Recent content by BigBird

VERY INTERMITTANT POWER AFTER HIGH SPEED RUN? I ran my 72V Sur-Ron up to ~48MPH for a minute or so on a road and after I slowed down it sort of shut off. It was a cool day but I assumed it was a heat related problem. I waited a few minutes and tried it again and it would run but was VERY...

The CHI Battery is a Very interesting product! I have 3 questions (which I just posted on their Facebook page. 1 - How is it that you are able to get so many Watt Hours into a pack that is only a little bigger than the stock SurRon and much smaller than competitors (like Lite Speed) need for...

I have a litespeed 20s10p 72v40ah Using Molicel P42A 21700 Cells that is at least as tall as the one pictured below. So my question is how did you get 42 KWH into the same size or smaller package???

Stasus - The battery in your picture below doesn't seem large enough for 4.2KWH of batteries? Can you tell us what type and quantity of cells you are using?

The peg lowering kits also solve this problem.

Thanks for all the great info on my LIPO question. I'm new at this and am OLD Dummy so hopefully you (or someone) can help me some more. I THINK? it looks like I could get 3 of these https://hobbyking.com/en_us/turnigy-high-capacity-16000mah-6s-12c-multi-rotor-lipo-pack-w-xt90.html and a...

Is there a way to use one (or more) of the small light weight battery packages normally used for model airplanes as a BOOSTER for the SurRon stock battery? It would seem it would be easy to carry one or more of these to use as a range extender? These batteries are available in a variety of...

I purchased a Bionx D500 system in Feb 2015 - shortly after they first became available. It has a 48V 11.6Ah battery. In the last year or so most of the eBike companies have come out with ~20% higher capacity batteries in the same size and weight package - due to going to the newer technology...

https://www.electricrider.com/bionx-lithium-battery-upgrade-replacement-p/bionxrebuild-13.2.htm Does anyone have any info/feedback on this?

I THINK I've seen some newly released motors that are designed where they can mount above/behind the down tube - BUT now I can't find them. Can anyone provide a pointer or link to help me out? This would seem to be a good solution for a tandem that has the eccentric bottom bracket and...

One hub motor that works well in steep hills with a tandem is the Bionx d500. It is NOT a front hub motor and is not cheap but is a good system. I have one on a Santana RIO 26" wheel road tandem and one on a Ventana ECDM full suspension MTB Tandem. Our typical rides are close to 100' of...

I was considering this a while back and also wanted true torque sensing. I came up with the following complicated solution but never implemented it. (Got a Bionx D500 system instead). E-Tandem with Bafang BB02 Mid Drive, THUN Torque Sensing BB & Triple Crank+ I THINK I have come up with a...

The Barfang COULD work but has MANY issues. The aluminum BB with eccentric makes fitting the motor problematic and you loose the timing chain adjuster. It is also questionable if the rear cogs/cassette can handle the torque of BOTH human and motor power in the lower gears. We have folded...

I've learned that the motor controller limit is 30Amps SO theoretically it is possible to get 1440 Watts at 48V. Also the MUCH larger motor diameter dramatically increases the lever arm for the power application thus effectively like gearing it down. Looks very promising AND it has torque...

I have recently found data on the latest and most powerful Bionx D500 DV system. I had dismissed Bionx based on the relatively weak power of the earlier systems BUT it appears this one is a BIG step up on the torque output and is relatively light. I LOVE that it has built in torque sensing...