Class B van life, 4 days off-grid: Lights (50Wh), water pump (40Wh intermittent), 12V fridge (300Wh per day), phones and laptop (200Wh), no AC. Total: about 600Wh per day. A 1,500Wh unit covers 2.5 days alone, longer with 200W of solar. Jackery 1500 Pro is the sweet spot here.
Class C travel trailer, weekend campground with hookups + boondocking returns: Microwave use (15 min per day at 1000W = 250Wh), rooftop AC for 2 hours per day (3,000Wh), lights and fridge (500Wh). Total: about 3,750Wh per day. A Bluetti AC200MAX (2,048Wh) with 400W of solar covers one day at a time with daily recharge.
Full-time fifth wheel, 7 days dry camping summer: Two 13,500 BTU rooftop ACs (run staggered, 4 hours each per day, 6,000Wh combined), residential fridge (2,500Wh per day), lights and fans (500Wh). Total: about 9,000Wh per day. Requires a stacked system (Bluetti AC300+B300 expanded, or EcoFlow Delta Pro Ultra) with 1,000W+ of rooftop solar plus portable panels.