# Mega 2560 with Ethernet shield can not be Powered by POE **URL:** \ **Category:** General Guidance\ **Created:** [May 15, 2026, 6:41am UTC](https://forum.arduino.cc/t/mega-2560-with-ethernet-shield-can-not-be-powered-by-poe/1444189 "2026-05-15T06:41:39Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![ac95937](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/ac95937/32/1099112_2.png) [@ac95937](https://forum.arduino.cc/u/ac95937)\ **Post date:** [May 15, 2026, 6:41am UTC](https://forum.arduino.cc/t/mega-2560-with-ethernet-shield-can-not-be-powered-by-poe/1444189/1 "2026-05-15T06:41:39Z")
Hello, I have a project using an Arduino Mega 2560 together with an Ethernet Shield. > **[Ethernet Shield für Arduino Uno / Mega 2560 - kaufen bei BerryBase](https://www.berrybase.de/ethernet-shield-fuer-arduino-uno-mega-2560)** > > Das Ethernet Shield für Arduino Uno/Mega 2560 basiert auf dem ATmega328 und bietet erweiterte Netzwerkfunktionen durch eine RJ45 Ethernetverbindung, einen microSD-Kartenleser und Unterstützung für Power over Ethernet. Es eignet sich ideal f I know that the Ethernet Shield itself is not PoE-capable, so I also bought a PoE Splitter / Passive Injector: > **[PoE Injektor / Power Adapter, passiv, schwarz - kaufen bei BerryBase](https://www.berrybase.de/poe-injektor-power-adapter-passiv-schwarz)** > > Mit diesem POE Adapter Set kann in ein Netzwerkkabel Strom eingespeist werden um zum Beispiel eine Kamera, einen Router oder andere Geräte die eine Stromversorgung benötigen, zu speisen. Der Injector übernimmt die Stromeinspeisung in ein Ne However, when I connect the PoE cable, there are still no signs of life from the Arduino. Is there any setting that needs to be enabled, or is there something else I need to do to get this setup working? Thanks in advance for your help. ---
**Author:** ![UKHeliBob](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/ukhelibob/32/215663_2.png) [@UKHeliBob](https://forum.arduino.cc/u/UKHeliBob)\ **Post date:** [May 15, 2026, 6:44am UTC](https://forum.arduino.cc/t/mega-2560-with-ethernet-shield-can-not-be-powered-by-poe/1444189/2 "2026-05-15T06:44:10Z")
Welcome to the forum > [@ac95937](#): > > when I connect the PoE cable Exactly how are you connecting it and where are you connecting it ? What voltage is the POE cable outputting ? ---
**Author:** ![ac95937](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/ac95937/32/1099112_2.png) [@ac95937](https://forum.arduino.cc/u/ac95937)\ **Post date:** [May 15, 2026, 6:51am UTC](https://forum.arduino.cc/t/mega-2560-with-ethernet-shield-can-not-be-powered-by-poe/1444189/3 "2026-05-15T06:51:53Z")
I have an POE Injektor feeding the Patch Cable. The Patchcable is then connected to the POE Splitter which has one Cable connected to the Arduino and one to the Ethernet shield. It was about 0.07 v ---
**Author:** ![UKHeliBob](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/ukhelibob/32/215663_2.png) [@UKHeliBob](https://forum.arduino.cc/u/UKHeliBob)\ **Post date:** [May 15, 2026, 6:54am UTC](https://forum.arduino.cc/t/mega-2560-with-ethernet-shield-can-not-be-powered-by-poe/1444189/4 "2026-05-15T06:54:32Z")
> [@ac95937](#): > > one Cable connected to the Arduino > [@UKHeliBob](#): > > Exactly how are you connecting it and where are you connecting it > [@ac95937](#): > > It was about 0.07 v No matter how or where you connect it the Arduino is not going to work at that voltage. Do you mean 7V ? ---
**Author:** ![ac95937](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/ac95937/32/1099112_2.png) [@ac95937](https://forum.arduino.cc/u/ac95937)\ **Post date:** [May 15, 2026, 7:00am UTC](https://forum.arduino.cc/t/mega-2560-with-ethernet-shield-can-not-be-powered-by-poe/1444189/5 "2026-05-15T07:00:33Z")
No, it was 0.07. Could it be that the PoE injector was not delivering the required power? According to the instructions, if the PoE LED on the injector does not light up (which was the case) then the connected device is either not PoE-enabled or not compatible with the 802.3af/at standard. ---
**Author:** ![UKHeliBob](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/ukhelibob/32/215663_2.png) [@UKHeliBob](https://forum.arduino.cc/u/UKHeliBob)\ **Post date:** [May 15, 2026, 7:09am UTC](https://forum.arduino.cc/t/mega-2560-with-ethernet-shield-can-not-be-powered-by-poe/1444189/6 "2026-05-15T07:09:11Z")
The POE injector is certainly not delivering the required voltage. I know little or nothing about POE but a quick search reveals that the normal POE voltage could be as much as 50V which would damage the Arduino if fed directly to it Disconnect everything and measure the POE voltage > [@UKHeliBob](#): > > Exactly how are you connecting it and where are you connecting it ? ---
**Author:** ![ac95937](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/ac95937/32/1099112_2.png) [@ac95937](https://forum.arduino.cc/u/ac95937)\ **Post date:** [May 15, 2026, 7:23am UTC](https://forum.arduino.cc/t/mega-2560-with-ethernet-shield-can-not-be-powered-by-poe/1444189/7 "2026-05-15T07:23:53Z")
There are 3 Diffrent Types of POE There is POE with about 15 W POE+ with about 30W And POE++ with about 60W Yeah i will swap the POE Injektor and try again. ---
**Author:** ![UKHeliBob](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/ukhelibob/32/215663_2.png) [@UKHeliBob](https://forum.arduino.cc/u/UKHeliBob)\ **Post date:** [May 15, 2026, 7:26am UTC](https://forum.arduino.cc/t/mega-2560-with-ethernet-shield-can-not-be-powered-by-poe/1444189/8 "2026-05-15T07:26:27Z")
It is not the wattage that is the worry, it is the voltage I am sure that you are bored with me asking but > [@UKHeliBob](#): > > Exactly how are you connecting it and where are you connecting it ? ---
**Author:** ![ac95937](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/ac95937/32/1099112_2.png) [@ac95937](https://forum.arduino.cc/u/ac95937)\ **Post date:** [May 15, 2026, 7:42am UTC](https://forum.arduino.cc/t/mega-2560-with-ethernet-shield-can-not-be-powered-by-poe/1444189/9 "2026-05-15T07:42:30Z")
I have an POE Injektor feeding the Patch Cable. The Patchcable is then connected to the POE Splitter which has one Cable connected to the Arduino and one to the Ethernet shield. ---
**Author:** ![UKHeliBob](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/ukhelibob/32/215663_2.png) [@UKHeliBob](https://forum.arduino.cc/u/UKHeliBob)\ **Post date:** [May 15, 2026, 7:44am UTC](https://forum.arduino.cc/t/mega-2560-with-ethernet-shield-can-not-be-powered-by-poe/1444189/10 "2026-05-15T07:44:10Z")
> [@ac95937](#): > > connected to the Arduino ONE LAST TIME > [@UKHeliBob](#): > > Exactly how are you connecting it and where are you connecting it ? ---
**Author:** ![ac95937](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/ac95937/32/1099112_2.png) [@ac95937](https://forum.arduino.cc/u/ac95937)\ **Post date:** [May 15, 2026, 8:04am UTC](https://forum.arduino.cc/t/mega-2560-with-ethernet-shield-can-not-be-powered-by-poe/1444189/11 "2026-05-15T08:04:23Z")
To the POE Splitter ---
**Author:** ![UKHeliBob](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/ukhelibob/32/215663_2.png) [@UKHeliBob](https://forum.arduino.cc/u/UKHeliBob)\ **Post date:** [May 15, 2026, 8:43am UTC](https://forum.arduino.cc/t/mega-2560-with-ethernet-shield-can-not-be-powered-by-poe/1444189/12 "2026-05-15T08:43:31Z")
I give up ---
**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\ **Post date:** [November 11, 2026, 8:43am UTC](https://forum.arduino.cc/t/mega-2560-with-ethernet-shield-can-not-be-powered-by-poe/1444189/13 "2026-11-11T08:43:39Z")
Closed on November 11, 2026, 8:43am UTC This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.