andrew.box
100 W
Hey folks, does anyone here have experience putting together something like this and setting custom voltages for cell cutoffs and balancing initiation and using higher current off chip balancing?
https://sourcelion.wordpress.com/2014/07/20/battery-management-system-ltc6802-arduino/
Eg any pcbs built up to allow using higher current balancing? Or some working code beyond what's shown here?
I'm thinking of getting a Volt EV 12 cell module to play with setting up a sort of inexpensive "power wall" type of battery backup and it seems charging above 4.1 drastically shortens the life of those cells.
One possibility is just to check balance periodically manually and not have any control circuitry for that. Then just get a CC/CV charger set to 4.05 per cell, maybe set up a LVC alarm and cut of using an arduino and a relay, and call it good.
But it would be neat to have something more like a full balancing BMS if I can get something setup that will allow changing/programming over and under charge voltages so I can stay in the middle range of the battery SOC.
Is it correct that the behavior of this chip will be to initiate balancing through the S pins for each cell that hits the user defined high voltage point? Need to re-read the spec sheet I guess. It's a long one...
For some reason I don't see any microcontroller based "open BMS" sort of projects that weren't abandoned long ago. It seems like there'd be a huge use for this sort of thing by the community here and also the DIY power wall folks and it would be worth documenting something, getting some pcbs made, etc. But perhaps that's a naive assumption. Clearly BMS projects tend to spiral out of control with complexity. It's no simple task and impossible to please all potential constituents.
Any thoughts or tips are welcome. Thanks.
https://sourcelion.wordpress.com/2014/07/20/battery-management-system-ltc6802-arduino/
Eg any pcbs built up to allow using higher current balancing? Or some working code beyond what's shown here?
I'm thinking of getting a Volt EV 12 cell module to play with setting up a sort of inexpensive "power wall" type of battery backup and it seems charging above 4.1 drastically shortens the life of those cells.
One possibility is just to check balance periodically manually and not have any control circuitry for that. Then just get a CC/CV charger set to 4.05 per cell, maybe set up a LVC alarm and cut of using an arduino and a relay, and call it good.
But it would be neat to have something more like a full balancing BMS if I can get something setup that will allow changing/programming over and under charge voltages so I can stay in the middle range of the battery SOC.
Is it correct that the behavior of this chip will be to initiate balancing through the S pins for each cell that hits the user defined high voltage point? Need to re-read the spec sheet I guess. It's a long one...
For some reason I don't see any microcontroller based "open BMS" sort of projects that weren't abandoned long ago. It seems like there'd be a huge use for this sort of thing by the community here and also the DIY power wall folks and it would be worth documenting something, getting some pcbs made, etc. But perhaps that's a naive assumption. Clearly BMS projects tend to spiral out of control with complexity. It's no simple task and impossible to please all potential constituents.
Any thoughts or tips are welcome. Thanks.