Think Max draw is around 120w.I'm using a CyberPower 1500VA which is massive overkill for my DS920.
Do you know what your raid server is drawing in terms of load?
That's a great point, will look on eBay. I take it AVR is more important than sine wave as it will be set up to shut off server ?For home use, I tend to pull in older APC units and run NUT on UnRAID, buy a decent capacity unit and you get to run router/modem/switch or in my case two servers and the rest of the rack for an extended period. They're often sold off cheap without cells, but be warned, non-genuine APC cells tend to last beyond the warranty period, but not as long as genuine.