Well there is but I doubt it works the way you think it would. There are basically two types of inverters: GTI and Battery. He could use a battery inverter to convert 60 VDC to 240 AC. Catch is it would require a set of 60 volt batteries with 3 to 5 times the capacity of the EV batteries.There must be inverters capable of taking in 60VDC and putting out 240VAC to run a normal ev charger, but obviously there would be an efficiency loss there.
However I do know of a way to do this as I do it with my 48 volt golf cart. But there are three major hurdles. The most important hurdle is any modification to the vehicle charging system will void the warranty.
Second hurdle is a custom designed charge controller. Third the vehicle BMS
OK what you can do is connect your solar panels so that the Vmp voltage is at least 10 volts higher then the vehicle battery end voltage. So if it is 240 volts, then you will need at least 250 out of the panels.
From there you build a custom charge controller, install it on the vehicle, or heck it can even stand alone.