Recent content by harryS

Two choices in controller design determine whether over volting is possible. The first is a an over voltage voltage detection circuit, Most often used in midmotors. NEver seen one in a hub motor controller, The second is component choice. Maximum charge voltages on 48V and 36V batteries are...

2000W motor in rear? That's mechanically safe. In front, not very safe at all as the forks will break off and you face plant. In the rear, the wheel will just spin if it gets loose, tear out the wires. and might jam the and skid, but you probably won't land on your face. Torque arm is...

I still had a swollen leg two weeks after a crash. Saw doc. Got checked for clots. Passed. Got better on my own, Five years ago, an insurance underwriting exam found (not visible) blood in urine. Second test was clear, but I saw a urologist anyway and entered his house of pain. Yow!. Nothing...

Cheap Xmas deco. I had found the bike in trash a while ago, Threw it away afterwards.

The 48V ebike controller is 48V at 50% charge, and will operate between 40V a(controller cutoff) and 54.6V (full charge) for li-ion, A 48V LFP is 51.2V nominal and charges up to 58V. Most hubmotor controllers will work that high as they don't usually have high voltage cutoffs. The RAD...

RIght now, you can get LFP cells and have the fire safety. Not too expensive, but a big weight penalty, I'm not sure solid state is available as bare cells. I can buy sodium cells, but the 18650 size are pretty low capacity, about 37% of a good Li-on. New 21700's are 60% of Li-ion, but are...

Welcome. I'm old enough to have built crystal radios and study vacuum tubes in my youth, Still young enough to build/ride DIY ebikes in my retirement.

Welcome to the forum. Which one did you do? The Vevor hub motor, or the bare motor you clamp to the side of the frame?

Here in Illinois, there is a circuitous path to register a vehicle without a vehicle identification number, VIN. Involves purchase documentation, and an inspection at the DMV by a cop. The latter is to prove it never had a VIN, but then you get into safety. Probably get rejected if the tires...

When the BMS is stopping the battery from charging, it often isolates the cells from the discharge port. leaving no access to recharge thru the output, The safer approach is to open the battery and measure the internal cell voltages. Even then, I think this is why NYC had so many ebike fires...

Ha ha ha. As an old time phone company employee and stock holder, I remember those tales of telephony crime and karma.

You own the bike. Just post a picture of it. If this is representative, you probably have to cut the bracket off. It might need rewelding to maintain frame integrity. Might not, if cut carefully. Why a new motor? If the Kalkhoff is never used , get rid of the existing 15 year old battery...

I trust Google AI to make better use of a bike speed calculator than me, as it has better understanding of the drag coefficients from sitting upright, and also more knowledge of tires. And Google says it would take 1123 watts to push that Ancheer to 28 mph. A regular mountain bike would need...

The grey box behind the battery held the controller on earlier versions. They probably moved the controller to the battery cradle, where it's potted to prevent tampering. If you installed a 25A controller in a grey box behind the battery, with a matching handlebar display, I expect you could...

Limits Class 1 and Class 2 to 16 mph.. Everything manufactured before Jan 1, 2027 is grandfathered. Having two standards by date is unenforceable.. I'd call my state reps if I lived there,