A lot depends on what you plan to do those weeks you disappear into the woods. I have 275 watts worth of solar feeding 2 grp31 AGM batteries and as long as I don't get more than a couple cloudy days in a row that will keep me charged. But I also have a DC compressor fridge and an automatic satellite dish to watch TV. If you replace all incandescent bulbs with LED's, keep the fridge on LP, use the furnace sparingly, and don't use any appliances to speak of, you could possibly get 3-4 days or more on a single grp27 before you need the genny to top it off. If you do any driving while in the woods, you may not even need the genny.