I am installing two EAP245's and an EAP225-Outdoor in our community hall to replace the router WiFi and and an old Netgear 802.11.g Access Point. 

The existing Netgear Wifi Access point is powered by POE supplied by a Netgear GS516TP:16-port 1000Base-TGigabitPoE Smart Managed Switch which has 8 PoE802.3af ports with a total POE budget of 76w and capable of 15w per port up to 22w?? per port.

I would prefer to connect all APs on an eathernet backbone but because there is no mains power immediately adjacent where one of the EAP245's will be postioned, if possible, I wanted to connect the EAP225 Outdoor to the second EAP 245 ethernet port. However unless I am mistaken the second ethernet port on the EAP245 does not pass through POE?

I could rig up a POE injector taking power from the incoming ethernet cable and injecting it into the outgoing ethernet cable connected to the second port but not sure if applying POE to the second port would damage the EAP245. Also the EAP245 has a load of 12.3W and the EAP225 a load of 10.5W this is marginally over the 22w POE load supplied by the Netgear switch port and I would be worried it might damage the switch.

My questions are:-

1) The load figures above for the two TP-Link EAPs are taken from the TP-Link Specification sheet for each AP. Are they the minimum figures when idle or do they increase when devices are connected by WI-FI and transmitting/receiving data?

2) An alterntive option to daisy-chaining each AP on the Netgear port is to try and provide separate POE power to the EAP225 via an injector. Will it damage the second ethernet port on the EAP245 which I will still need for a data connection as there is no hub nearby.

3) The final option is to have a part ethernet part WI-FI backbone with the EAP225 linked by WI-FI backbone to the EAP245. Is it possible to have have part ethernet part wifi backbone on the same network and is there a performance degredation for the EAP225 data throughput by being linked by WI-FI.  The EAP 225 is providing wifi access in the garden so will not have the same amount of connections as the EAP245 although it hopefully will alow roaming between the two APs.

I have attached an image showing the three connection scenarios. I would appreciate any pros and cons of each connection scenario or indeed if they are feasible.