Masters doing a similar one $100 , lighter , cheaper and can add extra 2 year warranty for $40. No idea of longevity but for extra warranty on it may be well worth it.
http://www.masters.com.au/product/90...rter-i2000.jsp
Suitability Suitable for Powering: Television-800W, Computer-800W, Lights-900W, Pumps-400W, Refrigerators-400W, Washing Machine-300W, Hand/Stationary Tools- 500W, Heaters-900W, Frypan-900W, Toasters-900W
Both are only 900w continuous. I am not sure what the 240 v transformer on a engel draws ( how efficient it is ) but a 40 l fridge draws about 3 amps max on 12- 15v . ( 45 watts ) to pull temp down . Not sure what battery you are charging but 7amps is still a slow charge so long genny run time si if you can borrow a larger charger or if using 2 batteries a 2nd charger may save you extended run times. Again not sure if you can use the 5amp 12 output at the same time as the 240v plug on these little gennys.