[RE-wrenches] battery box fan

[Allan Sindelar]

Larry,
Few relays are rated for 48V DC, as that DC voltage is high enough that
relay life is compromised by arcing of the contacts. However, the current of
the Power Vent is so tiny that this shouldn't be an issue. If you have an
old open-coil power relay with a 12V coil lying around the shop, use it.
Otherwise, an automotive relay is easy and cheap to use.

You may find it as easy to replace the 48V Power Vent with a 12V unit. There
the main issue is that the 12V and 24V Power Vents have a 2" diameter
exhaust vent, while the 48V is 3".

Allan at Positive Energy

-----Original Message-----
From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Larry Brown

Wrenches.

On an upgrade to an existing system, we just installed a Xantrex  
XW6048 inverter.  We have a 48 volt dc battery box vent fan that we  
used to run through the relay on the old SW5548.  The XW6048 has a 12  
vdc aux output so I assume we need to install a relay to run the fan,  
12vdc input, that will allow 48 vdc output
Any suggestions on what relay to use?

Thanks

Larry Brown
Sun Mountain