It is fully warmed up to 40 degrees in less than one minute.
Step 1: Sewing
Each panel has 2 meters of carbon heated tape fron www.carbonheater.us and now on Amazon. Chose the maximum width of the tape to provide a very even heating. Size panels 34 x 42 cm, since it is better suited for the size of my clothing.
In each panels tape connected in parallel 2x1m and has an independent power button.. It takes about 3A under 12V (36W) for each one or 72W together.
Step 2: "Soldering"
You can sew wire to carbon tape to make a good and flexible connection. The contact place shouldn't be hotter than the tape itself. If not you must increase the contact area. Sewed contact very flexible.
Step 3: Connecting
Contacts may be sewed by sewing machine or just wraped with a wire.
But as you can see sewed contact is colder than the tape itself (left contact).
Wraped contact (on the right) is more hotter than tape.
Step 4: Using As a Modular System
On each panel sewn 4 pieces of Velcro . Now I can combine them into a single heated vest . A bit like a bulletproof vest:). It's very soft and thin.
Step 5: Using As a Modular System
Step 6: Using As a Heated Module
On the inner surface of conventional jackets I sewed 4 pieces of Velcro.
Now I can at any time fix the heating panel on a jacket and make it heated.