From the RB532r5 user guide
http://www.routerboard.com/pdf/rb500r5ugQ.pdf
… JP3 and JP4 choose input voltage (1-2 for 25..60V DC, 2-3 for 6..22V DC). Note that because of wire resistance, PoE requires higher voltage (it is recommended to use 11V minimum). The low voltage mode has overvoltage protection circuit, so you will not damage the board if jumpers are set incorrectly, but the power is within 6..60 V DC range…
I have a situation where we want to power a site via batteries/solar. The other device at site requires 24VDC so, it seemed logical to create one 24VDC battery supply (with solar recharge) to power the site.
As common as 24VDC is as a supply voltage, 24VDC is not implicitly within either of the two input voltage jumper setting rages of the RB532r5.
But, then there is the sentence which says:
… The low voltage mode has overvoltage protection circuit, so you will not damage the board if jumpers are set incorrectly, but the power is within 6..60 V DC range…
This certainly seems to say that the 6-22V jumper setting will accept up to 60VDC. Which begs the question: How does the RB532r5 handle that overvoltage situation? Does it regulate the source down to something usable (but then why have the 48v jumper setting?!?) Or, does the RB532r5 power supply shut down in an overvoltage condition?
Bottom line: is it acceptable/advisable to power an RB532r5 at 24VDC with either of the two jumper settings?