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All my switch does is disconnect the battery from the controller. LifePo4 ebike full build | Pedelecs - Electric Bike Community There's my build if you were interested. this is sounding more and more like I should series in another 4 cells and see how 48v runs compared to the 36v at slower speeds

It is a G020 hub winding code 10 so its a little quicker but it is 36 v so 48v might put the rpm up quite a bit more than a 48v code 12. I'm glad to here overheating is not a problem but would a motor with a lower winding speed have an easier time getting up a hill as apposed to a higher rpm...

I keep a close eye on my voltage already, I was going to wire it so it would effectively just series all the cells together from 12 to 16 Its a good point, I would end up with 12 cells at lower voltage than the extra 4 I'm adding if I only use the extra 4 part time but I though cells would only...

I do have a switch with a soft start on my main battery at the moment. It has survived a good few hundred uses even after I stopped using the soft start, although I've never switched it on/off under load. the idea is to use something like a 60v 20a relay so I can switch under load. The point...

I've been running a bafang hub motor on 36v for a while now and it gives me reasonable low speed performance and tops out around 20mph which is ok but I would like a higher top speed. If I upgrade my battery to 48v this will give me a higher top speed but I think I'm right in saying this will...

My main concern is with the cells themselves. I made a load of dummy cells out of pvc pipe (my cells are 33mm diameter x 140mm), put a wire through the middle, terminals on each end and filled them with sand to get the right weight. I fixed the pack together as if i had the real cells in place...

I have wondered how people managed to get away with batteries mounted only on the bottle cage mounts. It seems like a lot to put on 2 bolts to me. I see no designs of ebikes (particuly factory ebikes) make much if any effort to protect the battery from shock. Maybe i just think they are more...

I wanted to hear your views on how necessary you think it is to isolate a battery from the general road vibrations and shock you get from riding. Ie hitting a pothole hole or just a generally uneven surface. Obviously full suspension bikes and fat bikes would have most of this isolated but what...

I did consider it but the mechanical stregnth is no-where near as good as leaded or unleaded solder. My design at the time needed a decent mechanical bond between the cells. I know you shouldn't rely on solder for that but its plenty capable on joints of this size. I did try to assemble the...

I suppose it could be but i not had an issue. I did test it by switching it while underload and it seems to have survived

Its about £15 for a sheet from aliexpress for 100mmx100mmx0.1mm. I have access to an xray machine at work so i tested it for purity, the xray showed 99% + purity

Building an E-bike is something I've wanted to do for a very long time and last year I finally got round to it, hopefully there is some value in here to anybody looking to do the same thing. In this write up I will cover pretty much my whole build and share my experience and hopefully inspires...

Im using a kt controller and a kt lcd 3, i believe it calculates speed from inputing the number of poles ( of the motor) x the gear reduction and the wheel size. Its basically all built in.

I did wonder at what point spokes became too big for rim drillings. 12/13 seems pretty massive for a bicycle (imo). Pro's can put far more through a wheel than the 400watts im putting though mine with fewer and thinner spokes. The sapim strongs are 13 gauge at the j bend and 14 thoughout the...

I halved the flange to flange, added 5.6 to the left to give 26.85, took 5.6 off the right side to get 15.65. Which did seem like quite a big difference to me. It looks like i have my left and right mixed up, the calculator im using uses different left and right for the front and back wheels. I...

Thank you very much, looks like im on the money with the length (I did round to the nearest 1mm). Rim width is 24mm overall and 19mm internal I think i'll go for the best fit for the spoke holes in the hub regarding the gauge.

I need to fit a 26" rim to a rear bafang hub motor (RM G020.250.DC 10) it takes a cassette if it makes a difference. Ive rebuilt quite a few wheels before just measuring off old spokes but never had to calculate my own. Is there anything different to building a hub motor wheel? Would a 1...

That seems like the only way forward from here is to investigate further. Its a tad annoying because of how 'buried' in to the pack it is. I did design this so the top 6 can hinge open from the bottom 6 cells. Im going to keep the cell in untill this weekend when the rest of the parts for my...

This was my thought but i can get probes to touch directly on the ends of the battery bypassing any external connections to it. Surely an intermittent contact would give open loop at times of disconnect rather than the intermittent 0v that i am getting? I am always able to get continuity...

I see the same behaviour with and without the bms. Damage from the heat is possible, i was very careful about soldering these. I was able to fit a heatsink to the termianl while soldering and it was done very quickly, less than a second. I also used compressed air to help keep them cool. I can...