Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 30-05-2018, 18:54   #1
Registered User

Join Date: Jun 2012
Location: Victoria, Australia
Posts: 75
Electric Blanket on Modified Sine Wave Inverter

Getting into a cold bed at night can be discomforting, so why put up with it?

On our V-berth, a double blanket is out of the question, so we got our old queen where one side only worked, and cut out the inoperative side.

We sewed on some tapes to tie around the mattress and what we have in effect is a single blanket -- for my wife's side because she feels the cold shock more.

In any case, my bare feet touch her heated side and that's good enough for me.

Two single blankets won't suit because at the narrow end they would have to go one on top of the other, which may produce safety issues.

To power it, we use the house 1500 amp modified sine wave inverter. Blankets with electronic controls with fancy LED displays will probably NOT work with a MSW in our experience.

But a simple old fashioned on/off 1-2-3 mechanical controller should. It's not the heating elements which are the problem --but the controllers.

So, about 20 to 30 minutes before bedtime, I power up the inverter, and switch on the blanket. By bedtime it's warm, and we switch off it first then the inverter.

The blanket is about 60 watts, so it draws about 5 amps (the equivalent of
2 1/2 12-volt cabin lights before led came along). But since it's not on for the full hour, the total draw is a very manageable 1.6 - 2.5 amps. That's about 1 hour's worth of TV viewing for the battery bank.

How do we keep warm until bedtime in winter? -- our 2 kw planar diesel air heater. Love it, but that's another thread:
<a href="http://www.cruisersforum.com/forums/f115/planar-heater-purchase-and-installation-later-163934.html">click here</a>

Being on a boat, doesn't mean sacrificing basic comforts.
__________________

starcruiser is offline   Reply With Quote
Old 30-05-2018, 19:46   #2
Registered User
 
janice142's Avatar

Join Date: May 2006
Location: west coast of Florida
Boat: Schucker mini-trawler
Posts: 352
Send a message via AIM to janice142 Send a message via MSN to janice142 Send a message via Yahoo to janice142 Send a message via Skype™ to janice142
Re: Electric Blanket on Modified Sine Wave Inverter

Aboard Seaweed I opted for a 12volt electric blanket. It uses 35watts and runs for either 30 or 45 minutes, depending upon the setting I chose.




This article has details.

Janice142 article As Winter Approaches

You're correct about not sacrificing starcruiser... Decadence makes a world of difference. Enjoy, and happy cruising.
__________________

__________________
Janice aboard Seaweed, trawler life on a nickel budget...
janice142 is offline   Reply With Quote
Old 30-05-2018, 20:02   #3
Registered User

Join Date: May 2008
Posts: 2,540
Re: Electric Blanket on Modified Sine Wave Inverter

I use an electric mattress pad. Electric blankets lose much of their heat to the air, but the pad is insulated by the blankets (and bodies) on top. Once the mattress is warm, power use drops to almost nothing. On a very cold night, we leave it on all night and the batteries are none the worse to wear in the morning.
CarlF is offline   Reply With Quote
Old 31-05-2018, 09:38   #4
Registered User

Join Date: Oct 2006
Location: Tortola
Posts: 746
Images: 1
Send a message via Yahoo to bvimatelot Send a message via Skype™ to bvimatelot
Re: Electric Blanket on Modified Sine Wave Inverter

Crikey!! What amazing decadence!! And here's Me crawling out of my bunk with my thermal sleeping bag, crawling through the cockpit to get the propane bottle, warm it up between my thighs (still in sleeping bag) until gas will flow to make my morning cuppa...how the other half live eh?!!
bvimatelot is offline   Reply With Quote
Old 31-05-2018, 10:38   #5
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Jacksonville/ out cruising
Boat: Island Packet 38
Posts: 29,945
Re: Electric Blanket on Modified Sine Wave Inverter

Last Winer we got an electric “throw” cheap and use it with the inverter. It uses about 10 or 12 amps, I think.
Used it long enough to get South of the cold. This year Plan is to leave earlier and avoid the cold, last Winter wife wanted to not leave until after Christmas.
a64pilot is online now   Reply With Quote
Old 31-05-2018, 10:45   #6
Registered User
 
TreblePlink's Avatar

Join Date: Aug 2017
Location: Kentucky
Boat: 1969 Rhodes 28'
Posts: 307
Re: Electric Blanket on Modified Sine Wave Inverter

Heated motorcycle clothing is not very expensive and is efficient with 12 volts.
TreblePlink is offline   Reply With Quote
Old 31-05-2018, 23:14   #7
Registered User

Join Date: Jun 2012
Location: Victoria, Australia
Posts: 75
Re: Electric Blanket on Modified Sine Wave Inverter

Might be warm on the road, but don't fancy sleeping in motorcycle clothing.....heated or not!
starcruiser is offline   Reply With Quote
Old 01-06-2018, 02:52   #8
Registered User

Join Date: Apr 2007
Location: Australia
Boat: Island Packet 40
Posts: 3,546
Images: 7
Re: Electric Blanket on Modified Sine Wave Inverter

If you can put up with the smell and don't mind the odd flee a couple of decent sized dogs will do a pretty good job.
RaymondR is offline   Reply With Quote
Old 01-06-2018, 03:08   #9
Moderator
 
Jim Cate's Avatar

Join Date: May 2008
Location: cruising SW Pacific
Boat: Jon Sayer 1-off 46 ft fract rig sloop strip plank in W Red Cedar
Posts: 16,085
Re: Electric Blanket on Modified Sine Wave Inverter

Quote:
Originally Posted by RaymondR View Post
If you can put up with the smell and don't mind the odd flee a couple of decent sized dogs will do a pretty good job.
Have you a good source for marine quality 12 volt dogs?

Jim
__________________
Jim and Ann s/v Insatiable II back in Port Cygnet doin' the isolation tango.
Jim Cate is online now   Reply With Quote
Old 01-06-2018, 04:40   #10
Registered User
 
Captain Bill's Avatar

Join Date: Apr 2008
Location: Punta Gorda, Fl
Boat: Endeavourcat Sailcat 44
Posts: 2,769
Re: Electric Blanket on Modified Sine Wave Inverter

Be careful using an electric blanket or mattress pad on a modified sine wave inverter. I thought I had a simple 123 button control on one I bought, but it turned out it was solid state internally. I turned it on to warm up the bed and in 10 minutes the controller was a smoking pile of burnt plastic. I suspect I caught it just before it burst into open flames. I later found a warning in the fine print of the care instructions to never use it on a modified sine wave inverter. Of course those instructions we not anywhere on the package.
Captain Bill is offline   Reply With Quote
Old 01-06-2018, 06:04   #11
Registered User

Join Date: May 2006
Posts: 674
Re: Electric Blanket on Modified Sine Wave Inverter

Quote:
Originally Posted by Captain Bill View Post
Be careful using an electric blanket or mattress pad on a modified sine wave inverter. I thought I had a simple 123 button control on one I bought, but it turned out it was solid state internally. I turned it on to warm up the bed and in 10 minutes the controller was a smoking pile of burnt plastic. I suspect I caught it just before it burst into open flames. I later found a warning in the fine print of the care instructions to never use it on a modified sine wave inverter. Of course those instructions we not anywhere on the package.
As they're only around 60watts, just get the smallest sinewave inverter you can. I have a 150w one that runs on 12v and is sine wave for the car.
Fuss is offline   Reply With Quote
Old 01-06-2018, 13:15   #12
֍֎֍֎֍֎֍֎֍֎

Join Date: Apr 2006
Posts: 15,129
Re: Electric Blanket on Modified Sine Wave Inverter

There are 12 volt models, sold for RV and long haul truckers, both blankets and mattress pads. That eliminates any inverter issues.
hellosailor is offline   Reply With Quote
Old 01-06-2018, 14:50   #13
Registered User
 
Captain Bill's Avatar

Join Date: Apr 2008
Location: Punta Gorda, Fl
Boat: Endeavourcat Sailcat 44
Posts: 2,769
Re: Electric Blanket on Modified Sine Wave Inverter

Quote:
Originally Posted by Fuss View Post
As they're only around 60watts, just get the smallest sinewave inverter you can. I have a 150w one that runs on 12v and is sine wave for the car.
This is not problem anymore as I have retired and if the weather even hints at me needing an electric blanket I move south.
Captain Bill is offline   Reply With Quote
Old 01-06-2018, 16:15   #14
Writing Full-Time Since 2014
 
thinwater's Avatar

Cruisers Forum Supporter

Join Date: Nov 2008
Location: Deale, MD
Boat: PDQ Altair, 32/34
Posts: 7,058
Re: Electric Blanket on Modified Sine Wave Inverter

I would chose 2 fleece blankets and a nice comforter over an electric blanket any day. Amps don't matter, cost does not matter, the blanlets and comforter are simply... more comfortable. And I cruise through sub-freezing conditions. They are also more adoptable to other uses around the boat, through the seasons (retained heat cooking comes to mind).



I'm sorry, but is is simply a zero-value gadget to me. I wouldn't have one at home either. I've tried them and don't like them. Strangely, I like the cold bed. It feels fresh, and it only stays cold for a few moments.
__________________
Gear Testing--Engineering--Sailing
https://sail-delmarva.blogspot.com/
thinwater is offline   Reply With Quote
Old 01-06-2018, 16:25   #15
Registered User

Join Date: Apr 2018
Location: Coming to a Marina Near You
Boat: Hallberg-Rassy 49
Posts: 303
Re: Electric Blanket on Modified Sine Wave Inverter

Worth every penny. And won't set your boat on fire.

You can actually order one to fit your V-berth.
__________________

__________________
Professional Reality Checker
KeelMe is offline   Reply With Quote
Reply

Tags
electric, inverter

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not 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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Inverter - Modified Sine Wave vs Pure Sine Wave? PamlicoTraveler Electrical: Batteries, Generators & Solar 24 26-07-2015 07:40
Looking for a good quiet modified sine wave inverter sailorchic34 Electrical: Batteries, Generators & Solar 10 30-03-2015 17:28
True (Pure) Sine Inverter vs Modified Sine Inverter Alecadi Electrical: Batteries, Generators & Solar 19 05-05-2011 06:19
Modified or Pure Sine Wave Inverter / Charger ASIMPLELIFE Electrical: Batteries, Generators & Solar 2 04-10-2010 17:26
Pure Sine Wave vs Modified Inversion unbusted67 Electrical: Batteries, Generators & Solar 19 18-03-2010 17:24

Advertise Here


All times are GMT -7. The time now is 17:38.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.