Engine room blower electrical connection

[elias]

Before I make a try that I might regret …
I want the ventilation to start when I push the on button on the motor control panel , anyone had tried that before ?

[Yngmar]

No, but shouldn't be difficult. As those fans can draw a few amps, I'd advise using a relay, then you won't have issues with drawing that power over potentially undersized cables from the engine loom.

[elias]

True , the one I have in mind is around 4.5amps , and my cables will be almost undersized for that length … anyway I was thinking to draw from the alternator cable on the battery splitter victron

[kavok]

I describe mine installation:
take power from an f free button and go to the fan through a thermostat I set to start at 50 Celsius degrees and stop at 47.
When I go on the boat,  I push the f button and fan start and stop when is really necessary in automatic mode.

[elias]

Hmm… Very good idea , the 51 threshold s by guessing or is the proper ambient temp for an engine room?

[kavok]

About 50 degrees is good temperature at the hight of water filter. But you  can set  thermostat start and stop as you want. Note the temp sensor at the left of water filter. You find the thermostat cheap on Amazon. Take note that the engine became warmer when you stop it for the latent heat effect, because sea water do not circulate. It is better have a lower piping for fresh air intake and an hight piping to collect hot air.
In the engine room the temperature change a lot from bottom to top.
Be sure to isolate  engine room ceiling to avoid hot air go in the  deck counter mould.
Ask me if you need.

[SYJetzt]

At which position is the warm air blown out? Did you cut any new holes?

[kavok]

Two new holes on the stern, one for fresh air, one for hot air. Protected by Vetus SCIROCCO Cam Shell Vent

[tiger79]

My Cruiser 37 has the engine blower outlet on the port side of the drop-down transom opening.  If motoring in cold weather, sitting at the port wheel is preferred, as there's a stream of warm air coming out!

[elias]

Nice , mine has already 4 vent holes with grilles and adaptor for I think 70-75mm tube if I am correct , one is taken from the diesel heater as fresh cold air inlet , so I ll use a small inline blower to direct the heat out and leave the fresh coming in from the negative pressure of the other 2 vents , …I believe there are more small vents around and beneath the deck and railing but it doesn’t rain often here so I can’t find them