This is a very good question. I always run out of FW before I run out of battery power. What I find is after 7 days I run out of clothes also so I need to do laundry. More specifically my wife runs out of clothes, I have "universal shorts" that I hike, bike, swim and fish in and can go much longer in warm weather. However after 7 days batteries are at 50%SOC, FW is about empty and clothes need to be washed anyways, so we go to a FHU CG with a laundry mat and dump, fill, recharge batteries, wash clothes and bedding. So water and laundry need to be solved before I worry about batteries or solar.
