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/_DkMfIoR https://s.click.aliexpress.com/e/_DDxbBbh https://s.click.aliexpress.com/e/_DlVTkZZ https://s.click.aliexpress.com/e/_DDJsxkx Temperature Controller: https://s.click.aliexpress.com/e/_DDodCTl You can get the rest of the components in your local hardware store. Previous video: https://www.youtube.com/watch?v=TpnBQ9bW4K8 Facebook: https://www.facebook.com/greatscottlab Twitter: https://twitter.com/GreatScottLab Instagram: https://www.instagram.com/great.scott.lab/ TikTok: https://www.tiktok.com/@greatscottlab Discord: https://discord.gg/zuAvkAuhsY Support me for more videos: https://www.patreon.com/GreatScott?ty=h 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