Not very often at all, I set my house up on a near by lake and pretty much leave it for weeks before moving it then sit there for weeks, and I go out every day after work and fish a few hours , and I leave my heat on all winter, problem is if it’s really really cold the battery is dead (from the furnace running) the next day I get there , or if I miss a night and don’t go out, I run my generator every night I’m out there but I want the battery to last till then