Hi All We've used the 12v fans directly off the charge controllers for 12, 24 and 48v systems, but I like the idea of the 48v fan on this system since it moves a great volume of air than the 12 and 24v versions. Two 12 v fans may be a good way to go and it builds in a failsafe- if one dies the other will likely still be working. I'll also check out Grainger and Mouser for a relay that will work - thanks for the tip!
Rich From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Allan Sindelar Sent: Friday, August 09, 2013 12:25 AM To: RE-wrenches Subject: Re: [RE-wrenches] Relay for 48v Vent Fan Rich, We simply use 12V Zephyr vents on our 24 and 48V systems. One FM controller will power one 12V fan directly, or will run a 12V relay for more than one. Is that a solution for you? Allan Sindelar <mailto:al...@positiveenergysolar.com> al...@positiveenergysolar.com NABCEP Certified PV Installation Professional NABCEP Certified Technical Sales Professional New Mexico EE98J Journeyman Electrician Founder and Chief Technology Officer Positive Energy, Inc., a Certified B CorporationTM 3209 Richards Lane Santa Fe, New Mexico 87507 505 424-1112 office 780-2738 cell <http://www.positiveenergysolar.com/> www.positiveenergysolar.com On 8/8/2013 5:49 PM, Rich Nicol wrote: Hello Wrenches, Does anyone have any advice about what to use for a relay to power a 48 volt Zephyr battery vent fan using the 12 volt auxiliary output from the Midnite Classic Charge controllers. The fan only draws 6 watts but my problem is the 48 volt side of the equation. A supplier has recommend a double pole/double throw relay rated for up to 30 amps at 24 volts wired in series. I'm curious if anyone knows of a relay rated for 48volts (actually higher voltage since the fan is signaled to come on when the battery reaches gassing voltage) that would work in this application or if there is widespread agreement that the 24volt rated relay would work fine since we are requiring only minimal current and spreading between two contacts. As always, your input is greatly valued! Thanks, Rich _______________________________________________ List sponsored by Home Power magazine List Address: <mailto:RE-wrenches@lists.re-wrenches.org> RE-wrenches@lists.re-wrenches.org Change email address & settings: <http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: <http://www.re-wrenches.org/etiquette.htm> www.re-wrenches.org/etiquette.htm Check out participant bios: <http://www.members.re-wrenches.org> www.members.re-wrenches.org
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