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  #41  
Old 04-26-2013
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Re: Tiny Dehumidifiers

One of the nice things about the little Peltier dehumidifiers is that they have a small enough footprint to place them on the galley counter. I have mine Velcro'ed to the shelf behind my galley counter, so it stays in place even when we're heeling.

Draining into the bilge should work also. Realize that it's generally much cooler under the sole than it is in the cabin, so water that deposits there will tend not to re-evaporate. Leave your cabin sole covers in place to minimize transfer of heat or vapor.

I choose not to drain into the bilge because my bilge is bone dry (outboard motor means no leaky packing box).
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  #42  
Old 04-26-2013
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Re: Tiny Dehumidifiers

Quote:
Originally Posted by jimgo View Post
PDQ - I read your blog post and found it very informative. I'd be curious as to which is more effective, using a dehumidifier or using solar fans. I also wonder whether the set-up of the dehumidifier drain makes a difference. In Take5's case, the drain is to the sink, which is VERY important, because I believe that drains directly outside the boat. By contrast, I've read comments from people who drain into the bilge, with the expectation that the bilge pump will carry it out. But, if the dehumidifier drops the RH enough, doesn't the air become "dry" and won't the water in the bilge simply evaporate back into the boat's air? Essentially you're creating a closed loop.
* Huge advantage to dehumidifiers. A small unit can maintain 55% at low temperatures when operated 8 hours per day (for defrosting in winter). This is important for boats that have people breathing into them. When the heat comes on, the RH will be 35%, which though it sounds dry, is where it needs to be to prevent cold surface condensation at sub-freezing outdoor temps. A solar fan can only hope to hold you at ambient, which is no good if the air is much warmer than the water.

* The sink drain on my boat is above the water line and drains outboard. The bilge is dry. However, even if the water drains to the bilge the loop is not closed because the bilge is generally not well-ventilated to the rest of the boat. It is not as though a toilet, for example, prevents a dehumidifier from being effective in a house. It just adds to the challenge. The dehumidifier is removing far more water than is evaporating each day (I assure you that bilge water dries VERY slowly at 35F).
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  #43  
Old 04-29-2013
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Re: Tiny Dehumidifiers

Thanks! When I'm there, the ports/hatches are open and air is flowing, but I can see how that wouldn't always be the case for those living aboard or cruising. I hadn't thought about live-aboards. I'm typically more concerned about keeping the RH low when I'm not aboard, and that's why I was wondering if a fan or two might do the job, especially for those who don't have power.
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  #44  
Old 05-30-2013
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Re: Tiny Dehumidifiers

The Practical Sailor review of dehumidification methods hit my mailbox today. The Peltier type unit fared pretty well when modified to drain into the sink through a hose. Not as good as full-fledged compressor type, but much smaller footprint.
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  #45  
Old 07-04-2013
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Re: Tiny Dehumidifiers

We were in San Diego on a 47 footer last week. During the night the inside humidity goes up quite a bit. It doesn't bother me, but my wife has asthma and it triggered big time.
We started closing up every hatch which keeps the humidity down a little more but it's still pretty bad. It's obviously coming from the outside since the boat dries out during the day while sailing (hatch/ports open)
I was looking at buying a danby 70 and run it at night. I am just wondering if it can keep up with keeping the air dry at night.
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  #46  
Old 09-01-2013
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Re: Tiny Dehumidifiers

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Originally Posted by TakeFive View Post
After 3 years of reliable operation, my tiny dehumidifier stopped dehumidifying...

...This exact model is no longer available, but I ordered a very similar replacement, since I've been happy with this method for controlling humidity in the slip. I had rigged a flexible tube to dump the humidity down the drain, and I'll do the same for the new one.
Now that the season is waning, I thought I would post an update.

First, I'm happy to say that the exact model that I purchased three years ago is once again available for web order from Home Depot. At about $49, it's a good low-cost option.

Last April, when that unit crapped out, it was not available so I had to do with this other model from Amazon:
Amazon.com: Sunpentown SD-652 86-Watt Mini Dehumidifier: Home & Kitchen Amazon.com: Sunpentown SD-652 86-Watt Mini Dehumidifier: Home & Kitchen



The new unit has the same power brick as the old one, but has a larger aluminum fin for heat transfer, and appears to remove humidity a little faster than the previous one. Its large 2-liter tank typically fills in a week. I've attached a hose to it to drain into the sink, so it keeps going even if I don't make it to the boat for a week. Humidity in the cabin is typically 40-55%, and even on the most humid days it has never gone above 60%. (I have an electronic humidity sensor with memory, so I check frequently.)

In addition to the dehumidifier, I have two electric clip-on fans that keep the air circulating in the cabin, which I'm sure helps the efficiency of moisture removal. One blows forward toward the V-berth, and one blow back into the aft berth. The latter one also blows across the power brick, which really helps keep it cool since the dehumidifier draws a lot of watts for such a small device.

Overall I'm still very pleased with this arrangement, and for people who have shore power available I think it's a viable alternative to the Nicro solar vents. Those with larger or wetter boats might need two or more of the dehumidifiers to keep up with the moisture.
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  #47  
Old 09-02-2013
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Re: Tiny Dehumidifiers

I'm a big believer in these little dehumidifiers. I've been using one for many years. It's about the size of a loaf of bread. I had a horrible mildew problem until I installed it. It dropped the RH from about 80% down to just over 60% in my little cabin. I also just drilled a small hole in the tank, stuck a piece of aquarium air hose in, and ran the hose to the sink drain. No need for a thru-hull fitting in the tank.
I seem to need a new one about once a year. The fan died on my first one and I was able to replace it with a computer fan for about 12 bucks.
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  #48  
Old 09-02-2013
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Re: Tiny Dehumidifiers

Careful though

Sears Kenmore Dehumidifier Recall
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  #49  
Old 09-02-2013
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Re: Tiny Dehumidifiers

Quote:
Originally Posted by therapy23 View Post
The recalled humidifers are all the large heavy compressor type, manufactured by LG Electronics. They are a totally different design from the Peltier type dehumidifiers that are the subject of this thread.
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  #50  
Old 09-02-2013
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Re: Tiny Dehumidifiers

OH.

Sorry.
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