Thanks for the tip. To err on the side of safety is always a good thing!
I think Hillbilly is right - most any standard relay should work. I picked up a 6 pack of relays from Amazon.Thank you kind sir for assisting with this. Can you advise a relay to work with the dual voltmeter?? my machine may sit idle for a much as two weeks at a time and I wouldn’t want to run the batteries down inadvertantly.