Power: Using solar power is a great while camping. Portable solar power systems are inexpensive and a good size to bring along with you to your destination. Or installing solar power panels on your shed, for a more long-term style. The price for this can vary and a quote would be needed.
Generators can be an option for short term, as a source of backup power, are not designed to run continuously without end. Some models are made to provide power for up to eight hours, some twelve, and some can run for days on end. However, in no way should you keep your generator running for weeks, months, let alone years without rest.
Using devices than run off battery power is another option; smaller electronics can run for months on the same batteries. Plus using newer appliances are rated for less energy consumption.