Endless Sphere

- Heat buildup under a moderate 10amp load for an hour is concerning My 10S3P with Samsung 30Q 141 cells isn't abused. Never draw more than a 5amp load at most and then no more than 1 minute at most. IMO, a 10amp load is NOT moderate with 30Q cells making up a 36V 10S3P (9 Ah) battery pack. Samsung...

Thanks Sundar. The specs of the NCR (or Samsung) cells are pretty well known – but these don’t visibly look like the NCR cells advertised. They do have the amp hours advertised. 1hr 15min at roughly 10 amps is about right (it wasn’t full throttle the whole time). My concerns are: - Build quality is ...

True.

Although I have been using my snowjoe battery pack as a range extender. They are 10s2p and give me about 30 minutes at full throttle. (Samsung 30q batteries). That was only $120 shipped.

What else am I going to do with the batteries for my snowblower in the summer time?

I took a chance and bought these - laudation 36V 10ah Li-ion Battery 18650 (10s3p) for $135 shipped https://www.ebay.com/itm/laudation-36V-10ah-Li-ion-Battery-18650-Rechargeable-battery-for-E-Bike-Electric/254277288980?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649 (they have changed...

Ok, I'm curious. Its good to see him branching out like this. Still, you are looking at CAD models, so no telling what the final bike will really be like, If you remember 5 years ago, a LOT changed from the initial pictures (mostly for the better). There are old posts here where I documented that hi...

Dang, that is impressive. Looks like part of your ride is pretty with nice patches of nature. I though I commuted a lot, but I probably only do 3000 miles a year. I blame winter! Nice photos – the woman in that last photo looks like someone I used to date in Germany. :-) That is an impressive build,...

Sort answer: range. The basic advantage is they can be transported without normal lithium hassles. But the can also be strung togetheer in various combinations. I think it is a little silly to buy the biggest battery you would ever need and carry it with you every where you go. LiGo allows you to ha...

@rolandhorth That is great Roland, sounds like you have created exactly what you need. I think a CX (or gravel) bike is the perfect platform for a fast light drop bar commuter for someone who wants to add their own pedal power. Your setup is great for someone who can do 18-20mph on their own. Its ki...

I love the mighty mini. Long before they came out with that, I asked them if they would make me one in 36v format. At the time they were not interested in 36v packs, so I had em3ev make me one (same size and watt hours, but much more Ah). I'm glad they took the idea and ran with it (at least in a 52...

I have a seatpost battery for one of my builds. with my 3lb battery it works. I wouldn't want too much weight that high. How do you attach the power feed to the backpack? I saw one design once that used magnetic coupling effectively acting as a quick disconnect to the power supply. I did do the back...

Thanks for the replies. That is good info. Looks like the ZZ faring is $200. That is a lot for an experiment that may not work (although this time of year, wind chill is a factor in the northern latitudes!).

Maybe I'm missing something. Fixed gear means that you can not coast. The hub turns, the pedal turns. Pedal backwards, the hub turns backwards. Single speed means you only have one gear, but you can coast - that is what a freewheel does. There are no motors that use a fixed gear locking ring (i.e. l...

yeah, don't skimp on batteries. Get a name brand like Panasonic or Samsung. I tend to get my stuff from Em3ev or ebike.ca.

have you ever broken one?

I have had seat post attachment racks brake, but not the 4 point attachment racks. You can't accurately say steel is stronger than aluminum. It will bend more before it breaks than aluminum. If you are concerned about cracking/breaking - go for steel.

are you talkling make or buy? Really, it all depends on the frame builder as you can get a lot of overlap depending on what the frame builder wants. From a buy perspective: Steel is maybe 2lbs heavier (or more for a heavy duty frame). tends to ride better, doesn't fail catastrophically, and can be r...

A thread on efficiency got me thinking about fairings. I ran across this: "Numbers on the topic aren’t easy to find, but some that are regularly cited are extracted from David Gordon Wilson’s Bicycling Science. He states that a rider on a touring bike equipped with a partial fairing, and his or...

And your ass weighs? Assuming your ass weighs 200 pounds or less, you are going at least 35 mph, running 1400w continuous. Nothing on earth will make your 35 mph more efficient, except aero. Your motor is running flat out, your controller is not pwm ing. To get better efficiency, buy a recumbent bi...

Here is my light weight speedster. The frame bag holds the battery, but it is mostly empty (or available for other cargo). I've cleaned up the wiring a little since this shot.

Nice – that is the bike I built in 2013. It is so much fun riding a fast light ebike (and super rare). I have a mountain bike version too, but I don’t use that much. Light and fast is my passion! Where did you buy the motor from? What rpm version is it? FYI, I went to the hardware store and found so...

What are you trying to do?

There are no motors that accept lock rings.

Why in the world would you NOT want to COAST with a motor?

Not many motors can accommodate a single cog.

I average 34mph in my car 20 in my ebike, and 16 when pedaling

That sounds about right, weight wise. The weight of the motor (on my rear wheel) never bothered me as far as handling went. I think you'll be OK at those speeds on a bike like yours. If you want the bike to be more agile its not the best place. But at 15mph on a dutch style bike it should be OK. Tha...

docw009 wrote: The Q100 is indeed 4.8 pounds. I've weighed mine. I bought a custom 10S-3P battery and it supports 30 miles of riding. Probably around 3 pounds and fits in a seat bag.

Me too, as soon as I could get a 350watt-hours in a 10s3p (about 2 years ago, finally!). My battery is lighter than my motor!

Another benefit of a gravel bike. They tend to have large triangles specifically to fit frame bags like that (for bikepacking). A bike from the '90s (before compact frame geometry) has lots of triangle room. Yeah, I have the classic 1993 specialized Allez racing bike (the one in the movie of that ye...

wow, quite the slash. Impressive that the sealant plugged it.

Certainly you don't want dirt getting inside the tire or near the tube where abrasion could be a problem. that and you don't want that crack to grow.