Re: [electricboats] Anyone uses a used EV car battery for powering ?

Back again to your question "How", I would elaborate that I used unmodified Enerdel THINK 3kw modules (30-49v, ~42v nom), with each half-module connected in a 20P arrangement across the pack.  Each has a 10amp (or was it 20?) fuse to ensure against any external short from destroying any battery and also to keep each battery from taking down the mains.  BMS cards are original Enerdel (20 of them), powered by 12vDC when powered and data and programming via dual CAN bus communication with an Arduino DUE-based controller with SW I wrote.  It can be used to just get the latest data from all 240 cell pairs or to manage the cells (BMS) or can be arranged to control charger automatically and do the BMS.  The latter is currently not set up, but I did have that working once (until I discovered a relay had failed shorted due to lack of sufficient suppression).

I only do BMS balancing now about every 6-18 months, or maybe 2-7 charge cycles.

 

In case this helps…

 

From: electricboats@groups.io [mailto:electricboats@groups.io] On Behalf Of Carsten via groups.io
Sent: Thursday, June 3, 2021 8:31 AM
To: Electricboats <electricboats@groups.io>
Subject: [electricboats] Anyone uses a used EV car battery for powering ?

 

Scouting for a useful and low-cost battery bank, I would like to know - are some of you using a used EV car battery (50-80% remaining) for powering your boat ?

 

If so, how ?

 

I would like to wait to spend BIG bucks for a large new bank, so this might be an alternative, until the battery technology has come up at a higher level.

 

Cheers,

Carsten