PV low vol fan reversible?

Drake · 01-25-11, 12:38 PM

Would any low volume PV powered fan be reversible? By switch,wire change? want to use one in solar fresh air intake and summer solar chimney design.

Piwoslaw · 01-25-11, 01:12 PM

Open it and reverse the (+) and (-) wires at the motor (not at the PV). May require soldering.

Daox · 01-25-11, 02:20 PM

Yeah, it'll blow in two directions by changing leads. They're not designed for it though. The blades have a curvature to them and it won't blow as much one way was it does another. You might want to find a way to just flip it around?

Xringer · 01-25-11, 08:11 PM

If it's a computer type fan, it likely has a bush-less motor.

If it does, it will not go backwards. But, it might release a
small cloud of smoke. (To signal it's demise).

01-25-11, 12:38 PM	#1
Drake DIY Guy Join Date: Jan 2011 Location: Mpls,MN Posts: 315 Thanks: 2 Thanked 17 Times in 17 Posts	PV low vol fan reversible? Would any low volume PV powered fan be reversible? By switch,wire change? want to use one in solar fresh air intake and summer solar chimney design.

01-25-11, 01:12 PM	#2
Piwoslaw Super Moderator Join Date: May 2009 Location: Warsaw, Poland Posts: 961 Thanks: 188 Thanked 110 Times in 86 Posts	Open it and reverse the (+) and (-) wires at the motor (not at the PV). May require soldering. __________________ Ecorenovation - the bottomless piggy bank that tries to tame the energy hog.

01-25-11, 02:20 PM	#3
Daox Administrator Join Date: Aug 2008 Location: Germantown, WI Posts: 5,525 Thanks: 1,162 Thanked 374 Times in 305 Posts	Yeah, it'll blow in two directions by changing leads. They're not designed for it though. The blades have a curvature to them and it won't blow as much one way was it does another. You might want to find a way to just flip it around? __________________ Current project - To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. & To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

01-25-11, 08:11 PM	#4
Xringer Lex Parsimoniae Join Date: Feb 2009 Location: Woburn, MA Posts: 4,918 Thanks: 114 Thanked 250 Times in 230 Posts	Reversing Polarity If it's a computer type fan, it likely has a bush-less motor. If it does, it will not go backwards. But, it might release a small cloud of smoke. (To signal it's demise).