Is this even realistically possible?

[Robert P]

Thank you. I agree, the fridge manual says it uses 7 A. So my available 160 Ah would last about 20-24 hr. But the fridge doesn't run all the time and the solar panels will help. It would be useful to be able to keep the freezer cold overnight on a ferry for example. Even if I choose not to run the fridge on inverter mains, it should. Why doesn't it!!??

 

[funflair]

Thank you. I agree, the fridge manual says it uses 7 A. So my available 160 Ah would last about 20-24 hr. But the fridge doesn't run all the time and the solar panels will help. It would be useful to be able to keep the freezer cold overnight on a ferry for example. Even if I choose not to run the fridge on inverter mains, it should. Why doesn't it!!??

Should it though as DBK says? put it on AES (assuming you have that option) turn on the inverter and if it doesn't turn on to 240V you don't have that supply to the fridge.

 

[Lenny HB]

Thank you. I agree, the fridge manual says it uses 7 A. So my available 160 Ah would last about 20-24 hr. But the fridge doesn't run all the time and the solar panels will help. It would be useful to be able to keep the freezer cold overnight on a ferry for example. Even if I choose not to run the fridge on inverter mains, it should. Why doesn't it!!??

Your 7 amps is not right 3-way fridges take about 1 amp on mains but if running from an inverter and allowing for inverter inefficiency it would be about 23 amps at 12v.
You said it was a 3 way fridge why not just run on 12v, depending on the size of the fridge it will take between 10 and 15 amps.