I have an off-road trailer that I use for research. I purchased the APS750 and coupled it with a 105 AH AGM battery in the nose box of the trailer. Away from mains power, it provides excellent run time for several laptops and communications equipment. I keep the battery charged with solar panels off-road and take advantage of the 20A charging capacity of the APS750 when mains power is available. It's a 750 watt inverter, transfer switch, and battery charger in a rugged package - perfect for my needs. I highly recommend the APS750 for mobile applications where high quality and reliable power is important. I can see where it might make a good emergency power system too.