[EVDL] BMS question

2022-07-08 Thread EV List Lackey via EV
The following inquiry is reposted from the Solectria EV discussion list. I'll forward any responses back to that list. Thanks! > Looks like my CALB cells are getting close to the end of their lives. The > capacities have been changing quite a bit over the past several months. > The car itself i

Re: [EVDL] BMS question

2021-10-07 Thread Peter VanDerWal via EV
I was just looking into this recently. There appear to be two types of cheap BMS systems, ones that just equalize when the batteries near full charge (put a small load, 40-70mv, on cells when they get over 4.1V) and the other type is typically called an "Active Balancer" it runs continuously an

Re: [EVDL] BMS question

2021-10-07 Thread Lawrence Winiarski via EV
For just a few batteries, I'd look at what the Radio Control guys use.    I think they have built in BMS and some are programmable.Being as you are only going to have 4 (for 12 volt trolling), I think you could get a complete solution cheap.    I think they use differentterminology like "4S" for

Re: [EVDL] BMS question

2021-10-07 Thread steve sawtelle via EV
Thanks all for the advise and ideas. I joined the Electricboats list - excellent resource! There is also a PlugBoats website/journal which looks good. I borrowed our electronic load from work and will cycle a few batteries to see what I have. Good to know it may take a few cycles to see where

Re: [EVDL] BMS question

2021-10-07 Thread paul dove via EV
I don't know anything about BMS's but Lithium Iron Phosphate cells can experience capacity fade even if they have good voltage. I had some cells that sat around for a year and a half and showed good voltage but when I cycles them they only had 45Ah out of 100Ah they started with. I thought I ru

Re: [EVDL] BMS question

2021-10-07 Thread Rod Hower via EV
There are great resources for electric powered sail boats at electricbo...@groups.io https://groups.io/g/electricboats  On Wednesday, October 6, 2021, 07:25:44 PM EDT, steve sawtelle via EV wrote: I guess this may qualify as an old-school question now. About 12 years ago I built an el

[EVDL] BMS question

2021-10-06 Thread steve sawtelle via EV
I guess this may qualify as an old-school question now. About 12 years ago I built an electric motorcycle. I actually had it up and running, but other things got in the way and I am abandoning the project. The rolling chassis will get back it's ICE and I need to find a home for the 7" Jim Hust