Hi. I'm new to this. I have two 3000 Quattros tethered together. On a recent (first) RV trip I plugged in shore power and nothing...no 240V from the distribution box. I had lots of yellow lights flashing incl the inverter light. I suspect the batteries are flat and the shore power, being input 2, will not charge the batteries, only the input 1 which is from the bus alternator. Is this a fair guess? And if so, why didnt the 240V shore power 'go through' and energise the system? Do the inverters 'shut down' in this scenario so input 2 isnt passed through? That was more disappointing as I had no vehicle power whatever despite being plugged in.?