yes you can. but your tax liability has to be high enough to utilize both credits. the solar credit is used first then the EV credit so if you don't have a large enough tax liability the excess EV credit is permanently lost while if there is a remaining unused Solar credit it can be carried forward.
in the following year, the same rule would applies. first, any carry forward of solar credits is used, and then if you buy a vehicle qualifying for the EV credit that is used to the extent of any remaining tax liability. any excess EV credit is lost.
this assumes the purchase of the EV is personal and there are no other tax credits.
