Can't run heater and use inverter at the same time

[Soton Campers]

This is on a 2021 T6.1 Ocean.

I've not used the Cali for a while as a mobile office so thought I would today.

Plugged the laptop into the inverter and all was good. A little later I put the heater on. Shortly after, I noticed that the laptop had stopped charging. Sure enough the pattern is if the heater is on, it won't charge the laptop via the inverter.

As soon as the heater stops, charging resumes from the inverter.

The total draw, if I can believe the display, is 6 amps. The voltage is showing 12.1. I'm starting to think only one leisure battery is working.

Anyone else had this issue?

 

[dspuk]

Sounds like behaviour by design to me to protect the batteries when your drawing a lot of amps from the invertor but then needing to use the heater. There seems a lot of behind the scenes logic going on that is not overly advertised or documented but in hindsight makes sense from a protection POV.

 

[yossarian]

I think 12.1V is close to the 'floor' voltage where load shedding of some equipment occurs.

 

[R_Sargeant_CH]

The inverter is limited to 300w. How much power does your (electric?) heater draw?