The eight-outlet CyberPower SL700U has a problem: it’s not exactly fish nor fowl. This well-made, relatively compact unit can provide backup power of up to 370 watts/700 volt-amperes (VA), enough to provide standby power for about nine minutes for a modest computer, like an iMac or mid-range Dell Inspiron tower with an external monitor.

This UPS, however, offers power output from its battery that only simulates the smooth sine wave produced by alternating-current power that comes from an electric utility.
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