If you want to inflate stuff at home, get a 120-volt inflator instead. They plug directly into your household electrical outlet.
The 120-Volt inflators tend to be more powerful than their 12-volt counterparts. Hence, they inflate things a lot faster. However, they still have limitations; they can inflate car tires (around 30 PSI), but lack the power to fill larger tires, like those on an RV (about 100 PSI).