anth_85
10 mW
I am planning my first e-bike that will be used 99% for commuting. The route I'll take too and from work is about 15miles each way partially on the road getting into and out of town and partially cycle route that is 50:50 tarmac / (smothish) gravel. I am used to cycling on a road bike to work but there are parts I just don't feel comfortable on it, either the roads are too fast, I'm too fast for the path or the bike cant handle gravel. So I am thinking of using a cyclocross bike as a base as I like drop handles rather than flats and it means I can avoid the faster roads. Which one I haven't decided. It will be through the cycle to work scheme so I was looking at something around £600-700. I'm sure I saw one a month or two ago that was 1x11 but I cant find it now.
For a motor I am pretty set on a BBSHD, probably with the screen removed and I'll just put my garmin on it instead. I don't want the pedal assist either, I'd rather just use a throttle and control it myself.
For a battery I am about 50 cells into testing a 14S10P build, aiming to have them all around 2400-2500mAh to give a 52v,24Amp pack. Which should give me range to get to and from work without charging at work. I have been looking at the blackburn outpost large frame bag http://www.wiggle.co.uk/blackburn-o...|pcrid|67090793342|pkw||pmt||prd|5360740373uk
which I am 99% sure will be big and strong enough to hold the weight of the battery, and keep the weight in the middle rather than over the back wheel.
There are a few things I am still to decide on,
1) which bike? I know not all have threaded bottom brackets so that narrows it down. I'd also really prefer the right shifter cable routed through the bar tape for a cleaner look. My old Sora one used to drive me nuts aesthetically. So in that price point it is probably a tiagra groupset with mechanical disk brakes like Spyre TRP.
2) spot weld vs solder? I have soldered 18650s in the past, making a 150Ah 12v battery suitcase with built in inverter to use in my caravan off hookup. The advantage to that was I could use fuse wire on each cell, the negative to that was the cells getting hot and difficulty getting solder to stick to some of them. I also don't need to buy a spot welder, but a spot welder gives a much cleaner finish.
3)BMS? There seems to be a few different ones for 52V/14S packs, all from china and mostly with poor reviews depending on where your looking. I'd rather not spend a fortune to be honest, and would be tempted to go without one if I could figure out a way to balance charge a 14S pack, my iMax b6mini doesn't get close to 14S.
4) charger? Obviously linked to the previous issue, if I do get a BMS do people usually use a scooter charger or something similar? I'm not bothered about quick charging, I'd rather it charged slower as it will be charged overnight for about 12 hours so a slower charge would be better for the cells.
5) legality? I am in the UK. I know the limits are rubbish and the laws massively out dated, but the law is the law. I'd like to be able to flick a switch when going onto the road to be road legal, then flick it to be full power when off road, is this possible on the BBSHD, or is it a matter of being sensible and regulating it yourself.
6) throttle I've seen a few on drop handle bars online and it does look possible, I'm not sure how accessible it would be from on the hoods to on the drops though, which got me thinking to whether something would be rigged up to the left shifter which wouldn't be used for gear changes, it would negate the need to have the brake sensor as you'd struggle to brake and use the shifter at the same time. Has anyone seen anything like that?
For a motor I am pretty set on a BBSHD, probably with the screen removed and I'll just put my garmin on it instead. I don't want the pedal assist either, I'd rather just use a throttle and control it myself.
For a battery I am about 50 cells into testing a 14S10P build, aiming to have them all around 2400-2500mAh to give a 52v,24Amp pack. Which should give me range to get to and from work without charging at work. I have been looking at the blackburn outpost large frame bag http://www.wiggle.co.uk/blackburn-o...|pcrid|67090793342|pkw||pmt||prd|5360740373uk
which I am 99% sure will be big and strong enough to hold the weight of the battery, and keep the weight in the middle rather than over the back wheel.
There are a few things I am still to decide on,
1) which bike? I know not all have threaded bottom brackets so that narrows it down. I'd also really prefer the right shifter cable routed through the bar tape for a cleaner look. My old Sora one used to drive me nuts aesthetically. So in that price point it is probably a tiagra groupset with mechanical disk brakes like Spyre TRP.
2) spot weld vs solder? I have soldered 18650s in the past, making a 150Ah 12v battery suitcase with built in inverter to use in my caravan off hookup. The advantage to that was I could use fuse wire on each cell, the negative to that was the cells getting hot and difficulty getting solder to stick to some of them. I also don't need to buy a spot welder, but a spot welder gives a much cleaner finish.
3)BMS? There seems to be a few different ones for 52V/14S packs, all from china and mostly with poor reviews depending on where your looking. I'd rather not spend a fortune to be honest, and would be tempted to go without one if I could figure out a way to balance charge a 14S pack, my iMax b6mini doesn't get close to 14S.
4) charger? Obviously linked to the previous issue, if I do get a BMS do people usually use a scooter charger or something similar? I'm not bothered about quick charging, I'd rather it charged slower as it will be charged overnight for about 12 hours so a slower charge would be better for the cells.
5) legality? I am in the UK. I know the limits are rubbish and the laws massively out dated, but the law is the law. I'd like to be able to flick a switch when going onto the road to be road legal, then flick it to be full power when off road, is this possible on the BBSHD, or is it a matter of being sensible and regulating it yourself.
6) throttle I've seen a few on drop handle bars online and it does look possible, I'm not sure how accessible it would be from on the hoods to on the drops though, which got me thinking to whether something would be rigged up to the left shifter which wouldn't be used for gear changes, it would negate the need to have the brake sensor as you'd struggle to brake and use the shifter at the same time. Has anyone seen anything like that?