I know of no MPPT with a load dump. But I have really only looked at genasun and Morningstar.
It turns out the MPPT charger and grid tie work together rather well.
If the batteries are hungry for power the MPPT charger will gobble up almost all of the available PV power. Then when the batteries are full the MPPT charge controller will go into stand by mode where it draws almost no power and then the grid tie will start soaking up that excess power.
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