humperdingle Posted April 14, 2016 Report Posted April 14, 2016 Hi, I received two cooling fans yesterday. I ordered 5v fans so I could run them off either 4xAA batteries or a phone charger pack. They sent me 12v fans! No problem, they've refunded the cash and i've reordered somewhere else. But what can I do with the 12v fans? Two 9v batteries wired to make 18v would just burn out the fans, i'd imagine, and 8xAA would be too heavy for the lid? Would be a shame to throw them away. Quote
ukswrath[Staff] Posted April 14, 2016 Report Posted April 14, 2016 9v will work for both fans, they will just turn slower. Quote
humperdingle Posted April 14, 2016 Author Report Posted April 14, 2016 9v will work for both fans, they will just turn slower.You're right, of course... My test 9v battery was only showing 7v, so wasn't even making the fan twitch! The 9v might work better as they'll be a bit lighter, and I can put a fan and 9v on each side of the lid. I read somewhere that running a 12v fan with 9v supply makes the fan run a bit louder? Quote
ukswrath[Staff] Posted April 14, 2016 Report Posted April 14, 2016 You're right, of course... My test 9v battery was only showing 7v, so wasn't even making the fan twitch! The 9v might work better as they'll be a bit lighter, and I can put a fan and 9v on each side of the lid. I read somewhere that running a 12v fan with 9v supply makes the fan run a bit louder? 12v fan louder powered by a 9v battery louder? 5v fans with 9v battery maybe. The loudness is generally created by the whirling of the fan and air, the faster it spins the louder it gets. A 9v battery powering a 12v fan should theoretically cause the fan to turn slower, decreasing audio levels. But you're correct regarding you're first statement, a single 9v probably may not be able to operate two 12v fans. One for one it is then Quote
humperdingle Posted April 14, 2016 Author Report Posted April 14, 2016 12v fan louder powered by a 9v battery louder? 5v fans with 9v battery maybe. The loudness is generally created by the whirling of the fan and air, the faster it spins the louder it gets. A 9v battery powering a 12v fan should theoretically cause the fan to turn slower, decreasing audio levels. But you're correct regarding you're first statement, a single 9v probably may not be able to operate two 12v fans. One for one it is then I dunno, something about optimum RPM maybe? A test with the fan and battery temporarily placed in the helmet seems OK. Placed at the bottom rear of the helmet, it moves air around to the front nicely, and isn't loud at all Quote
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