I have never used a solar panel, but I know of a few people who have. They help out a lot. They guy I knew fished every day and did not have a problem. He had a gas light, so he did not have a lot of power drain, but he did have a TV. I have seen a 3amp charger for about $50, and I have seen more expensive models as well. I think it would be worth $50, but if you fish a lot, more would be helpful
Good Luck!
HarryG