Amps in was useful when I only had a 20 extension cord this week when we had to move from floods in east texas. I now know coffee pot used 12, microwave 18, aquhot accidently left on 110 is 19 until shut off. Charging system only about 3. Sure like the all led lighting We did power management and lasted 48 hours on 20 amp breaker and did not blow it.
Never noticed when the res refer was on but it made ice so life was goodder.
It does tell me amp input when on 50 amps and with tvs computers sat and lights it is at 1 amp in right now