Hi, i need to put my device in remote place where there are no power, so i need to put my device on batteries (serial 2x12v = 24v).
I read on the manuals :
IEEE802.3af Power over Ethernet: 12V or 48V DC (except power over datalines) Power jack: 11..60V DC
I am going to use POE for my device, can i use 24v as the input? because it stated 12v “or” 48v. Thank you,
This will work , i have several running on battery and solar panel for 12 and 24Vs powering option
Okechukwu
accecptable input ranges (from memory, may be off 1 or 2v on the high numbers…
532 - 12-24v or 40-54v (depending on jumper)
512 - 12-24v
112 - 12-54v
I would not put more than 22 volts into an RB500 on the low power setting, as it will fry the board (in my experience). 
I have never tried the high power setting with less than 48V.
I’m running two 500’s on a remote battery/solar set-up.
There are two 125 a/hr deep-cycle batteries charged from a 160w solar array and so far the batteries have been keep pretty much at full-charge through one winter.
Currently (!) the batteries are hooked up in parallel, delivering around 13 volts but with a notional 250 A/hr but we have the option of hooking them in series delivering 26v to the boards rather than the 13v they get now, and the consensus of these boards seems to be that 12 -13v is low for the 500 which has to up the amps to compensate.
However the 500 set-up guide gives the JP3/JP4 positions as 1-2 for 25-56v and 2-3 for 6 - 24v. With the batteries in series a prolonged run of sunless weather could take the batteries down to 24v or even less, which is the cusp of the jumper positions. Set the jumpers to 25-56v and you risk underrunning the minimum supply but set them to 6 -24v and you’re going to be a couple of volts over most of the time.
Catch 22.