Some solar panels would be high on the list for me. Switching my interior incandescent lights to LED made a huge difference for me. I have not made the switch on the florissant bulbs and may not. I just don't use them that much any longer. When parked off grid, I use my cell phone or kindle for entertainment if not outside stargazing. The solar panels easily restore the batteries to a full charge.
I still have the twin 6v flooded batteries instead of newer 12v AGM because I didn't have the funds to change to a modern charge controller.