This review is for the Xijia 3600W Hybrid Solar Inverter. The unit was shipped in a plain cardboard box and in addition to the Inverter, it had a 35 page English only User Manual. It is basically an all-in-one MPPT solar charge controller, an AC-DC battery charger and a 3600 watt pure sine wave inverter. It's built in firmware allows you to control various functions like charging current, source of input power priority, source of output power priority, and battery cutoff voltage, amongst many other things. For a backup power source, you must supply a 24 volt battery bank. It does not handle 12V, 36V or 48V battery banks like some other charge controllers can handle. You must also supply some solar panels with a minimum total output of 60 volts and a maximum of 500 volts VOC. It's stated nominal voltage of 240 Vdc. The inverter is designed to be mounted on a concrete wall, or other non-combustible surface. It can also, to some extent act as a limited grid-tie inverter. It is mentioned in the manual that if the solar input exceeds it's required power, the excess can be sent out to the grid, which is user selectable. It can be hooked to the grid or a generator, which acts as an AC power source for whatever you have hooked to your output ports. This is optional. You can use this feature if there is no solar power, or there is not enough solar power to keep up with the load. You can also set it up to bypass the inverter and feed AC power directly to the AC loads that are connected. Inverter output frequency is 50/60 hz selectable and voltage is selectable for 100/105/110/115/120 volts to conform with multiple countries. Battery chemistry is selectable as well and includes flooded lead acid, agm, and various lithium type settings. This is too short of a review to list all the different features, but it is a very versatile unit.It is fairly big at 42.3L x 33.4W x 11H cm and weighs 9 kg. I noticed during operation that it generated a bit of heat, and its 2 bottom mounted fans would intermittantly come on to cool it down. The fans, while efficent, were quite noisy in my opinion. It sucks cool air in through 2 side mounted air filters. There is an on/off power switch on the left side.During my tests, I wired up its AC input to 120V AC power, 60V DC power to the solar input, 24V batteries (2x12V in series) to the battery input, and variable loads to the primary AC output. Its LCD display panel clearly showed sources and values. Initially, the AC power was charging the batteries and supplying the load in an AC bypass mode. As soon as the AC input power was removed, the inverter became powered by the batteries and supplied the AC load. This was accompanied by an aural warning as well as the condition Light changing from blue to red. The load on the batteries would then show the number of watts that were being drawn. Fully charged flooded batteries were kept around 27 volts, unless they were under load in which case they would be something less and decreasing. Plugging it back in gave another aural warning and the red condition light changed from red to blue, and the charge icon would blink (indicating charging mode) as the battery voltage would increase. Everything worked as expected.It has a maximum primary output of 3600 watts with a 5 second surge of 7200 watts. It has a AC secondary output that will put out up to 1200 watts of AC power if the grid power has failed and the batteries are depleted, as long as you have enough solar input. That would easily be enough to power your fridge and freezer during daylight hours in an emergency.Don't lose the manual, because without it, you will not be able to figure out all the modes and functions.You should know that the Xijia 3600W Hybrid Solar Inverter is just one part of a complete system. You will need a solar array of up to 4200 watts (60V-500v VOC), a 24 volt battery bank large enough to supply your required loads for the duration you want reserve power for, circuit breakers, and hookup wire. The batteries need at least 2AWG wire and plan to keep it short to avoid power lost throgh the wire. All other connections use at least 12AWG wire. The hookup, while not difficult, is more complicated than running a popular solar generater with some solar panels. You might need to hire a profssional if you can't do it yourself. It's advantage though is it's configurability and the ability to add more capacity by just adding more batteries. It seems to only have CE certification (European health and safety). It would work well for an off grid location, but might be more than you need for off grid only.