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post #11 of 19 Old 06-04-2019
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Re: Solar Ventilation

We have two in the head pulling in the cabin pulling in. Have replaced on 5years ago but have been very reliable. We have two dorados so ventilation is lot a problem, but we also have 4 Caframo fans worth their weight in gold as they move good volumes of air. They can be expensive but some of the sites have excellent sales on them if you pay attention.

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post #12 of 19 Old 06-04-2019
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Re: Solar Ventilation

We have a Nicro solar ventilator on our after deck that exhausts air from the quarter berth. We don't notice any particular odors from it in the cockpit or on deck. They would seem to dissipate over the stern, out of olfactory range. Our engine is located in the main salon under the table, so any smells from hot belts, diesel fuel, and the general bilge mingle there. Fresh air comes from a small vent cowl forward over the anchor locker and any open or partially opened hatches. The setup we have seems to work well to keep the cabin generally cool and odor-free. Keeping the bilge clean helps reduce odor issues. Rigging a sun awning can also help to make things a lot cooler.
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post #13 of 19 Old 06-04-2019
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Re: Solar Ventilation

Still just curious Trevor. Our boat is about the size of yours. Our weather is probably similar. When I open the boat it is sometimes a little warm. Open the front hatch and doorway and it takes a couple of minutes for the breeze to cool things off. Not enough breeze, use the cutting board or something similar to fan the heat out. On a very hot day I don't think a couple of little fans are going to do much. Have you actually experienced problems?
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post #14 of 19 Old 06-04-2019
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Re: Solar Ventilation

Originally Posted by paulinnanaimo View Post
Sorry to waste your time, I didn't think about engine odours being a problem. But I'm curious. Is this ventilation to cool in the summer or for removing condensation in the winter?
Not a waste of time at all these small solar fans do a superb job of moving air within the cabin to control condensation and odors. They are not really designed to provide cooling breezes. As I have indicated previously I have had to replace two of the nicro brand due to failure of the components, not the batteries and at A$300.00 a pop here in Aus not an inexpensive experience. Another poster has indicated his success with this brand and I congratulate him.
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post #15 of 19 Old 06-06-2019
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Re: Solar Ventilation

Whatever you do, don't buy a Nicro Solar minivent 1000 like this:

Loud, the slightest shadow makes the fan stop (since it includes no internal battery), doesn't move a lot of air.

I guess you get what you pay for. I bought it because it was a direct replacement for the non-functioning one on my boat. I definitely should have spent more and got one of better quality. LIke one of the day/night kind with an internal battery.
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post #16 of 19 Old 06-06-2019
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Re: Solar Ventilation

Here’s what I have done on two of my boats. I use 12v computer muffin fans connected to a solar panel. They come in all different sizes and CFMs. They will typically move much more air than the nicro style. I have a small 23 ft sailboat with one blowing out over the vberth and one circulating in the sail lockers. They draw very little amps and keep my boat fresh. Since they only work during the day, they do not draw in the moist evening air. Yes, you will have to do some diy wiring, etc but for the price and performance I am pleased.
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post #17 of 19 Old 06-07-2019
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Re: Solar Ventilation

I also have friends for whom the Nicro vents have worked well. For me, they junked out in less than two years twice over. We have a 22 foot boat with the vent in the forepeak. It sucks in air and exits through the companionway. I took the guts out of the Nicro and replaced it with a $10 USB fan that pushes three or four times the air. I got a cheap USB solar panel that only runs in the daytime when the air is not moist. Found that to be much better at drying sails than the day/night ones. The whole assembly unscrews for a solid port to be inserted when racing. There is an opportunity for someone to make money. I'm not the only one who has problems with the outrageously expensive Nicros.
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post #18 of 19 Old 06-07-2019
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Re: Solar Ventilation

If you have room, I would add dorade vents above the head. Works best if you are at anchor (always into the wind). The one over the head points aft, and the other one points forward. However, it would be lower profile, to use two mushroom vents. As others have said, if after ventilating the boat, you are still hot, use a fan that blows directly on you. In my sailing area, the water doesn't get too warm. After the engine cools off, the bilge is the coolest place on the boat. I would sleep down there if I could... just kidding.

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post #19 of 19 Old 06-07-2019
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Re: Solar Ventilation

I have a Nicro style solar vent and can't say I am thrilled with it. As posted above it is loud, moves minimal air and only works when in fairly full sun. If an when I redo this I think I may go the computer fan route and run of the main batteries and solar. The 4 inch fans I have for head vent draw about 90ma at 12v. Two fans hooked in series draws less than 50ma and are almost silent but move much more air than the self contained solar unit.

Big drawback of self contained units is they are not always on when you want them. Having 2 computer fans on a DPDT switch it can be set up to run them in series for low power low noise or parallel if you want to move some air quickly.
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