9W (Powerbox Pro)
8W (LHG5XL AC)
Total = 9+8+8+13 = 38W
If your PSU supplies 24V, it will be 38/24= 1.5A flowing through 50 meters of wire (does not matter if Cat or DC)
to achieve less than 10V loss on such wire, you would need 10/1.5 = 6 Ohm or less over 2*50 meters (you must count both ways as the voltage loss happens on both branches of circuit). That is max 18 Ohm per 1000ft or 60 Ohm per 1000m.
Also, keep in mind this calculation is for perfect PSU which will give 24V all the time. Real PSU will decrease voltage when you increase current due to internal resistance so your devices might actually draw even more amps...
So, do not blindly install cat6 cable because cat6 does not guarantee low resistance. You need to find cable which will fit your requirements with low resistance.
With that in mind, you will find that you got not much choice - If I remember correctly typical Cat6 cable is 23AWG or more which has around 20 Ohms per 1000 feet (if it is pure copper, cheaper copper/aluminium versions would be around 30 Ohm per 1000 feets).
As you suggested, running from DC jack would be an option because it is easy to get normal DC wire with 20AWG or less.
Another option might be:
- running separate cable with full AC voltage and put your PSU up on tower.
- running 48V passive/af/at or to the tower and convert it down to 24V but that will cause another loss of power...
not sure if there are other options
Thats not the real usage Power draws.....
Powerbox takes 2,5-3,5W
LHG (both Models) about 3-4W, Mantbox the same (with SFP in use more)
But the Problem is the Bad cable, we often use 40-50m for passive POE, but not with low cost cables.......