Inverters are sources of inefficiency and wastage. Try and run whatever possible on 12V
. This means swapping your DVD player for an iPad or similar tablet, swapping incandescent bulbs for LEDs and otherwise conserving energy.
In today's world, solar is cheap and easy to install. If that's not something you wish to do, then standalone solutions like, for example, the Goal Zero Solar Generator
can be a workable alternative. It's visually messier than installing permanent solar, but also more flexible, as the power pack can be used anywhere and the solar panels are portable.