Have three pieces: one in the camper at the compressor refrigerator is running, super, nice and quiet, fan comes only briefly when the refrigerator starts. By the soft start function to save battery power (!) When the refrigerator starts. My old inverter has then sometimes just pulled the full power and the harm to life of the battery. Update: the inverters on the bus now has 2000km down. The only weak point is the terminal connections for the battery leads. I had taken self-locking nuts, thereby turning on the power connectors if you rumschraubt more than once tuned. Housing opened, tightened nuts, screwed and now uses standard nuts. Everything OK. You could also take self-locking and open the housing during installation / conversion and re-tighten the nuts inside. Ginge also. So many times I do not anyway.
One is connected to two freezers in the basement, also correctly, the fan remains off (the freezers have a built-in soft start).
One supplies the entire workshop with electricity, and that is clearly the limit of application of the device: a long cable, fluorescent tubes and many large machines. There is not built, and you should take something bigger.
Nevertheless, the integrated soft start function is really perfect solved; they can be easily overload (starting currents of machines) ready and completes the device: protects the battery properly, reliably and quietly (!).