Hopefully not too dumb a question, but I am in the process of getting an Eco Flow Delta Pro w/extra battery. I already have a Bluetti and Inergy Kodiak that I use in emergency outages and when camping. I'm planning to use the Delta Pro and battery upstairs where I have better access to my solar panels. My daughter lives downstairs and will be using the Bluetti in a power outage. My question is - are you able to plug a Bluetti into a Delta Pro to charge it? It seems like you could, but I don't want to mess anything up. Secondary question- what about using an extension cord with the Bluetti ac cable? I just am really green w/this stuff. Thanks for any help you can give me.