Can you get 100 A from a 48 V battery? As well as the 250 W and 25 km/h remember there is a 48 V cap on maximum legal voltage.

Discharge rate is theoretically unlimited as you can just add more capacity to increase the maximum of a battery pack.

 

Also, even the cheap Hobbyking 5Ah 20C LiPo packs are rated for 100A, although would likely sag lots.

I was just trying to imagine a standard sized battery giving 100 A. I know that with enough Lipo you can go that high <evil laugh>...

Totally feasible for 'regular' packs. Samsung 25R 18650 cells are good for 10C, so a 10Ah pack of these would be good for 100A discharge.

pumping 100A into a BBS01?

I try to keep the OP away from the dark side.

15A @ 40V is enough for 99.9% of cases unless he's stuck in mud.

Totally feasible for 'regular' packs. Samsung 25R 18650 cells are good for 10C, so a 10Ah pack of these would be good for 100A discharge.

The Vulcan Aircraft had internal 112v lead acid batteries (4 x 28v in series). Normally to start their engines you would use an external diesel generator plugged in under the wing. However when dispersed to unequipped sites for Quick Reaction Alerts they could use their batteries to start 1 engine which would then be used to start the other 3 engines. The load to start that one engine from the battery was 700 amps and the batteries sagged from 112v to 100v. Once one engine was running I think they could start the remaining 3 engines simultaneously from its generator. The internal busbar installation was epic engineering

Can you get 100 A from a 48 V battery? As well as the 250 W and 25 km/h remember there is a 48 V cap on maximum legal voltage.

 

That's the advantage of lipos. A pair of these are smaller than your average ebike battery, but can give 400 amps at 48v.

 

http://www.hobbyking.com/hobbyking/store/__18210__Turnigy_nano_tech_8000mAh_6S_25_50C_Lipo_Pack.html

200 Amps at 37 V isn't too shabby either and 320 € for a 16 Ah 37 V (4 x 5C connected 2P 2S) battery is about half the price of a 16 Ah Li-Ion battery. I looked at nanotech but they were out of my budget range at the time, I like the form factor they fit in small places.

So do I but its a privilege not a right on an ebike.

 

Just don't get the reasoning behind illegalising pedelecs. They are brilliant as they are. If you want high power,faster speeds just get a motorbike.

 

Would be easy to police no ebikes in country parks, impossible to differentiate legal from otherwise.

 

We are making it easy to justify.

 

I absolutely agree with your comment, riding a powered vehicle without the need to register, tax, insure etc is a privalige and not a right. We need to be very careful that we don't give any reason for the government to reconsider.

 

However... 350W nominal bikes with a 28mph limit are not motorbikes. Even standard mopeds are many times more powerful. They are a little bit more powerful than a standard pedelec and don't have the pesky cut off at 16mph. They are more useful and certainly more fun. There should be discussion about where they are used, the use of helmets etc, but in my oppinion we should be working towards a specific class for these bikes as in Germany, Holand etc.

 

There is absolutely no doubt they will be sold and used in the UK in very big numbers. This may possibly jeopardise the special position in law of the standard pedelec, so let's all push for legalisation.

 

All the best, David

Edited April 30, 20169 yr by Wisper Bikes

I absolutely agree with your comment, riding a powered vehicle without the need to register, tax, insure etc is a privalige and not a right. We need to be very careful that we don't give any reason for the government to reconsider.

 

However... 350W nominal bikes with a 28mph limit are not motorbikes. Even standard mopeds are many times more powerful. They are a little bit more powerful than a standard pedelec and don't gave the pesky cut off at 16mph. They are more useful and certainly more fun. There should be discussion about where they are used, the use of helmets etc, but in my oppinion we should be working towards a specific class for these bikes as in Germany, Holand etc.

 

There is absolutely no doubt they will be sold and used in the UK in very big numbers. This may possibly jeopardise the special position in law of the standard pedelec, so let's all push for legalisation.

 

All the best, David

Good post and points well made.

Totally agree.

Your stand point is a responsible one, hopefully giving reassurance to policy makers industry can police itself. ???

Many of the "350w" 28 mph electric bicycles are physically identical in all respects to the "250w" versions apart from the plate on the frame. If you know how, you can set your bike to be either version. We know that's the case with Bosch motors. As Yamaha, BrosePanasonic and Kakhoff have similar power to the Bosch up to 25 km/h, we can assume that it's the same with them. There's are motors too that have identical 350w and 250w versions. Just about every savvy manufacturer is doing it, so it's no big deal.

Sorry to hi-jack my thread here...............

 

I noticed some kits advertise brushless motors, I guess the obvious is either the motor has brushes in it or it hasn't.???

Which is best, pro's & con's. ???

Thanks again.

Sorry to hi-jack my thread here...............

 

I noticed some kits advertise brushless motors, I guess the obvious is either the motor has brushes in it or it hasn't.???

Which is best, pro's & con's. ???

Thanks again.

Most (perhaps all) hub kits these days use a brushless DC motor (BLDC).

 

Sent from my HTC One_M8 using Tapatalk

there are still some cheap kits around with brushed motors, but all modern kits use brushless motors which are generally more reliable, quieter and maintenance free.

O.K. guys thanks for that........................