 3153

Re: Ebikes practicality for cross country expeditions

In terms of weight, if your trailer would carry 100w solar panels, About 2' x 4' size, 4 of them would do for a charge mid day, during a long noon break. You'd fold them out to charge, not run with all 4 deployed. So in terms of weight, how much for a 2x4 panels? I wonder if there's a minimal confi...
by donn
Mar 26 2019 10:03pm
Forum: E-Bike General Discussion
Topic: BionX
Replies: 58
Views: 1266

Re: BionX

What I got from it was that a reliable long term business model didn't seem to be there for these Bionx conversions. Can't imagine why not.
by donn
Mar 26 2019 12:20am
Forum: E-Bike General Discussion
Topic: BionX
Replies: 58
Views: 1266

Re: BionX

If you could get the motor+controller set up to run with an (or any) ordinary 3rd party 36V Lithium-cobalt or whatever bicycle battery, then the proprietary issue wouldn't matter to most users, am I right?