This is interesting question, but I can say it is really specific. It will be better if you contact professional in this spher, because in general, the topic of electricity is complex and time consuming, and you need to know a lot and be able to successfully work with it. There are a lot of such information in the Internet, and you can use it. I would like to recommend you to read about such ac to dc regulated power supply https://www.aeps-group.com/pcategory/dc-dc-en/ . In my mind it can be useful for you, because they specializes in this sphere, and their tools can be useful for you
I only start to work in a sphere which is associated with work at low temperatures in the mountains. Can you tell me how to organize a robust electrical system?