05-10-2019, 05:57 AM
I haven't done routine load testing on air conditioner units but back in the day when I had roof airs, I found that if they were exercised regularly, it was not uncommon to get 15-20 years out of a roof air. On the other hand, I have had to replace one that was only about 6 years old.
You will throw a breaker if the 120 volt leg the AC unit is wired into exceeds about 50 amps. You should have 2 AC units on Leg 1 and the other 2 on Leg 2 so you likely have about 20 amps on each leg currently when all four are on. The ammeters on your coach are your friends. Your battery chargers, dishwasher, electric cooktop, microwave and electric dryer can add significant loads if they are in use. Additionally, the use of a hair dryer can take 12+ amps on whichever leg it is on.
You will throw a breaker if the 120 volt leg the AC unit is wired into exceeds about 50 amps. You should have 2 AC units on Leg 1 and the other 2 on Leg 2 so you likely have about 20 amps on each leg currently when all four are on. The ammeters on your coach are your friends. Your battery chargers, dishwasher, electric cooktop, microwave and electric dryer can add significant loads if they are in use. Additionally, the use of a hair dryer can take 12+ amps on whichever leg it is on.