I'm about the same when it comes to electrickery Steffo, I figure that the fridge could pull 5 amps all day if it needed and I wanted to stay put for three or so days, if the panel was putting in 8 amps and the battery would be at near full charge going into the night.
The spare 800 CCA battery powers our fridge for approx 30 hrs without being charged, So I just went with the O'l big is good, But bigger and more is better, way of thinking .. Going to ad a dedicated small freezer at some time too, But would get another 150W panel / bigger battery etc to ad .
https://www.youtube.com/watch?v=J1ho8di4ywQ 
The blanket will only put out max power in bright cool conditions, your not going to get 8A from sunrise to sunset, say you get 60Ah, if your fridge draws 6A and runs 50% duty cycle that's 72Ah a day your using.
If the weather is hot and your running it as a freezer your consumption is going to be a lot higher, you really need two of the blankets to keep afloat and in cloudy conditions you will still have problems.
It will vary though on your setup and how you use it.
Example, my waeco 40Ltr running as a freezer with a 100W blanket, blanket just covers the load if you have nice cool sunny days.
Waecoe 80Ltr fridge freezer in van, 230W just covers usage on good days.
I would keep an eye on the regulators voltage, unless they have improved them the voltage used to climb alarmingly
high over time.
