After a power outage, I connected my refrigerator to this power supply. Sadly, its inverter was unable to support my refrigerator. The Duracell DPP-600HD doesn't have enough momentary  output to handle the initial start-up current spike of a refrigerator's compressor motor. The specifications say it can momentarily provide up to 960 watts. This equates to 8 amps at 120v.  Yet, public benchmark figures for a home refrigerator's start-up current indicate 13 amps for up to 1/2 second. Other appliances that use electric motors such as sump pumps are likely to exhibit the same characteristics. My suggestion is that customers immediately test this product with any device they intend to power during an outage.Some important specifications are missing in the Amazon listing.  One of the key statics is the capacity of the internal battery, which is 28 amp-hours at 12 v.  This equates to 336 watt hours.  Yet, AC output is much lower than this presumably due to inverter losses.  These losses increase with power output.  The following table illustrates this.  The last column is my calculation.load.................watts....hours....watt-hoursCordless telephone.....5........35.0 ...175Portable stereo.........10........22.0 ...220Laptop computer.......20........7.0 ....140Fan.......................100.........1.7....17036" TV...................133........1.2 ....1603/8 drill.................300........0.4 ....115Warm-air fan heater.312........0.4 ....109Blender..................385........0.3 ....109HID Floodlights.......400........0.3.....107Observe that the total energy delivered (watt-hour) drops with power consumption.  Ultimately, the usable energy is significantly less than what is contained within the lead acid battery.For reference, a refrigerator will use about 200 watts of electricity when the compressor is running. Typical consumers will have their refrigerator running about 50% to 60% of the time, which equates to an average of 100-120 watts being consumed continuously.ConsDoesn't handle current spikes associated with certain electric motorsProsBoth AC and DC outputPortableSimple operation