Cascaded CTs solve distance problem between mains and Sunsynk
I tried the RS485 meter solution which worked for a while. I now have a CT solution which I prefer as there is no location, fuse or mains wiring to worry about. Hope it helps someone.
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You could also try my solution with a 2 core 6mm SWA cable buried in the ground between the two points, suitably terminated at both ends so you could connect it to a cable like I used with cascaded CT's. I believe this would work as the cable burden is slightly lower than what mine is (say 0.6 ohms). Anyhow I am a dinosaur and come from a substation background when you did not mix communications and control/protection so your solution is probably more up with the times. I guess the RS485 solution is more inline with the type test/G100 rules but as long as the DNO accept the solution - all good.