Recent content by emissions-free

You can set current limit and you can also set a max speed using the plug in CA. You need to ensure the controller is suitably equipped and that the controller is suitable for your type of motor. I do not believe you require hall sensors on your motor for the CA to limit the controller in this...

I'm not a consumer and the last time I bought motors it was 10,000USD worth. Tongxin don't answer emails and from what I have seen they are very unreliable motors. They can keep their motors as there are plenty of other companies that do respond and have motors that don't fall apart if you look...

There's a nice looking cylindrical battery pack that is now becoming available that has a mounting to go onto the washer bottle. This is a 36V, 9Ah Li Ion pack. Also seen some 7Ah packs that are a bit smaller that bolt onto the seat tube or could go somewhere else. The kits that Bafang offer...

What's so special about the Dapush or Dapu setup? I've tried it and didn't find it any better or worse than other stuff that is available from Bafang or Ananda. I found it very similar in size and performance to the Ananda 108 motor, smaller than the Bafang front motor but not as quiet. I...

That's absolutely spot on and this is how packs in EVs can have such a long lifecycle. The only problem with actually trying to implement this on your average ebike is that although you can control the DOD it's not so easy to control the charging level. The BMS inside is fixed to certain values...

There's 2 terms commonly used, DOD, Depth of Discharge and SOC, State of Charge. DOD of 100% is completely discharged, no more power remaining. 100% SOC is fully charged and is related to temperature as well as voltage so it's not as simple as saying 100% SOC is 3.65V for LifePO4. The same...

No worries I'm only having a laugh :) Nothing wrong with some extra strong watts and you've always got to consider the tolerances in such things and different rolling radius of tyres etc ect just to ensure that everyone gets their fair share ;)

A 20A controller on a 36V 250W ebike :eek: Is that legal? ;)

Yeah I do believe it is feasible but I don't really have the time right now to take on another small project like engineering a complete solution. I have a big pack that is already overdue and it has been big headaches and untold time sorting out all the little details. Also I'm not so sure...

Yeah of course RC lipo is good stuff but if over charged or over discharged it is liable to burst into flames. They sell fire proof bags for charging :eek: You can only get good lifecycles if you are very careful with not going to deep discharge levels. It is not forgiving and the prices are...

I was only referring to the cells themselves and yes I didn't state LiFePO4 in the but I did in the message. The 20Ah cells are generally 467g and are 3.3V nominal, 20Ah, so 66Whrs per cell. So they have an energy density of 141.3Whrs/kg combined with very high power density of something like...

I do take note and will look at trying to offer some more options. The A123 26650s in a small pack can still give great power if you haven't got far to go. There are also various Li Polymer and LiFePO4 pouch cells that give good performance in a compact package with sufficient current to easily...

Thanks Paul :) Yeah I know these cells are not for everyone but if you were looking to have a slightly illegal bike... then these fit the bill very nicely. I will try to diversify a bit more in the future and start to supply packs with lower C ratings and price tags :)

Unfortunately I doubt these cells would fit into a typical ebike battery enclosure. The enclosures tend to be narrower than these cells. The 15Ah cells are approximately 15cm wide. The main hurdle to changing the cells in your batteries would be that LiPoly is typically smaller and lighter...

Gents, just thought I'd give my fellow countrymen the opportunity to get some really top quality Battery Packs at very competitive prices. I'm keeping the prices in USD as I think this is the fairest way as it is pretty much pegged to the Chinese RMB and I'd rather give everyone a level...