FVEAA Forums

Member EV Projects => Conversion Projects => Topic started by: tom.hoffmann on February 18, 2021, 04:17:32 PM

Title: BMS for Parallel Battery Bank
Post by: tom.hoffmann on February 18, 2021, 04:17:32 PM

I'm in the midst of a EV boat conversion. Two Things:

1. Getting ready to order BMS. The batteries are Lifepo4, 2P30S, 96 volt, 280ah each, 50+ kwh total.
I'm thinking the BMS should be separated one per series group. i.e. one 30s BMS on each side. If one BMS trips out (low cell or something) I still have a 96v pack to limp home. Does this sound like a viable plan?

2. I'm thinking about equalizers rather than full BMS. Thoughts?
 
Thanks
Tom

Title: Re: BMS for Parallel Battery Bank
Post by: jeffrey.miller on February 19, 2021, 03:42:30 AM

Tom,

My opinion is that you don't want something that draws it's power from the cells themselves.  This is less of an issue on a car because in theory it gets regular use.  While I haven't owned an Orion BMS I can say that they have many rabid fans and they are local, based in Carol Stream if I recall.  https://www.orionbms.com/  I have seen their setup in action and it can bring you straight to a loose connection.  As I recall there might be one for sale in the for sale section of the forums by the one and only Bruce Jones. 

Jeff

Title: Re: BMS for Parallel Battery Bank
Post by: tom.hoffmann on February 19, 2021, 02:24:42 PM

Very good thought. Thank You