Battery dehumidifiers

[billyfish]

Someone must make a battery dehumidifier ?

 

[PaulRainbow]

Someone must make a battery dehumidifier ?

Would use too much power

 

[Boater Sam]

Why would you want to dehumidify a battery? They are a wet cell construction.

Oh, You want a 12v one? Never seen one, can't imagine that there is much market for one. Compressor current draw at 12v would be high, and its DC not AC, same problems as a 12v fridge.
Fridges use a sequential switching system, electronic, puts the price up.

 

[penfold]

No reason a 12v dehumidifier couldn't be made, but the current draw would flatten a battery in a day, so no-one makes one.

 

[Stemar]

Here you go

Kontrol Streamline Moisture Trap 1Ltr - Screwfix

 

[bob the ancient mariner]

Here you go

Kontrol Streamline Moisture Trap 1Ltr - Screwfix

looks very interesting, will give them a try

 

[billyfish]

 

[billyfish]

I've got four of the crystal type on board but they don't keep up. Better get some more . Or would rather buy the crystals in bulk and hang a bag over the sink . What are they .

 

[johnalison]

I used to use the crystal ones when I had a Sadler 29. In those days I could take all the furnishings home and seal the boat, when the crystals were perfectly adequate. Nowadays I have to us a dehumidifier to get enough effect, but I still put a crystal unit in the cockpit locker because it contains the battery charger, a previous unit having suffered from damp.

 

[ylop]

Here you go

Kontrol Streamline Moisture Trap 1Ltr - Screwfix

Probably calcium chloride, they make a hell of a mess if you forget you left them on the saloon floor and kick them when finding the power for the lights! I had some drinks cans in the bilge below the floor and am pretty sure this contributed to their messy failure - so be careful about materials if you just want to put them over a sink!

You can get a much bigger version thats about the size of a kitchen bin (plastic) for big spaces - these are fine for a cupboard but not really for a cabin.

 

[thinwater]

Someone must make a battery dehumidifier ?

Yes, some of the the Evadrya units actually run on 12VDC (converter) at 4-6 amps.

The trick is to run them on a timer. They will draw more water at night, when the temperatures are lower and the RH is higher.

Obviously, you need substantial solar or you need to be plugged in. That said, I ran on of these on a mooring for a season. I simply adjusted the timer to match the available solar.

Also obviously, creating a dry boat (zero leaks) is the first step. If you can't do that, ventilation will work better.

CaCl2 with remove a few pounds of water before changing ... which is trivial unless it is a small, sealed space. The dehumidifier with remove 50-100 gallons across the winter.

Yes, Petlier dehumidifiers can work in the winter. The plate freezes, which does it no damamge, and then it thaws when the sun hits the boat. Another reason to run them on a timer (defrost cycle).