[morls (Stephen)]

I've installed my pier, but have now run into some power issues. When slewing on both axis simultaneously the voltage drops below 10V, which is causing the hand controller to malfunction.

The power supply I'm using is a Powertech DC Regulated Power Supply, supplying 13.8VDC at up to 12A. I think the problem might be that the cable from power supply output to mount input is somewhere around 12 metres long, and is in 3 sections spliced/soldered together through a conduit. Without a load, the voltage at PS terminals is 13.9, and is the same at the mount connection.

Would it make sense to assume this long cable run is causing a voltage drop under load?
The reason I have the PS in the garage is that it has a fan, which is very noisy. Has anyone disconnected this fan? Would the PS overheat without it? Photo of PS is attached.
Cheers
Stephen