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I have two switches, a WS-6-Mini and a WS-12-250-DC and I would like to know if this wiring scheme would work for a power fail scenario. I plan on using a power fail control relay to do the switching between the 24v PSU and the battery power for the WS-6-Mini. The WS-12-250-DC will be connected to the battery directly. I'm tempted to put a low voltage disconnect for the battery to prevent it from being drained.

Is there any suggestion or concerns?

*For better resolution click on the pdf attachment

Part List:

Meanwell 24v-240W Power Supply
Meanwell 24v/48v DC to DC Converter
Netonix WS-12-250-DC Switch
Netonix WS-6-Mini Switch
Idec 24V DPDT Relay
Minn Kota On-Board Precision Charger - 2 Banks, 6 Amps
12v-50Ah AGM Battery (x2)
Low voltage disconnect ( Need Suggestions)

Side question: If I have a WS-6-mini and a WS-12-DC that consume a combines total of 36w. Would it be okay to power both the units on a single 48V-120w power supply?

side question seems okay to me....

Looks to me like the WS-12-250-DC already has a LVD (hibernate) built-in, under the power tab. So you could set a voltage level for shutdown / bootup through the switch config for that unit. You could also use the WS-12 to power the WS-6.

I've recently posted if the DC feature for shutdown/startup could be implemented in the Ws-6-mini, since the voltage level is available, and all POE ports could be turned off/on based on that value. That would reduce the dependence on external components to achieve your objective.

To that end, I also posted if Netonix would consider open sourcing the firmware, so that those who are able to contribute to troubleshooting or feature enhancements could do so. This is a great product, and I wish to see it move forward, even if that requires a community effort.