If you want to do this correctly and use the Golf cart battery’s for load shifting and battery back up you would need a hybrid battery inverter. it can be set to turn on a smart load (sol-ark has a cool set up for this). My Schnider xw+ can be set to output a 12v signal at battery full level or high battery alarm (or low battery) that can be used for a contractor. You could use this set up to detect full battery’s and turn on a smart load like you golf cart charger to use up the power. It will also fake out the grid tie inverter to run when the grid is down (this is called AC coupling). The thing about hybrid inverters is that they contain a transfer relay that disconnects the load (or home) from the grid when the grid goes down and islands itself so that the solar can still run.
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