Around here we have auctions of amazon return items. Sometimes they put together big lots of broken items which I love to bid on because people tend to give up way too easily and alot of it is easily fixed.
So I bid on a lot and won it. It was a gold mine. There was an RX580 8Gb GPU among other things, but also an xprit electric scooter.
It kind of worked but eventually failed completely. Opened it up and found it was full of water. Yay. The pack was a pretty standard 10s3p scooter pack, so I recovered the good cells from it and then I had an idea. Why not use my pack building skills to make this thing absurd?
So I got a new controller with speed limits which can be modified and built a 13s5p pack. I had to print a lift kit to make the battery compartment bigger. It was a fun ride but I melted the little stock motor in about an hour.
So I kept going! Why not make a dual motor machine? I bought a new 1000W 10" hub motor, a xiomi m365pro 350W hub motor, and another controller. I cut the back end off the machine, because the new bigger motor would not fit, and I fabricated and welded up a new back end. Painted it to look nice.
I bought an external battery box and built another 13s5p pack and mounted it to the stem of the scooter using a battery box.
First ride was yesterday. I synched the motors up by using a common throttle and tuning the speed limits to balance the different characteristics of the motors. I can run either motor or both together.
Shoots like a bullet, tops out at 41kph with current tuning which is not max power, and a 20km ride barely hit 20% of the total pack capacity (which is around 1kwh). 45 degree slopes no problem. I still need to make an offset plate to pretty up the position of the rear mudguard, but that's about it.
This project was fun.
So I bid on a lot and won it. It was a gold mine. There was an RX580 8Gb GPU among other things, but also an xprit electric scooter.
It kind of worked but eventually failed completely. Opened it up and found it was full of water. Yay. The pack was a pretty standard 10s3p scooter pack, so I recovered the good cells from it and then I had an idea. Why not use my pack building skills to make this thing absurd?
So I got a new controller with speed limits which can be modified and built a 13s5p pack. I had to print a lift kit to make the battery compartment bigger. It was a fun ride but I melted the little stock motor in about an hour.
So I kept going! Why not make a dual motor machine? I bought a new 1000W 10" hub motor, a xiomi m365pro 350W hub motor, and another controller. I cut the back end off the machine, because the new bigger motor would not fit, and I fabricated and welded up a new back end. Painted it to look nice.
I bought an external battery box and built another 13s5p pack and mounted it to the stem of the scooter using a battery box.
First ride was yesterday. I synched the motors up by using a common throttle and tuning the speed limits to balance the different characteristics of the motors. I can run either motor or both together.
Shoots like a bullet, tops out at 41kph with current tuning which is not max power, and a 20km ride barely hit 20% of the total pack capacity (which is around 1kwh). 45 degree slopes no problem. I still need to make an offset plate to pretty up the position of the rear mudguard, but that's about it.
This project was fun.
. 20k ride still barely hit the battery. I think my range is somewhere in the 60-80k range.