[RE-wrenches] Relay for 48v Vent Fan

[Exeltech]

Mouser Electronics and Digi-key will also have these relays.

You don't need anywhere near that heavy a relay.  A fan consuming 6 watts at 48 volts equates to only 0.125 amps.  A small relay with contacts rated for 0.5 amp at 48Vdc will be more than adequate.  Get a relay with a coil of 500 ohms to 1K (or even higher) to minimize energy usage.


Dan


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On Thu, 8/8/13, jay peltz <jay at asis.com> wrote:

 Subject: Re: [RE-wrenches] Relay for 48v Vent Fan
 To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
 Date: Thursday, August 8, 2013, 7:09 PM
 
 HI Rich,
 Grainger will have 12v coil relays that will
 switch 48v.
 
 jay
 peltz powerOn Aug 8, 2013,
 at 4:49 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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