Most Teardrop campers have some sort of power system. It could be as simple as a portable self-contained battery-inverter-charger, or could be a fully-equipped solar system hard-wired into the trailer. My house is completely off-grid (95% solar power + 5% generator supplement in the dark months) and my Teardrop has more-or-less a scaled-down version of …
Teardrop Trailer Travels 