Please see this post for additional details: http://community.cambiumnetworks.com/t5/PTP-FAQ/PTP-650-Compatibilty-with-802-3at-standard-PoE/m-p/50740/highlight/true#M90
In addition, here is some information on solar setups: http://community.cambiumnetworks.com/t5/Sub-6-GHz/Power-Supply-ptp-650-with-energy-from-the-power-grid-and-solar/m-p/55516#M300