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Thanks to all for the thoughtful replies. Thanks and wish I'd had your thoughts a few months ago . . . would have saved me a few hours. In the end, that's basically what I did. I found a voltage sensitive relay on Ebay for $12.

The inverter has some dry contacts and those are what I used initially. I ran a 24v lead to them and used a simple SPDT relay to power the heating coil. The issue was that didn't allow for using the Sterling B2B as well. Ultimately, what I did: I found a cheap voltage sensing relay on EBay...

Well, that would've been a great option if I didn't already have my controller.

I used the dry contacts on the Growatt initially and that worked fine. The issue was that it didn't include the B2B charging option. In the end, I found a simple, cheap relay on EBay that solved everything.

I'm sorry if this had been answered already. I searched the forum a few times but couldn't find a clear answer. I'm relatively new to this topic (I've had grid-tied home solar for 17-18 years) and not familiar with all the newer components and related issues. I lucked out and am buying a set...