I bought the F3800 plus 1 expansion battery and 2 400 watt solar panels. Yes, it's very heavy.  Yes, you can plug it into a generator plug. I have one for my gas generator with a transfer switch. On the downside, my limited experience charging with the solar panels is very slow.  Even in the direct South Florida sun I was only able to generate a maximum 500 watts using both panels, and the slightest cloud interference caused an immediate drop, often down as low as 75 watts total. So, I figure I'll need to use my gas generator along with solar to recharge when I have a power outage. Having said that, I expect it will help during outages and reduce my need for gasoline.  My concern and reason for purchasing is post hurricane needs.

Man, that thing is huge. It's like a fridge (or at least that's what it looks like on my screen).

Thanks for the review, Notebookcheck.

That is really neat.  Is there some sort of current(heh) or upcoming standard where devices such as these can be plugged directly into a home's power system and supply backup power?  i.e. so you don't have to plug in cord directly into this device, and it supplies a limited backup feature...