I don't really need to formulate much of a reply since you've revealed your own lack of knowledge there.
Tell me though, How would you compare a 36v 16Ah battery with a 48V 12Ah battery?
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Tell me though, How would you compare a 36v 16Ah battery with a 48V 12Ah battery?
I would say, " as I have a 36 volt ebike I know which will fit my ebike, gosh I am glad some one who has no practical knowledge did not rate them in watts as it would be very confusing for me", or something like that.
The only way to compare them is to use Watt hours.
I'm not here to argue. I'm here to learn and share knowledge as I'm sure are most people. You can take or leave the information I have offered, but either way it is factual.
So a 36 volt motor runs just the same on 48 volts?
The industry standard way to rate a battery is voltage and its capacity.
For the very reason that batteries come in different voltages but often the same package.
The industry standard way to rate a battery is voltage and its capacity.
For the very reason that batteries come in different voltages but often the same package.
D
Deleted member 4366
Guest
Who's we?
I agree with you about being pedantic, so I wouldn't pull anybody up about it; however, having helped exhibitors at bike shows and listened to all the questions that people ask, these units cause a lot of confusion when the wrong ones are used. You often hear dealers talking about 10 amp and 15 amp batteries as well, so people wrongly get the impression that one battery is more powerful than another. When people start talking about a 500w battery on a bike, it must worry a lot of potential customers, who have 250w as the limit in their heads.
A small anecdote. One of our forum members/brand owners nearly got in a fight at a bike show when he asked an exhibitor (well known ebike shop) how many amps they ran a motor on a particular bike at. The reply he got was something like, "it's a 10 amp battery". We explained that it was the controller that determined the current. The exhibitor then said that the current was 7 amps because it's a 250w system and 250w divided by 36v equals 7A.. Our forum member corrected him again about that, to which the exhibitor replied that he was an electrical engineer and he knew what he was talking about. The attempts to educate him after that resulted in him getting madder and madder until we were ordered off his stand. We left, but that wasn't the end of it.
From my own experience in visiting many shows, most dealers and exhibitors haven't got a clue. Some like to be informed. Many don't.
I try to gain some knowledge from these electrical discussions. To be fair, it doesn't take much to lose me on them. 
Yes, it is entirely possible for a controller to supply a motor with the same power while opperating on 48V as 36V, after all, it is just a buck converter that regulates power.
That however is missing the point.
The only industry standard that exists to compare the amount of energy that ANY pack can hold is that of Watt hours.
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Sorry d8veh for derailing the thread even further than it already is.
Electric Bicycles by David Henshaw and Richard Pearce. https://www.amazon.co.uk/Electric-Bicycles-David-Henshaw/dp/1901464245
ISBN 978-1-901464024-5
I'm sure that others could recommend many other books beside, but I certainly don't regret buying a copy, and a very nice touch to it, was when I first opened it and saw that it had been signed. Little things can be very pleasing.
LP if nothing else, this forum introduced me to a superbly informative book.I try to gain some knowledge from these electrical discussions. To be fair, it doesn't take much to lose me on them.
Electric Bicycles by David Henshaw and Richard Pearce. https://www.amazon.co.uk/Electric-Bicycles-David-Henshaw/dp/1901464245
ISBN 978-1-901464024-5
I'm sure that others could recommend many other books beside, but I certainly don't regret buying a copy, and a very nice touch to it, was when I first opened it and saw that it had been signed. Little things can be very pleasing.
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This is what I have at the moment, the photo is from b+m but I confirm that it is true to real life use*. Each cone is separated by 5 meters (10 cones in picture). This is what 40 lux looks like in the pitch black. It is stronger than street lighting in town. The one I am ordering this week is 70 lux.
*I have mine mounted on the fork for the moment so I have the wheel shadow for the first 5 meters I will be mounting on the handlebars.
D
Deleted member 4366
Guest
Jeez! You can get six of the ones that I showed on post #1 for the same price, and each one is probably 6 times better.
Your photo shows the B&M light spread over about 10 sq M, so 70 lux would be 700 lumens. The Ebay one is 3000 lumens or 300 lux, so maybe 4 times better.
Looking at Eddie's photo the beam is round so it lights up the trees. I don't want to blind drivers and almost all of my night riding is on a busy main road. I don't mind paying 60€ for a light with the correct beam shape. And it is road legal with all the correct markings. My bike has already been checked out by the Basque police but not in depth. I don't need any problems with them they are very quick to draw the ticket book...
D
Deleted member 4366
Guest
Probably not for two reasons: Firstly the light will take more power than the USB socket can give, which will probably blow something. Secondly, USB is only 5v, which is 1v below the minimum for the battery pack. The light would be a lot dimmer if it would work at that voltage, but it wouldn't surprise me if there's a low voltage cut-off in the light set at 6v.
You can run it from the main battery if you uses a DC/DC converter and switch.
http://www.ebay.co.uk/itm/LM2596HV-DC-DC-Buck-Converter-5V-60V-to-1-25V-26V-Power-Module-48V-to-3V-5V-12V-/321512279591?hash=item4adba00e27:g:fr4AAOSwQItUCR6F
Funny that you should mention this as I was only yesterday looking at the lens on the Fenix to see if I could replicate the lens diffuser across to the new light.Looking at Eddie's photo the beam is round so it lights up the trees. I don't want to blind drivers and almost all of my night riding is on a busy main road. I don't mind paying 60€ for a light with the correct beam shape. And it is road legal with all the correct markings. My bike has already been checked out by the Basque police but not in depth. I don't need any problems with them they are very quick to draw the ticket book...
It might just be a case of using something as simple as a section of the stick on headlamp convertor for a car headlight lens.
Fenix method.
Thanks d8veh for the original review I'm ordering one too.
Regarding the fenix lens it's interesting they have horizontal diffusings in the top part of the lens compared with the whole diffuser I use has vertical ones.
http://www.ebay.co.uk/itm/282152351559
Regarding the fenix lens it's interesting they have horizontal diffusings in the top part of the lens compared with the whole diffuser I use has vertical ones.
http://www.ebay.co.uk/itm/282152351559
Fenix method.
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