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Rainmachine HD12/16 with embedded Ethernet port (not via USB adapter)

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    DennisT

    I would find POE very helpful, but I'm unsure if POE could provide enough power to drive the valves.

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    lanbrown

    I power mine via PoE.  The issue is, the power is 24VAC so the PoE splitter I use provides 24VAC.  It has the ability to supply up to 80 watts, but my switch can only provide 60 watts.  The PoE splitter is as large as the Rain Machine Pro 16.  So adding PoE support would add cost and size to the unit.  There is an AC to DC converter onboard to provide the DC power to run the electronics, the majority of the power stays at 24VAC to power the sprinkler valves.

     

    So PoE+ (802.3at) can supply 30 watts (PSE) of which 25.5 watts is usable to the PD.  So while the power supply that comes with the Rain Machine is 18 watts (for the Pro 16), there is the conversion factor to take that ~50VDC and convert it to 24VAC.  So not all 25.5 watts would be usable to the PD after the conversion.  So that means that 802.3bt might need to be used which is the four pair variant.  It can provide 60 to 100 watts of power to the PD.  This adds to the BOM and also the size of the Rain Machine.  So I cannot see them adding PoE support even though it would be nice to have.  You can also do what I did and just use a PoE splitter to get PoE capability.  It is just a box near the Rain Machine that has the PoE Input and then an Ethernet and a power plug on the out end.

     

    For reference, to just power on the Rain Machine Pro 16, my switch says it takes 7.1 watts and at idle it is using 6.7 watts.

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