Drying a computer locker

Discussion in 'Electrical Systems' started by fallguy, Oct 13, 2020.

  1. fallguy
    Joined: Dec 2016
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    Location: usa

    fallguy Senior Member

    I have a Glendinning actuator in the stair steps of my catamaran. The actuator drives the throttle and clutch to 90hp ob by wire to the helm and from under the steps to the engine mechanically.

    The space also includes start batteries and a fuel filter.

    The actuators cost about 2k each.

    I'd like to setup some way to minimize the humidity in the chamber. The chamber is open for incoming lines to areas forward.

    I was thinking maybe something like a pc fan with an RH sensor/relay. It would only kick in when the RH was high inside the chamber and also would not drive my start batteries down; so would not kick in under low voltage.

    Anyone able to draw it up? A small bit of heat may help.


    I think I might try to use a gorevent as well, but need to research if the gorevent would allow a higher exterior humidity back into a drier chamber.

    If anyone has experience keeping lockers dry without access to heating systems; please coin in as well.
     
  2. bajansailor
    Joined: Oct 2007
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    Location: Barbados

    bajansailor Marine Surveyor

    I know nothing about Glendenning actuators, but it sounds like a complicated system to have - the 49' cat in my avatar has 2 x 150 hp O/B motors, and she just has simple Morse type control cables going from the engines to the flying bridge in round pipe ducts.
    I cannot remember the length of the cables, but I think they are at least 20' long.

    I think we got them from Lewis Marine (this was 20 years ago).
    https://orders.lewismarine.com/show_catalogpage.php?Book=Base&Year=2019&Page=537
     
  3. fallguy
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    fallguy Senior Member

    remember my cat is demountable; rather than trying to get cables adjusted each time; the by wire method is the route I am going; the actuators are already here
     
  4. bajansailor
    Joined: Oct 2007
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    bajansailor Marine Surveyor

    Righty ho - my apologies, I was thinking that the assembly would just be a one off occasion after you take her to the coast.
    Will you be dis-assembling her each year to bring her home for the winter?
     
  5. Rumars
    Joined: Mar 2013
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    Location: Germany

    Rumars Senior Member

    Pelican case (or similar 100% waterproof box, Al if heat transfer is needed) mounted into the compartment with the actuator inside. Waterproof cable glands for the electrical wires, corrugated rubber boot sealed on the morse cables. Toss some silica xerogel with indicator in the box, close the lid shut and inspect at least once a year.

    Goretex works by pressure or temperature differential, moist air will go in.
     
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  6. fallguy
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    fallguy Senior Member

    Yes. The cables will be well rigged.

    silica xerogel, thanks, will research

    No room for the Pelican case.
     
  7. Rumars
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    Rumars Senior Member

    I don't suppose you could make the whole compartment gastight?

    Silica can be bought in bulk and reused, after it changes colour you dry it in the oven and it's ready for another round. A big bag changed regularly will keep the compartment dry if it is reasonably watertight.
     
  8. fallguy
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    fallguy Senior Member

    it would be difficult, but possible to get it close; the problem is the hatch lid mainly...it is plastic and the rest of the thing is foam core; so condensation is more likely; it might be possible to put insulating foam on the lid..if it'd stick
     
  9. fallguy
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    fallguy Senior Member

    I like the idea of a humidistat relay. I could set it for say 60% and if the fans kicked on, I'd know there was water in the box.

    Right now leaning toward a tub of dessicant. Just trying to find the right dispensing method as I also don't want dessicant to fall down into a dry sump I have there...it is a tricky space..bit small
     

  10. Mr Efficiency
    Joined: Oct 2010
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    Mr Efficiency Senior Member

    There are various materials that absorb moisture, that are cheap enough. Just need to replace when they have reached saturation. Reusable after driving off the moisture with heat.
     
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