Direct 24v DC power (up to 30v, will run down to 10v) can be provided to pins 4/5 & 7/8.
This will power all epmp SMs and the e1k, e2k and e3kL APs. Follow the polarity on the included PSU to ensure you dont have issues with an early model radio that doesnt support agnostic polarity.
If you have a power supply from an old Canopy radio, then cut the brick off and place positive on the wire with the white stripe and connect as per the label. This power injector also can be used to power the e3k AP if given more than 37v and less than 58v, same polarity. I use this and a variable buck/boost converter to set the voltage based on what is to be connected and power off a 7ah SLA.
For customer side power issues, we get them to buy a certified UPS with as large of VA rating as their budget allows, this will keep the radio and the wifi running for a long time and you wont run into legal issues
Warning: you do this at your own risk and I will not be held liable for any damages that result from the following. It is up to you to either have the skills or have someone with the skills and the regulatory body of your area for any device you provide or sell to a client.
If you want to build an option, get a 24v dc 350w power supply, a 1n4001 diode, a fuse holder with 10a fuse a passive power injector that only puts power on pins 4/5 & 7/8, and two 12v SLA batteries at least 7ah but you can go as big as 20ah with increased recovery period. Set power supply no load voltage to 28.6, connect the diode to the positive output of the power supply, and test that you still have voltage, if not reverse the diode. Connect the fuse holder to the battery positive and to the diode, not the power supply (this is very important), connect the battery negative to the power supply negative, wire the batteries in series to get 24v. Connect your passive power injector to the diode/fuse connection and the battery negative so that you get the correct polarity at pins 4/5 & 7/8. Use the included Cambium PSU label to reference.
If you place this inside a nice enclosure then remember to lable the powered port as “To Radio” to ensure accidents dont happen.
A 7ah battery at 24v will last over 14hrs but takes close to 30 to fully recharge. A 20ah battery will last over 30hrs but requires more than 48hrs to recharge fully. Expected battery life is 300 to 400 cycles, less if the battery is allowed to run completely dead.
If you need to provide another voltage (say 12v or 9v) for wifi router power, then use a buck converter to supply the stabilized voltage from 24v, do not tap off one battery or you will have troubles. Remember to add fuses for each output, the f180/f200/f300 radios need 2A max, most routers need 1 to 1.5A. Automotive fuses on 24v and less is acceptable and preferred as they are designed to operate at these voltages and will open near the correct ratings.
This is essentially what we power our towers like with some key differences such as use of Packetflux’s sync injectors and much larger power supplies and batteries (we use 500ah flooded for most applications with a couple lithium setups in long term testing). We also have the qualified people to design, build and care for these systems. We also have insurance to cover our built to purpose systems under our direct control and operation. So I encourage you to convince your customers to use readily available UPS’s with at least 1500VA or more. Considering the expected loads this will give plenty of operating time. If they need more than a few hours, then they should be using a backup generator and the UPS would be a carryover device to give the generator time to start and supply power. For these kinds of needs, work with a couple electrical contractors to provide these value added services and let the customer decide.