Heated Coat

As I write this, winter is coming. It’s getting cold. Although we haven’t had a real snow-storm yet, there’s ice on the lakes.

I do NOT have a heated work-space for working on projects all winter, my electric car has an OK, but not great, heating system, and I’m really not looking forward to shoveling snow.

That is, unless I was a bit warmer.

A while back, I picked up a heated massaging seat cover from the thrift store for five dollars. These are the sort of thing that you put over a chair, and it gives you a nice back massage, including heat. I noticed that they all actually ran on 12V DC power, so they would be easy to modify and run in, say, a car! I started off by using it as a heated seat cover in my electric Geo Metro. It didn’t take long though to realize that while a back massage while driving down the road is rather nice, after sitting on it for ten minutes or so, the massage motors just become lumpy and uncomfortable!

My wife’s car also has a heated seat, but only the driver’s seat, not the passenger. By using the heating element out of the seat cover, and sewing it into my coat, I would have heat on the go, no matter which car I was in, or even just working outside!

I got to it by first removing the heating element from the seat cover. That meant unzipping the back, and peeling away foam to locate and remove the heating element. I also saved the DC power barrel connector and the AC to DC wall power adapter that came with it.

Next, it was a matter of deciding where in the coat I wanted the heater to go. I laid out my coat and put the heater in about the middle of the back, and made sure I would have enough wire to have the power plug come out the hem of the coat. I put pins into the coat on the corners of where the heater would go to mark the location. Next, I soldered the heating element wires to the power plug and shrink-wrapped them.

Then I cut a few inch long hole in the right-hand hem of the coat. I pushed the heater through, and up into it’s position between the lining and shell of the coat up to where I marked with the pins. I ran a few stitches through each of the four corners of the heater with a heavy-duty needle and thread. These stitched went through the lining, into the heater, and back out into the lining again. There aren’t any stitches showing through the back exterior of the coat.

Where the power plug came out the bottom of the coat, I did a heavy whip-stitch around the wire to pin it down, and then sewed the lining back up.

Now, all I have to do is plug in that short cord sticking out of my coat into any 12V power source. That could be the original 12V “wall-wort” power adapter, but it could also be a car cigarette-lighter power cord, or even a 12V rechargeable tool battery! I already had a Craftsman 12V Lithium battery for a cordless drill. It’s small and light enough to fit right in a pocket. I cut a piece of power cord off an old power adapter which had the right size connector to plug into the coat. I stripped the two wires and crimped on a pair of 1/4″ male spade connectors. Those go directly into the 12V battery, and the barrel connector end runs to the coat. Now, I have a PORTABLE energy source for the heated coat. Great for doing things like shoveling snow off the driveway! To recharge the battery, I pull out the two space connectors, and put the battery in its regular charger.

Total out of pocket costs for the project are just over five bucks – what I spent for the seat cover at the thrift store. I already had the coat and some assorted bits of wire, needle and thread, and crimp-on spade connectors and battery.

I’ve seen similar heated coats new in the store for $200. They look nice, but mine works just as well for five dollars and a little bit of DIY!

Stay warm, I know I will!


{ 2 trackbacks }

Heated Coat!
November 30, 2012 at 1:32 pm
DIY Heated Coat | PowVid
December 5, 2012 at 3:48 pm

{ 11 comments… read them below or add one }

1 barbnelson November 30, 2012 at 4:07 pm

You’re a genius, Ben!

2 Andrew Parry March 27, 2013 at 3:11 pm

Excellent. I am looking at doing the same thing. I notice you can get two- piece heated car seat covers – back part and seat part. I am thinking of simply wearing this as a tabard under my motorcycle jacket.

3 admin March 27, 2013 at 8:51 pm

Try it out and let us know how it goes!

4 astral mage instrucbles October 3, 2013 at 9:43 am

heres another idea. put it in a separate set up with hook an loop fasteners so u can wash the coat with out destroying the heating element.

5 Dave September 15, 2014 at 4:47 am

Just saw you present at Mother Earth, and am loving all your projects. I’m a new mailman facing my first winter on the job. This may be exactly what gets me through the winter and makes me the envy of my coworkers. About how long does the charge last?

6 ralph November 23, 2014 at 7:00 pm

Hello Ben,
I picked up a heated massage for my chair indoors. It only will plug into a wall outlet. I am wondering if I can use it with a battery pack (outdoors) like you did and if it would be cost effective? Please email me as I really would like to hear from you and get a more detailed schematic on that battery pack connections …I WILL build one but want to do it right the first time and learn from the expert (: Please reply.

7 Jim February 27, 2015 at 11:19 am

can it be modify to run it off from a portable battery bank that 5v instead of 12v.

8 admin February 27, 2015 at 2:07 pm

I don’t think you would need to modify it at all, it would just not make as much heat at 5V as at 12. I suppose that if you already had a 5V battery (such as people are using to charge phones, etc.) but NOT a 12V battery, it might be an acceptable answer.

9 admin February 27, 2015 at 2:08 pm

If it’s really cold out, I’m not usually staying out for more than an hour or so, and it lasts the whole time.

10 admin February 27, 2015 at 2:13 pm

Hi Ralph,

If the power really is just a standard wall connection straight to the massage cover, it’s AC only and will NOT work on batteries. However, I haven’t seen any that style yet. All of the ones that I have seen use a “wall wort” or an adapter that converts AC power to DC power. On that power adapter, it will say the voltage, which is nearly always 12V DC, so that you can use it in your car as well. The wiring is extremely easy. If you remove the heating element from the heated cover, just connect a wire from either end of the heating element to the + and – of the battery. Put a 5 amp fuse and maybe an on/off switch on the positive end as well.

11 TinMan July 13, 2017 at 7:41 am

Hi Ben. I am about to crack on with ur coat project. Do u have any updates? What sort of battery source would u use now? What is the lowest voltage would be required to heat. I am going to wrap mine inside some survival foil too and glue velcro to the foil so i can detatch it from the coat to wash it. I am looking to buy my own battery cells like out of drill and make my own banks so am getting ur opinion. My FLT Engineer is putting me a secret 12v feed under my seat so want some quick release connectors too. Any ideas

Leave a Comment

You can use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>