That device is not legal in the US. The NEC forbids a plugin device. Since you are not in the US you would need to ask those in Antigua/Barbuda what they think.
Read the reviews on the device. The link for reviews is on the same page. The top listed reviewer has a picture of the unit after it caught fire. Another reviewer said the device would freeze up (firmware problem?) and would have to be restarted manually and mentioned an internal fuse.
http://www.amazon.com/Inverter-Converter-Turbine-Generator-Stackable/product-reviews/B00E3Q85UO/ref=cm_cr_dp_synop?ie=UTF8&showViewpoints=0&sortBy=bySubmissionDateDescending#ROVMVQT6734YSOne reviewer said the input voltage window was 22 to 60. That is low compared to commercial grade equipment. With solar panels alone that range should be easy to meet. I don't think you could get much useful power from a homemade mill in that range wthout adding batteries to clamp the voltage.
What are you trying to do? If your electricity costs are too high, conservation measures will give you a much better return for the time and money invested. If you need hot water a direct thermal hot water system would remove your hot water heater from the grid.
I dry my clothes on a wooden rack indoors, so I don't need an electric dryer.
Refrigeration is a large user of electricity. Smaller refrigerators are not neccessarily more efficient. Keeping the hot side coils clean, putting the fridge away from the wall and counters so air can flow around it cuts energy use. Make sure the door is level and the seals tight.
Switching your incandescent lighting to LEDs can save a lot.
Here is a pic of the burned out inverter someone in the solar business who repairs panels tried to use.
