I don't know how much the fridge draws but I use my fridge on electric when I am hooked up, and also run either the kettle, toaster, sandwich toaster or 2KW fan heater. (
NONE of these are run at the
same time normally, I think the kettle and toaster was put on together once by mistake and the trip still didn't go) We also have various lights daughters DS and mobile phone charging.
Generally You are usually quite safe as long as you keep everything below 2KW I think
Here is a quick guide I found online
I found this at
http://gasrefrigeration.net/dom_techdata/MAN_SM.PDF
Which also describes how the fridges work really clearly