Can the FPV4 power board be configured to output 12V in the X1100 Four Door Controller and Power Kit (ADC-AC-X1100-4PSE) instead of 24V?
No. The ADC-AC-X1100-4PSE kit is designed to provide both 12VDC and 24VDC to the F8 distribution module. Changing the output voltage of the FPV4 to 12V will result in the B100 and subsequently the F8 distribution module only receiving and being able to provide 12VDC or lower.