Take a look at the source code:
Line 23 in PowerFSM.cpp seems to tell that the PowerSavingMode is always ON if the node is a Router.
The firmware writers assume that a solar power source has (always) low power. But if so, the operator could manually enable the power saving mode. If you have a 100 W module and a 50 Ah battery, then you don’t need this. But Router + PowerSavingMode=false seems to be impossible without modifying the firmware…
I’m going to open an issue on github, although i expect that it will be deleted after some minutes…
Issue submitted: [Bug]: Router without power saving mode · Issue #2203 · meshtastic/firmware · GitHub