I’ve been replacing some RB411AR and WRAP 1C by RB433s …
I was powering the old boards with a lead-acid car battery + charger which means a steady 13.6Vdc that hit those cards after lets say 10m UTP cable.
Under mains power failure the boards keep running for … 24 … 36h, sometimes more, no problem at all.
After that, using RB433 I noticed that after 3 or 4 hour this board starts to reboot and then shut down. Once it was necessary to reconfigure it because it lost PCI info.
What I realized is that 433 enters in a gray area when battery voltage falls to 11.8 … 12V.
Ok, 11V on a nominal 12V lead acid battery means fully discharged. But 11.6 … 11.8 … 12V …
RB433 specs says 10 to 28V at POE or power jack.
To standarize all APs I’m changing to 2 x 12V batteries + fluctuation charger (27,6V) and a linear voltage regulator which drops this voltage to 22V.
Does anyone have the same behaviour on RB433 when powered with 11 … 12V?
it might be that these boards have a bit different protection and voltage drop is bigger as a result. Router itself still could work, but seems that it cannot cope with wifi card power spikes at these low values.
I see. They’re loaded with 2 x R52nM (I’ve been changing all existing cards by R52nM where I use to had SR2, XR2, R52Hn, R52n to take advantage of the 52nM 1.8W power sink).
Well, I’ll keep the 22V option (2 batteries + charger + home built 22V voltage regulator with histeresis which turn POE off when batteries voltage hit 11.5V each).
Once on a 433 + 12V battery which have a XR9 I tried to use NV2 on 900MHz and after some seconds router rebooted. Inspecting log / terminal there was a “cause (1)” which means low voltage or voltage missing.