power supply

Anyone have any experience of the Jackery Power Supplies, reason I see they are on discount today in the UK. https://uk.jackery.com/pages/black-friday?utm_source=google&gad=1&gclid=Cj0KCQiAjMKqBhCgARIsAPDgWlyQuA_QOKfwevuefhM3AWe01y3VWHhgpCfJc6C3qqnFBYNZla1hSB8aAjEoEALw_wcB

Since I am a complete failure when it comes to electricity and wiring and my attempts to answer my questions myself keep turning in circles, I wanted to tap into the incredible wisdom of this forum and ask for help with my plans to make the car fit to serve as an outdoor office from time to...