Thought this might be of interest to the community. I have a MAC motor / 14S5P Jumbo Shark from em3ev.com converted hybrid which was sadly flooded in February, when the Brisbane river broke its banks and I wasn't home to move the bike.
After drying out I let it sit for ages. I figured it would be completely destroyed. After all, the live contacts and other parts of the ebike system had badly electrolysed. The MAC motor was full of water. The ESC had completely detached the positive terminal as well as the live wire on the main power switch.
I figured it was a write off but set about cleaning out the various bits and having a closer look.
The ESC cleaned up and after some reflowing work on the eroded solder joints everything powered up! The motor worked but started stuttering after a few days - this is when I pulled it off and opened it up and water went everywhere. Oops. Thankfully nothing had corroded badly and after cleaning and drying it out, it works fine (it needs new bearings but that was nothing new).
The battery was the part I spent the least time on initially as I figured it would be a total write off. The BMS was completely shot and a lot of the exposed metal and balance connections were badly corroded.
However, when I looked at the various voltages and re-balanced the cell groups, it held a charge pretty well!
I got in touch with em3ev and they were amazingly generous - they provided me a new BMS for shipping costs only! So, a massive shout out to them. I can also applaud the overall build quality of their battery. Bullet connectors and good quality components meant everything was easy to work with.
After resoldering a bunch of balance leads and beefing up the corroded areas around the cells things are working ok. I think it's lost about 20% capacity; two cell groups in particular are significantly down in performance.
But, overall, a win. I guess that's a testament to good quality components and not giving up on something just because it looks broken.
Thanks again em3ev for the replacement BMS!
https://photos.app.goo.gl/niagygYeAhxh1tAP7
After drying out I let it sit for ages. I figured it would be completely destroyed. After all, the live contacts and other parts of the ebike system had badly electrolysed. The MAC motor was full of water. The ESC had completely detached the positive terminal as well as the live wire on the main power switch.
I figured it was a write off but set about cleaning out the various bits and having a closer look.
The ESC cleaned up and after some reflowing work on the eroded solder joints everything powered up! The motor worked but started stuttering after a few days - this is when I pulled it off and opened it up and water went everywhere. Oops. Thankfully nothing had corroded badly and after cleaning and drying it out, it works fine (it needs new bearings but that was nothing new).
The battery was the part I spent the least time on initially as I figured it would be a total write off. The BMS was completely shot and a lot of the exposed metal and balance connections were badly corroded.
However, when I looked at the various voltages and re-balanced the cell groups, it held a charge pretty well!
I got in touch with em3ev and they were amazingly generous - they provided me a new BMS for shipping costs only! So, a massive shout out to them. I can also applaud the overall build quality of their battery. Bullet connectors and good quality components meant everything was easy to work with.
After resoldering a bunch of balance leads and beefing up the corroded areas around the cells things are working ok. I think it's lost about 20% capacity; two cell groups in particular are significantly down in performance.
But, overall, a win. I guess that's a testament to good quality components and not giving up on something just because it looks broken.
Thanks again em3ev for the replacement BMS!
https://photos.app.goo.gl/niagygYeAhxh1tAP7