EV Safe Charge Mobile Units with wind/solar
I suspect the solution lies with existing tech that is on the market and adapting it.
Description
Install portable Level 2 and DC fast EV-charging from EV Safe Charge, which are already on the market and couple them to onsite renewable energy capacity e.g. solar and wind turbines. I suspect you may need to employ someone to charge the EV Safe Charge's batteries during the day.