Ohbse
10 kW
Hey all
Been lurking and learning for some time now and have actually built a couple of bikes over the last year or so. Thought it's about time I had a thread where I can concisely record my experiences and hopefully help others looking at the same type of bikes.
My current every day ride is a Giant DH Comp from 2005:
It's made up of (running left to right)
Pelican 1300 mounted to Marzocchi 888 CR fork (ride height adjusted all the way down) with ballast clamps (purchased from eBay)
Battery is 20s 25ah assembled from LG HE4 cells, a total of 1.8kWh. Isolated by a breaker as suggested by Allex, monitored and protected by Adaptto BMS. Cells terminated with full mesh of 0.3mm Nickel strip welded with my custom lead powered MOSFET switched spot welder. Battery output all 8ga Turnigy wire back to Adaptto Mini-E currently, but will shortly be back to Max-E once it is returned from repair in Russia. Phase wiring all 8ga.
Half twist throttle on the right grip, thumb throttle on the left to control variable regen (currently configured for 30a battery or ~2.2kw, I rarely use physical brakes)
Shimano Saint brakes on front, older M375 on rear. 205mm rotors front and rear.
Manitou 6 way Swinger(original equipment on the DH)
150mm standard swing arm
Kiwi-designed dropouts manufactured by Scott from ES (Thanks Scott!)
Cromotor v3 in a 24" Sun rims Kingpin with 12ga Sapim spokes
26" front and 24" rear hookworms with DH tubes
It gets used every day to travel 35km return commute. It has done 4,500km since it was built with near flawless reliability. Top speed reached while testing Max-E of 91km/h, however this is not even close to true maximum. Once Max-E is back I will find a suitable road and re-test, I expect ~105km/h will be possible with this new battery and suitable space.
My daily ride to work, very little traffic this day as it was a bit later than usual:
[youtube]9_zyrhziacU[/youtube]
Riding like this (e.g much faster than traffic) consumes a long term average of 26wh/km for a return journey total of about 900wh and a total range of about 70km on a charge.
I charge at both ends using on-board Adaptto charging function with an 1800w Lineage power CP1800AC52 (I bought two). I tend to run the PSU at its rated 1800 watt and bulk charge the pack to 81v or 4.05v/cell shortly before I am due to depart. This minimises the time spent at 'high' state of charge (I realise 4.05v is very conservative anyway). This should result in a long and happy life for my 18650 pack while allowing for a hefty bump in potential range for when I want to cover some real distance. My pack has a total cell voltage spread of <8mv and has maintained that for several weeks since I built it.
Currently set for the maximum battery/phase current the locked mini-e latest firmware will allow, it delivers 5kw HOC. With the big brother controller in place it will happily deliver 10kw and is acceleration is geometry limited (e.g wheelies everywhere)
With about 8,000km of high speed 'ebike' commuting under my belt over the last 13 months I have had zero issues with police or anybody else on the road (beyond the occasional angry person who's angry in general). In New Zealand the legal limit is 250watt continuous, I am obviously a whole heap higher than that but nobody seems to care so far. I have had positive interactions from countless people who all ask the usual questions, plenty ask where they can buy one.
The bike as it stands owes me something in the region of $5,500 NZD all up. While that scares a lot of people off, it's very possible to achieve similar performance for a whole lot less. In my case I spent more for smarter solutions that were under-stressed and over-specced in the interest of reliability. I don't NEED 10kw or 1.8kwh of capacity - but it sure makes life easier sometimes.
Any questions? Anybody want me to expand on anything?
Been lurking and learning for some time now and have actually built a couple of bikes over the last year or so. Thought it's about time I had a thread where I can concisely record my experiences and hopefully help others looking at the same type of bikes.
My current every day ride is a Giant DH Comp from 2005:
It's made up of (running left to right)
Pelican 1300 mounted to Marzocchi 888 CR fork (ride height adjusted all the way down) with ballast clamps (purchased from eBay)
Battery is 20s 25ah assembled from LG HE4 cells, a total of 1.8kWh. Isolated by a breaker as suggested by Allex, monitored and protected by Adaptto BMS. Cells terminated with full mesh of 0.3mm Nickel strip welded with my custom lead powered MOSFET switched spot welder. Battery output all 8ga Turnigy wire back to Adaptto Mini-E currently, but will shortly be back to Max-E once it is returned from repair in Russia. Phase wiring all 8ga.
Half twist throttle on the right grip, thumb throttle on the left to control variable regen (currently configured for 30a battery or ~2.2kw, I rarely use physical brakes)
Shimano Saint brakes on front, older M375 on rear. 205mm rotors front and rear.
Manitou 6 way Swinger(original equipment on the DH)
150mm standard swing arm
Kiwi-designed dropouts manufactured by Scott from ES (Thanks Scott!)
Cromotor v3 in a 24" Sun rims Kingpin with 12ga Sapim spokes
26" front and 24" rear hookworms with DH tubes
It gets used every day to travel 35km return commute. It has done 4,500km since it was built with near flawless reliability. Top speed reached while testing Max-E of 91km/h, however this is not even close to true maximum. Once Max-E is back I will find a suitable road and re-test, I expect ~105km/h will be possible with this new battery and suitable space.
My daily ride to work, very little traffic this day as it was a bit later than usual:
[youtube]9_zyrhziacU[/youtube]
Riding like this (e.g much faster than traffic) consumes a long term average of 26wh/km for a return journey total of about 900wh and a total range of about 70km on a charge.
I charge at both ends using on-board Adaptto charging function with an 1800w Lineage power CP1800AC52 (I bought two). I tend to run the PSU at its rated 1800 watt and bulk charge the pack to 81v or 4.05v/cell shortly before I am due to depart. This minimises the time spent at 'high' state of charge (I realise 4.05v is very conservative anyway). This should result in a long and happy life for my 18650 pack while allowing for a hefty bump in potential range for when I want to cover some real distance. My pack has a total cell voltage spread of <8mv and has maintained that for several weeks since I built it.
Currently set for the maximum battery/phase current the locked mini-e latest firmware will allow, it delivers 5kw HOC. With the big brother controller in place it will happily deliver 10kw and is acceleration is geometry limited (e.g wheelies everywhere)
With about 8,000km of high speed 'ebike' commuting under my belt over the last 13 months I have had zero issues with police or anybody else on the road (beyond the occasional angry person who's angry in general). In New Zealand the legal limit is 250watt continuous, I am obviously a whole heap higher than that but nobody seems to care so far. I have had positive interactions from countless people who all ask the usual questions, plenty ask where they can buy one.
The bike as it stands owes me something in the region of $5,500 NZD all up. While that scares a lot of people off, it's very possible to achieve similar performance for a whole lot less. In my case I spent more for smarter solutions that were under-stressed and over-specced in the interest of reliability. I don't NEED 10kw or 1.8kwh of capacity - but it sure makes life easier sometimes.
Any questions? Anybody want me to expand on anything?