Are these fans any good?

[Rhylsailer99]

12V RV Motorhome Exhaust Fan Roof Vent Ventilation Cooling Indoor LED Caravan | eBay
My solar fan only works when there is sunlight, and I'm thinking to replace it with the above wired fan.
My plan is to wire the fan to the solar controller so it spins through the night. My main issue is that my current fan is only extracting, and this seems to drag air through the engine bay into the boat creating what I can only describe a boat smell.
The air in my boat seems a lot fresher when I first enter the boat if the fan is set to blowing into the boat, the fan is currently located near the front of my boat.

 

[Dellquay13]

I have fitted these to my last two boats and been extremely happy with them. The first one needed a new rechargeable battery after about 7years.

The link is for info only, not to buy

Amazon.com

 

[Neeves]

12V RV Motorhome Exhaust Fan Roof Vent Ventilation Cooling Indoor LED Caravan | eBay
My solar fan only works when there is sunlight, and I'm thinking to replace it with the above wired fan.
My plan is to wire the fan to the solar controller so it spins through the night. My main issue is that my current fan is only extracting, and this seems to drag air through the engine bay into the boat creating what I can only describe a boat smell.
The air in my boat seems a lot fresher when I first enter the boat if the fan is set to blowing into the boat, the fan is currently located near the front of my boat.

We had 3 computer fans through the yacht, catamaran, all connected to a fridge compressor (we have one fridge and one freezer. We have ducted air from the bow locker with A/C ducting. Our cat was on a swing mooring so the bow was always to windward, whether on the mooring or at anchor. We thus had fresh air dragged into the yacht, sucked by a computer fan at the fridge, ducting then took the warm air from the fridge and pulled it to the freezer compressor and then ducted into the engine bay. The air in the engine bay was then pulled to a vent at the transom.

We thus had the air moving with the prevailing breeze and specifically any smells in the engine bay were not drawn into the accomodation.

It took time to install the ducting, much of it passes through the bilges, which were clean and dry and I had to drill a couple of holes with an appropriately sized hole saw in bulkheads. The computer fans draw nothing.

Most, all, compressors have a computer fan and we simply wired our extra fans to the same terminals and as the compressor cycled on and off the extra fans came on and off. We collected our computer fans, about 10cm square, from discarded computers (we have a council roadside collection for such stuff) - so they cost nothing). But you can buy them - they are usually very cheap.

Our motivation was making the compressors more efficient, rather than moving smells, by removing warm air generated by the compressors. But the system also kept the whole catamaran sweet smelling.

You could do the same sort of thing with solar fans but add further fans at the compressor for when the fridge was on. So use a solar fan to such air into the yacht at the bow, then duct to the fridge (with an extra fan at the fridge) then duct to the engine bay and out. If you had two solar fans you could use one to simply such into the yacht, at the bow, and the airflow will then allow smells to exit via the engine bay.

Jonathan