Try PVCase for free here: https://pvcase.com/GreatScott

You can get the most important shown components here: (affiliate links)
All the heating pads I tried: https://s.click.aliexpress.com/e/_DkM... https://s.click.aliexpress.com/e/_DDx... https://s.click.aliexpress.com/e/_DlV... https://s.click.aliexpress.com/e/_DDJ...
Temperature Controller: https://s.click.aliexpress.com/e/_DDo...
You can get the rest of the components in your local hardware store.

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In this project I will have to solve a winter problem for the batteries of my PV system. The problem is that those can get only charged up over 5C and in my case they are placed inside a concrete garage that will get colder than that. So I will try to build a very well thermal insulated chamber that I can heat up electrically. I want to keep it save, low power and easy to use. Let's see how it turns out ;-)

Thanks to PVCase for sponsoring this video.

0:00 My Winter Problem
1:23 Intro
2:10 How to Create Heat?
4:41 Building the Chamber
8:10 The Control Electronics
8:56 Final Tests & Verdict