Welcome, Ben, to the OEM forum.
I don’t know what’s inside your diverter, but I’d be prepared to say that neither of your ideas ever had the slightest chance of working. Lowering the value of the c.t. burden would decrease the sensitivity of the c.t. so increase the current it needed to see to read the same value - i.e. the opposite to what you wanted. Half-wave rectifying the c.t. output would dramatically distort the waveform, reduce the rms value and do much the same thing, albeit less predictably.
If you’re up for a steep learning curve, look at the ‘Learn’ section here to see how we measure power and determine its direction, and then look at Robin Emley’s “Mk2 PV Router” website, download one of his sketches and look at how it works and how he does the same thing - but as an option. In normal use, his diverter can and does exactly balance the dump load. I’m prepared to believe that your diverter works in much the same way. I think the only way you’d change yours, if it’s not a setting that’s accessible by you as a user or by their “authorised” techie or installer, is to rewrite the software for it.
In our experience, most commercial diverters behave exactly as you describe. If you want a Mk2 PV Router, he’ll be re-opening his shop later this week.
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