[RE-wrenches] Relay for 48v Vent Fan

Rich Nicol rich at solartechvt.com
Fri Aug 9 03:58:55 PDT 2013


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-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at 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:Allan at positiveenergysolar.com> Allan at 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 






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