Usually the ACG+ has a power supply recommended at 24V DC.
However the unit can take anything from 12V minimum up to possibly 29VDC. The maximum has not been tested as believed would blow a fuse or a resistor from anything over 25VDC but the minimum was tested.
Each sensor works on minimum voltage of 5 up to 26VDc apart from the dewpoint which works on 11-36VDC but the limitations are on how much power is needed to power the screen (12VDC) and how much power would it take to blow a resistor on the intake (unknown).
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