i agree with Stryker777, solar energy would be a better option. u can buy it directly from hyperlink (http://www.hyperlinktech
i have an experience to share with users, i have one tower set up like this :
for power, we have only 3 hours a day from a local villager generator so i use 2 75ah batteries (serial) to make it 24volt and we use a inverter to make the output become 18 before going into rb. no adaptor is needed,just plug the dc cable to poe injector. it works for months.
don't use ac power as it consumes more power that u can imagine if you are running on remote site. use dc directly.
for your data : rb running on 75ah fully charged batteries could last for 2-3days. before it keeps restarting due to low power input