Hi Sean

Yes, I wrote about this issue in my last article https://www.powermyhome.uk/pv-solar-panels/my-pv-solar-panel-epiphany.

Your idea sounds easy in theory, but PV installers will only do installations on-grid nowadays and would be problematic (safety-wise) to charge a single appliance in the way you propose as the charger would still need to be wired to the network for charging when the sun is absent.