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Assuming your 2022 Axis is wired like my 2021 Axis:
The radio is powered from the house batteries through the on/off switch which goes to the converter located in the entry way. Turn off that switch while in storage and the radio will turn off as well as most other parasitic loads. The solar panel will continue to charge the house batteries because the panels are wired directly to the batteries, ie they bypass the switch. The chassis battery will be charged by the Precision Circuits BIM 160 (not a BIRD) from the excess current from the solar panels.
With the battery switch on and everything else off, the draw on the house batteries is about 0.7 amps. That includes 0.2 amps for the Girard water heater (which can be turned off with the outside switch). The remainder of 0.5 amps is the BMPro, the radio, the Winegard and ???? The radio draw which is a few tenths can be turned off with its on/off switch.
If you turn the house battery switch off, the parasitic draw drops by a factor of ten and your solar panels should easily keep up with that. So always store with the switch off.
So...., with that background: 0.7 amps for 24 hours is 17 amp hours. Your solar panels will put out that much on a sunny day, but on average with cloudy days, probably not. That would lead to your house batteries slowly dying.
Why did your chassis battery die? It should have been protected from discharging with the house load by the BIM 160. I don't think this is the cause, but maybe- Thor often wires the BIM 160 incorrectly and you may need to swap the heavy cables.
You can determine which cable is which on the BIM 160 (which is inside the engine room just in front of the driver's side wheel well) by disconnecting the house battery ground so that nothing is connected to it and then with a meter check to see which wire on the two big terminals is still hot. Then the hot one is the chassis battery and should be connected to the chassis battery terminal on the BIM 160. Like I said Thor often connects them incorrectly, but it is easy to connect them where they need to be.
See the attached which shows the correct connections. The chassis battery should be attached to the Battery A terminal and the house battery should be attached to the Battery B terminal as shown in the diagram at the bottom of the attachment.
David
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