Hopefully this will inspire someone to come up with a PoE-Out solution..
thanks for the post
I think you need kama 
Actually I successfully modded an OmniTik to PoE-Out on ports 2 to 5.
It is notable, that the PCB already is prepared for PoE-out, so all you need to do is to short-circuit some contacts with wires.
Unfortunately I cannot do photos of the mod, because the OmniTik is being used on a tower 
Anyhow, I took one of the images above and painted how I did the wiring.
Please note that this is a very simple PoE-Out hack.
Any overload will cause a shutdown of all connected devices including the Omnitik itself.
Thanks sup5. Looks simple enough. Actually I only need 1 or 2 PoE outs.
One question, are you bridging pins 4 & 5 together by soldering the wire across the two pins?
I really don’t remember anymore, whether I shorted/bridged pins 4 & 5. It depends on the PCB.
Just take a Multimeter to test whether the PCB already has pins 4 & 5 shorted.
If this is the case you don’t need to short pins 4 & 5.
Anyways it won’t hurt to short circuit pins 4 & 5 .
BTW.: This mod also applies to the RB750
I’ve just tried bridging Eth1 pin 4&5 to Eth2 pin 4&5 and you’re right, it does power the device. I powered an RB333 plugged into Ether2.
However I noticed that it only links at 10Mbps. It tries to negotiate up to 100 but by the time the 333 boots it is linked at 10Mbps FD. Other than that it works fine.
Are you seeing this too?
I don’t experience this issue at all.
Hi andreacoppini!
Do you mean that you power two RouterBoard using one single Power Supplier?
what is the Voltage and the AH?
Regards
it is possible, just have to have PSU capable enough to run feed all the boards connected.
Hi janisk!
Please explain is more
PSU=Power supply unit?
How many volt & Ah please for two RB711 for Example
Regards
Yes, I only used 1 PSU + 1 PoE injector to the OmniTik. I did this test using the normal power supply and PoE injector included with the OmniTik. I made sure all wireless interfaces were disabled to minimise the load.
As janisk mentioned, you would need a bigger PSU (more Amps, same voltage) to run more devices.
Obviously, doing this voids your warranty.
thank you very much
Should I try That!
but not now xD
Could this work on a 250GS?
Sure!
it most work for All Router Boards
I wouldn’t try this mod on a gigabit capable device.
This mod will destroy the gigabit capability of your routerboard.
Reading the power ratings of the PSU, which was shipped with the omnitik:
24V 0.8 A = 19.2 Watts
This means the PSU of the Omnitik should be able to drive a Omnitik and two RB-SXTs or two RB711 without any hassle!
Hi sup5
My Omnitik was shipped which
24V 0.38 A
Hope it can carry Omnitik and one RB711?
Regards
RB711 with 1 or 2 chains?
without wifi, about 2 - 3W
2 chains
MAX around 7W if not mistaken
that is, both chains, 6MBps data rate = highest power usage.