We've got an off-grid solar system in the works. Four solar panels with 24volt DC output to a eight batteries then to an inverter which power to the refrigerator or whatever other device.

Most all the solar systems here are on-grid and provide no power when the grid shuts down or there is a local black-out. Those are the systems the companies here push though with a large system to knock down you monthly electricity bill. Our E bill isn't big enough for them to bother, but we still need to run the 'fridge. So we opted for a smaller off-grid solar system.