New to 12v fridge

I’m just getting a handle on this 12v refer thing too. My previous was a 115v/ propane and the one before that was a 3 way 12/115/ propane. Both Dometic.   2way ran without issue for 22 yrs. The 3 way 14 yrs, again no issue. If the Norcold holds up 1/2 as long as my last Domestic, it may well live longer than me. Current 12v is Norcold 10 cu/ft. 
it draws 8.3 amps in day mode and 6.2 amps in night mode. Your owners manual should tell you what yours draws.  
Of course how many amp/hrs yours draws is rife with variables like ambient temperature, how often the refer door is open and closed , etc. 

safe travels.