kenobi66
100 µW
- Joined
- Apr 18, 2022
- Messages
- 9
Hi forum folks,
Knob here. I've got a terrific little customized electric Zapino. ('Vespa-ish') It's got a 72v 3000w motor driven by Li-Ion 40Ah batteries with BMS's, and a Lyen 12FET spd ctrl. It works fine, slower than desired but whatevs.
There's a problem with the new coulometer that I installed into the system. This one: (and see pics)
https://www.aliexpress.com/item/3256801686045873.html?spm=a2g0o.order_list.0.0.27f818028Mskp8&gatewayAdapt=4itemAdapt
It's listed as 72v-capable and seemed to work fine for a while. Then every week or so I'd charge up the LiIons and go for a ride, and the voltage read roughly 10% less. Then the next week it read another 10% less, and so on. These readings despite charging the LiIons with the supplied charger each week. Now here's the other mystery: eventually the voltage reading went all the way down to zero, yet the scooter has continued to run just fine regardless; same speed, same range. I've been riding it like this for a couple of months now and no deviant behavior.
Any idea what would cause these symptoms? Anyone else encountered this? My first suspect is a crappy, cheap sensor. Second suspect is that maybe it can handle only up to 72v as a firm upper limit, making any 72v system unsuitable since true full voltage will always be higher than that. Third: um, aliens?
Any help / suggestions greatly appreciated!
https://endless-sphere.com/forums/download/file.php?mode=view&id=316244
https://endless-sphere.com/forums/download/file.php?mode=view&id=316245
Knob here. I've got a terrific little customized electric Zapino. ('Vespa-ish') It's got a 72v 3000w motor driven by Li-Ion 40Ah batteries with BMS's, and a Lyen 12FET spd ctrl. It works fine, slower than desired but whatevs.
There's a problem with the new coulometer that I installed into the system. This one: (and see pics)
https://www.aliexpress.com/item/3256801686045873.html?spm=a2g0o.order_list.0.0.27f818028Mskp8&gatewayAdapt=4itemAdapt
It's listed as 72v-capable and seemed to work fine for a while. Then every week or so I'd charge up the LiIons and go for a ride, and the voltage read roughly 10% less. Then the next week it read another 10% less, and so on. These readings despite charging the LiIons with the supplied charger each week. Now here's the other mystery: eventually the voltage reading went all the way down to zero, yet the scooter has continued to run just fine regardless; same speed, same range. I've been riding it like this for a couple of months now and no deviant behavior.
Any idea what would cause these symptoms? Anyone else encountered this? My first suspect is a crappy, cheap sensor. Second suspect is that maybe it can handle only up to 72v as a firm upper limit, making any 72v system unsuitable since true full voltage will always be higher than that. Third: um, aliens?
Any help / suggestions greatly appreciated!
https://endless-sphere.com/forums/download/file.php?mode=view&id=316244
https://endless-sphere.com/forums/download/file.php?mode=view&id=316245