I use a portable solar power system for emergency back-up at home and also while camping. 12-V 120-AH deep cycle battery, 1000-W 12VDC-120VAC power inverter, 30-W solar panel. This will run a few lights, laptop computer, small TV, radio, mini-fridge, and other small stuff all night if needed, then can fully recharge with 3 to 6 hours of sunshine.
Works very well for tent camping or a small camp trailer set up. Will also provide emergency lighting and run the refrigerator at home for 10 minutes every hour overnight.
Once used it to run a 32" TV for several hours without excessive discharge of the battery, kept the Super Bowl on at my club during a power outage. Everybody there was buying my beers in appreciation, so I ended up with enough bar credit to just about pay for my little solar set-up.
Everything mounts on a small dolly, easily moved around. With the 12-V deep cycle battery it's also easy to jump-start a vehicle if necessary, and a power-port connection cord allows me to recharge the battery while running the truck in about 30 to 40 minutes if needed.
Total cost was under $300, so very practical for limited requirements.
While researching the concept and shopping for components I noticed that every company involved in the solar power industry uses the tax credit scheme as part of their sales pitches. That tells me that solar power is not economically viable on its own merits for general use.