Steve Lusardi wrote:
This is not a good idea. While it might work for a while, you have to make
absolutely certain that break occurs before make. Secondly, you would have
to use contactors that can handle 200 amps. They are very expensive and in
use, would be in serious danger of being trashed. Perhaps a 48 volt charger
is MUCH cheaper.
Steve

The last 250A continuous DC contactor I bought last year was around
£20. Vetus and Sidepower do this all the time.