I have an Altronix AL600ULX power supply which will output 24VDC and is rated for a maximum of 6A. I want to have this power supply activate a locking mechanism which is located several hundred feet away. I have already purchased 18AWG cable to connect the locking mechanism to the power supply. I am trying to determine the allowable distance between the lock and power supply before the lock will simply not activate. The documentation on the lock indicates that it is rated for 24VDC +/- 10%, so I'm assuming my lock will still operate at 21.6VDC. The lock draws 0.3A at 24VDC when engaged, but it has an in-rush current of 1.3A. I'm not sure whether I should use the in-rush current or the continuous duty current rating to calculate my line loss. I'm thinking I need to use the in-rush current for my calculation - the logic being that if my cable run is too long, the voltage will not be high enough on the lock side to give it that initial kick to activate the solenoid. The in-rush is only a fraction of a second, though, so I'm wondering if there's something special to the circumstances of the in-rush situation that would make it not apply to the line loss calculation. Maybe it's just wishful thinking, because I'd really like it if the cable and device locations that I've picked out would work :-) Thanks for any insight you can offer!