Before we can figure out how many solar panels you need, we need to figure out how much power you actually consume at your cabin. The best way to do this would be to add up all of the average usage of the electric devices and appliances in your cabin. Appliances should state in their owner's manual and often on a label. Now that we have a good idea of how much power we'll use when we're at the cabin, we need to think about how long we generally stay there. If you use the cabin an average of 2 days per week, then you don't need as much solar. Now that you at least have an idea of how much power you're probably using, add some buffer. You don't want to end up in a situation where you have less power than you need. If you're on a. Solar panels are usually rated to put out 150 to 370 Watts. And that output can vary a lot by size and type of panel. Plus, that's the output you can expect with direct sunlight. So to figure out. Now let's talk about power storage. For this part especially, you'll want to contact a local solar power company. You can save a bunch of money by installing your own panels and batteries if you're comfortable doing it, but you'll want.