Btw voltage from power module when copter is in standby jumps from 11.38-11.46V Is this normal? Is it possible that it gets some interferenfe from wiring (especially during lower battery voltage) between power module and pixhawk?
Some simmilar problem with power moduel here:
http://discuss.ardupilot.org/t/incorrect-voltage-readings-from-power-module-and-or-pixhawk/8796/4