Yup, solar is just about useless in the winter as the sun is so far away you get almost nothing out of it. Saw a guy on youtube get rid of it and went with a dc to dc charger so the alternator charges the big lithium battery between trips, said you'd need so much solar it would weigh too much and defeat the purpose. No idea what you're supposed to do with a solar set up for a house aside from a generator that would be running all winter lol