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Perhaps the biggest advantage of an AC or DC capable router is; you can use whichever is available where you want to install a router. BTW, some platforms actually allow using both at the same time.
One common advantage of AC, it usually supports higher wattage.
Can you connect your DC powered 2911 directly to your UPS battery? Well if the UPS battery provides 24 to 60 VDC, and it can support the necessary amperage, I would think it should work.
