Exhaust fan basement invertor/air compressor compartment.

June 03, 2018, 11:30:36 pm

See photo for the exhaust fan, and controller in electrical box next to it (button on bottom).

This compartment with compressor and invertor has been very hot this week with high temps and travel on hot roads. Also, while driving this week in 100 plus temps on hot roads, my Victron temp sensor said battery temps hit 109 at the high end.

The exhaust fan has never run since I owned the coach , except when I used a hair blow drier once on the bottom temp controller to test if it worked or not. (it did).

The design is that air is pulled in through ports under under the coach into the battery compartment, then the fan pulls/pushes out in this compartment to under the coach. So air in within the battery compartment, air pushed out from invertor compartment.

This blower fan is 110 volt, not 12 volt. I have not yet checked if it is wired into the invertor, or operates only on gen/shore power.

Pulling the bottom plate off of the cover on the electrical box where the temp button control is reveals a adjustable dial. It was set to come on at 115 degrees, and has a 20 degreee range so off at 95 degrees. I changed the dial to on at 98 degrees for now, so off at 78 degrees (it will be running all the time in this heat).

Here is what the adjustable temp controller looks like: Zoro Select Adjustable Fan Switch, 90-130 6UEE1 | Zoro.com

Cautionary note: It looks to me like this button temp controller is used to ground the fan motor? Pulling the top cover showed exposed bare wires about 1" above the spade connectors.

It is very easy to have these exposed wires make contact where you do not want it to. DO NOT PULL THE COVER off without first killing shore power, with no gen run, and turning your invertor off as an additional step until we verify whether or not this is also powered by the invertor. Take no chances, 110 volt wiring in that cover box. I cut back the way too much exposed bare wires on the two connectors to the spade connectors.

If you are having high heat in the invertor or battery compartment and have this exhaust fan (not all do), it may be worth the extra 110 volt load to turn the temp controller down to at least 105 or 110 degrees. I read on a older post I can no longer find that the fan pulls 4 amps. I can not verify that.

Re: Exhaust fan basement invertor/air compressor compartment.

Reply #1 – June 04, 2018, 09:25:43 am

Confirmed this morning that this exhaust fan is wired to work on the inverter. At least it is on our coach. And the bottom button temp controller passes positive power, not ground I believe ( not verified)

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