SOmewhere it says wht the throttles draw maximum (with the backlight on max brightness, etc). If you run a single power supply bus for the panels, and used something liek a 2.5-3 amp power supply it should be plenty. But if you do use a large power supply, put a fuse at each tap to the plug for the panel (the 2.1mm jacks), you don’t want a short (such as the little pins in the socket getting bent on top of one another) putting 3 amps through one fo the panels, it will fry the panel. ANd since any given panel support 2 throttles, there’s never any need for current in the amp range to be supplied. Also, the UT4 throttles draw a lot less than the DT40x models, no LCD with backlight (the backlight is the power hog).
I know somewhere there is a wiring diagram on how to do this right (ie, not the way sugested by DIgitrax in the UP5 instruction sheet). But really, it is a 2 wire DC power bus with taps to 2.1mm connectors that match up with the power socket on the side of the UP5. Polarity matters, I THINK the outside barrel is - but don’t quote me on that - if you have a handy one of the PS14 power supplies that Digitrax sells, check the output with the meter in volts mode. If I had a UP5 in front of me I could tell you but I’m a long way from home, in Bossier City, LA.
–Randy