Best way to deliver power to an Internet tower

[german77]

Hi, I need help determining what kind of installation for a Internet tower would be the best. Let me explain how everything it's connected.
The height of the tower it's 30 meters, most devices work from 20V to 30V others from 30V to 60V. The average power consumption it's 378w.

Actual installation: I have two 350w 28.5v PSU connected in parallel one has a 0.05 ohm resistor in the positive terminal with a little higher voltage to ensure that power it's distributed equally. After that it's connected to a 20A solar controller that charges a battery and lowers the voltage to 27V. Then its connected to an AC power bar. This it's located in a cooled room close to the tower. The DC voltage is delivered with 14AWG cable to the devices in the tower. Then each device that work at 50v has it's own step up converter. The tower consumes about 14A and only 23.7V reaches the device. There is 3.3v voltage drop which is unacceptable specially when power goes out because the batteries deliver 24.8v and only 20v arrives to the devices which is to low.

Suggested solution: Use a 600w 32v PSU go to the solar charger then put two AC power bars at 24v and a third one with 50v that has an step up converter of 500w. Then deliver each device with the correct voltage with a 10AWG cable.

Sounds overkill, but the voltage drop should be less than 0.8v, a single PSU for each voltage should work better and reduce the current in the cable by a half.

Solution 2: Deliver 50v to the tower then step down for 24v devices. Problems: Most solar controllers work up to 24 batteries. Not really solving the problem. Making everything more complicated and a new source of problems, specially if the step down fails and delivers 50v to a 24v device.


Not a solution: Use a no-break. Put a box in the middle of the tower with a PSU with 24v and other with 50v then deliver to the devices. Problems: Signal noise in the AC supply and Ethernet cables via induction. Overheating in the box, they usually go over 60°C not good for a PSU. And difficult maintenance.

[mikeselectricstuff]

Solution 2: Deliver 50v to the tower then step down for 24v devices. Problems: Most solar controllers work up to 24 batteries. Not really solving the problem. Making everything more complicated and a new source of problems, specially if the step down fails and delivers 50v to a 24v device.

48V is a common DC standard so things like DC-DC converters are readily available ( decent ones that won't fail to 48V out) .
You might also consider distributing as mains voltage (110 or 220), as all the conversion you'll need is available easily off the shelf, and you'll save on cable.,