That means you would rarely if ever get a full 100 watts from a 100 watt solar panel. However, solar panels aren’t 100% efficient there will be days when the sun peeks in and out of the clouds. If your 20 inch box fan is typical it probably draws no more than 100 watts when running at its highest speed, and it would draw even less if you run it on low or medium. Here are two options for you to consider:ġ – The DIY “learn how solar works” solution But that shouldn’t be a problem in your situation because the building won’t heat up at night (it will actually cool off). Most off-grid solar installations do require batteries since the sun doesn’t shine at night and solar panels don’t generate electricity in the dark. Rick’s answer: That’s a great question Adam, and the short answer is yes. Note: I have a 20 inch box fan that would be perfect for this application. My question: Is there any way to run a fan off solar without having to buy a battery? And if the answer is yes, can you recommend the best solar panel to use that (hopefully) costs $300 or less? The problem is, I read that off-grid solar power setups have to have a solar battery in order to work, and those batteries are really expensive (I’ve checked). What I have in mind is mounting a solar panel on the roof of the building and using the electricity it generates to power the fan. I really don’t want to go to the trouble and expense of burying a power line between the two structures so I’m looking for an alternative. What I’d like to do is install a fan in the eve of the building to pull fresh air into the building while expelling the hot air, but there’s no electric service there to power the fan. I have a small outbuilding that’s located about 120 yards from my house. This outbuilding has a dark green roof and it gets extremely hot inside on hot summer days. Question from Adam: I hope you can answer a question about solar power for me. Note: The links in this post are affiliate links.
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