Where can I get a 12V timer switch? - SailNet Community
 1Likes
Reply
 
LinkBack Thread Tools
post #1 of 20 Old 03-30-2012 Thread Starter
Closet Powerboater
 
MedSailor's Avatar
 
Join Date: Mar 2008
Location: Anacortes PNW
Posts: 3,556
Thanks: 256
Thanked 111 Times in 100 Posts
Rep Power: 8
 
Where can I get a 12V timer switch?

I want to install an engine oil pan heater and it would be most convenient if I could have it on a timer switch. I have other items that would be amenable to a timer switch such as the propane solenoid.

Can I use one of these household ones or does it have to be a 12V switch?



I've owned cars that had the defroster on a timer (that was not adjustable) so I suppose this could be an option, though I'm not sure how to find one of those either.

MedSailor

I have a sauna on my boat, therefore I win.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
MedSailor is online now  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 20 Old 03-30-2012
Senior Member
 
asdf38's Avatar
 
Join Date: Jul 2010
Posts: 772
Thanks: 1
Thanked 9 Times in 9 Posts
Rep Power: 6
 
Re: Where can I get a 12V timer switch?

I don't see why not. Mind the current rating of course. When it comes to relays switching power DC is harder than AC but 12V is so much less than 120V that it should basically cancel. In-fact as a reference point the Bluesea switches I just put in my panel have this rating:

10A@250V AC, 15A@125V AC, 15A@12V DC

Note the 15A rating is the same for 125V AC as it is for 12V DC. That should roughly hold across other switches. The challenge with DC is that the voltage is constant whereas AC always crosses 0. If the switch arcs after breaking current the AC will extinguish when it crosses 0.
asdf38 is offline  
Quote Quick Reply Share with Facebook
post #3 of 20 Old 03-31-2012
Senior Member
 
Join Date: Sep 2009
Location: Kingston Washington
Posts: 530
Thanks: 0
Thanked 3 Times in 3 Posts
Rep Power: 6
 
Re: Where can I get a 12V timer switch?

I agree. It's a spring timer and contacts. Having a lower voltage only means you've got extra margin on the insulation. I think if there's any issue its using the switch in a humid marine environment where it's internals may corrode.

Walt Elliott
Kingston WA
Puget Sound
Cal-29
Waltthesalt is offline  
Quote Quick Reply Share with Facebook
post #4 of 20 Old 03-31-2012
Senior Member
 
mitiempo's Avatar
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,498
Thanks: 0
Thanked 96 Times in 87 Posts
Rep Power: 8
   
Re: Where can I get a 12V timer switch?

Lower voltage but higher current probably.

Brian
Living aboard in Victoria Harbour
mitiempo is offline  
Quote Quick Reply Share with Facebook
post #5 of 20 Old 03-31-2012 Thread Starter
Closet Powerboater
 
MedSailor's Avatar
 
Join Date: Mar 2008
Location: Anacortes PNW
Posts: 3,556
Thanks: 256
Thanked 111 Times in 100 Posts
Rep Power: 8
 
Re: Where can I get a 12V timer switch?

Quote:
Originally Posted by Waltthesalt View Post
I agree. It's a spring timer and contacts. Having a lower voltage only means you've got extra margin on the insulation. I think if there's any issue its using the switch in a humid marine environment where it's internals may corrode.
A spring with contacts. That makes sense.

The second part you mention, that you have an extra margin, makes me think otherwise though. It takes a lot more copper to transmit amps without heat than it does at 120V. That's why boat cables are so big. If it's rated for 20A at 120V it may not take 20A at 12V without melting, right?

It's late, I'm not sure I have that last bit right. Might have to run it by Ohm's law after coffee in the morning and see how it stands up to the light of day...

MedSailor

I have a sauna on my boat, therefore I win.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
MedSailor is online now  
Quote Quick Reply Share with Facebook
post #6 of 20 Old 03-31-2012
tap
Senior Member
 
Join Date: Apr 2009
Posts: 176
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
 
Re: Where can I get a 12V timer switch?

If it's rated for 20A at 120V then it will do 20A at 12V too. The issue is that a 1kW heater that uses 120V would draw about 10A or so. If it used 12V, it would be need near 100A.
tap is offline  
Quote Quick Reply Share with Facebook
post #7 of 20 Old 03-31-2012
Junior Member
 
Join Date: Dec 2011
Posts: 28
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Re: Where can I get a 12V timer switch?

Could you not use an electronic timer or at least hook it up to see if it works . Could you go through an inverter?
ron_hudson is offline  
Quote Quick Reply Share with Facebook
post #8 of 20 Old 03-31-2012
Senior Member
 
Tanley's Avatar
 
Join Date: Aug 2009
Location: Boston
Posts: 259
Thanks: 0
Thanked 5 Times in 5 Posts
Rep Power: 6
 
Re: Where can I get a 12V timer switch?

LED lighting, soundproof, Sailor's Solutions Inc.
Tanley is offline  
Quote Quick Reply Share with Facebook
post #9 of 20 Old 03-31-2012
Reward for lost Kraken!
 
hellosailor's Avatar
 
Join Date: Apr 2006
Posts: 11,481
Thanks: 5
Thanked 132 Times in 129 Posts
Rep Power: 11
   
Re: Where can I get a 12V timer switch?

The spring timers are almost impossible to find these days, but Ace hardware still carries them, and their web site sells them for about 1/3 less than the stores--with free delivery to your local store. (Great logic, huh?)

Electronic timers could be a problem if they are all solid state (no relay) and intended for use with AC. You'd have to check with the maker for specifics.
hellosailor is offline  
Quote Quick Reply Share with Facebook
post #10 of 20 Old 03-31-2012
Senior Member
 
bljones's Avatar
 
Join Date: Oct 2008
Location: South Coast Ontario
Posts: 8,469
Thanks: 35
Thanked 90 Times in 80 Posts
Rep Power: 8
   
Re: Where can I get a 12V timer switch?

Why would you want it on a timer?
Unless you are seriously sub-zero for extended periods, there really is no need for proplonged or timed use on a pan heater- besides, since most spring timers have only an hour duration, if you will be gone from the boat for any length of time, the timer is almost useless.If you want a warm pan for ease of starting, simply plug your heater in before starting, while you are prepping the boat for departure.
If you are aboartd, and want to periodically warm up the oil for whatever reason, what I would do is set my watch, my alarm clock, the alarm on my laptop, whatever, plug in the heater, and when the alarm goes off unplug it. Done. For free.


Or just solve the whole problem by rolling Baffin Island style- start your motor in October. Don't shut it off until May.
mitiempo likes this.

It's 5 o'clock somewhere:


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
bljones is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Advice to an Offshore First-Timer administrator Seamanship Articles 18 12-12-2014 06:04 PM
First timer with chartering questions j_ro Chartering 6 11-22-2011 05:44 PM
Old timer from Neu Yawk jdeatsch Introduce Yourself 3 10-22-2010 07:05 PM
Only first timer once twoblocktom Introduce Yourself 4 09-21-2009 05:27 PM
First timer needs advice GenesisCaptain Chartering 14 07-16-2009 04:10 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome