Happy to be here!
I've read posts on here for years about folks wiring their fuse boxed with a dryer outlet to back feed the panel, followed by hordes of other posters telling them they need a transfer switch and it's uber dangerous to do it without one. I've been doing it without a transfer device for decades without issue. It's brick simple and only dangerous if you're an idiot. Maybe I'm super smart or there's alot of morons in the world, I don't know. For me it's the same with firearms. They are very safe as long as you don't point them at another person and then pull the trigger. Never had a problem. Yet folks inadvertently shoot themselves and others every year so what do I know. Anyhow, back feeding the panel may be legal in your area, and it's safe & effective if you have two brain cells to rub together. Land of the free and home of the brave....