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I have one. Although I've never used it other than testing it. I ordered the kit, but they sent my an assembled one. Well made. It operates a relay above or below a set voltage. You can set it to trip on a rising or falling voltage. and it has a wide adjustable hysteresis.
I have the instructions and diagram, but I'm not sure I'm allowed to post them here. I think I've seen them posted other places.
May be overkill for what you want to do.