Solar comes in all flavors. Charging is totally dependent on the cars interface. 240 volts with a dryer interface tends to be 50 amps max. So 12 kw an hour. If car is 250 kw, then 20 hours. So close to three days unless the sun shines at night where you are.
My bad. That’s 250 mile range from about 75 kw battery in car.
So possible in a really sunny day with a 10 kw solar array.
... however, a Tesla adapter plug will limit it's draw to about 30 to 35 amps of that available current. The charging rate will be about 8kw/hour. That's about 35 miles of range added each hour.
The standard 115v wall outlet has the potential to add around 5 miles of range per hour with a 2 ton load. I'd suppose the Hummer is half again that, so it likely has range about 2/3 of that.