Originally Posted by DeepFrz
Xantrex has a unit. May be more than you need as well though. Freedom Sequence.
They may all be more than I need. I can get by with something that just disconnects circuit "A" when circuit "B" comes on. Disconnects the water heater when the resistance heat element comes on. I don't need to monitor
current or have a sophisticated list of priority circuits and time delays.
Most of my career was in electric
and at one time I had the tools and access to parts
to easily construct such a device. I've been out of it for twenty years and my tools and parts
are gone so it's more difficult now.
All I need is to connect a small transformer to the same leads as the heating element, run the low voltage from the secondary of the transformer to a relay near the water heater and connect it so that when the relay is energized the water heater circuit is opened. The difficulty is finding the parts and mounting them to be ABYC compliant (safe). All the 120 volt stuff has to be enclosed.