I have a 13kw generator but with this last hurricane, I could not get outside to set it up for over 4 hours. We had to throw out some food in the refrigerator. I decided to bite the bullet and try a battery backup system. I liked the Anker Solix because it provided a 50amp and a 30amp 240v outlets, where others you had to combine 2 units to get 30amp 240v. I received this two weeks ago but finally got to run a test on this unit today, which is the F3800 plus one battery pack. I have a 30amp receptacle wired into the panel, which is what I used to plug my generator into. Mine is a manual switchover whee I have to turn the main breaker off first, connect the generator and then turn the 30amp breaker on to provide power to the home. Instead of plugging in the generator, I plugged in the Anker F3800 using the 30amp outlet. My home is 1800sf, gas heat and cooktop and a 3 ton A/C unit. It ran all of this fine except for a little light flicker when the A/C kicked on. Will probably order a softstart to reduce the initial amp draw. I am thinking of installing an automatic transfer switch and leaving the Anker F3800 plugged into it so I can have immediate power without having to go through the manual process of switching power. I tested the unit for a little over 3 hours, letting the A/C start and stop multiple times. I started out with a total of about 10 hours of run time with just the lights, TV and refrigerator on, pulling between 650-700 watts of power. When the A/C kicked on, it showed about 2 1/2 hours of run time as it was pulling about 3900w. Once the A/C turned off, it adjusted back to 9 hours. After 3 1/2 hours of testing, it showed I still had 8 hours of run time with just the lights, TV and refrigerator running. I know this will not carry me through a hurricane where we lose power for days or weeks but when the battery power is used up, I can start my generator, run the house and recharge this unit. May look at solar panels in the future. Over all, even though it is expensive, it is doing what I want it to do. For those reviews that said the fans are extremely noisy, I did not experience that so they may have fixed it with a software upgrade.