Depending on your UPS, the manufacturers should have a calculator on their website. The RD3 is not a DC pump. It’s a variable voltage AC pump so there is no other way to connect it to a battery backup other then via the 110v connections on a UPS. And you need a pure sinewave UPS. If the UPS of your choice is pure sinewave, it will be mentioned in the specs.
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Director Customer Support Royal Exclusiv USA
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Current Tank Info: 480G display mixed reef, 90G sump, 90G refugium, 60G display refugium. Check out my build thread: http://www.reefcentral.com/forums/showthread.php?t=1783476
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