I am not sure what your conservative use of power means but my wife and I camp for over a week at a time in national parks with a single quality Gr 27 battery and a single Eu1000 generator that I run every morning during breakfast and cleanup. We don't use an inverter because we can manage fine without a microwave or electric coffee brewer. We find it fun to figure out different innovative ways to reduce electrical consumption rather than doing the same old way we do when we have electricity at our camp ground. I manage with a clamp on Ammeter and DVM and even make full use of the trailer's led battery monitor.
Dick