ProPower auto shutdown after 30min when truck is off

[ytwytw]

I have fully FDRS upgraded (excluding BCM) 2023 with proper forscan config for APIM to enable ProPower after truck is off

Now I'm trying to power a electric garage heater that is 6000w from the 240v port

If truck is on, it's running happily for as long as I want
But when I enable keep ProPower on after truck is off, it only stay on for 30min

Any idea? Is the outdated BCM is the issue?
6000w should keep it running I'm sure it's not low power unless 240v doesn't count

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[Kansan]

Does the heater cycle, or heat continuously? There are a few threads that talk about the system needing to sense at least 90W every 5 minutes or it will shut down. If the thermostat stops calling for heat for more than 5 minutes, that would let ProPower shut down.

To keep it running, people are plugging in a repeat cycle timer and a 100W heater set to cycle on a few seconds every 5 minutes.