I would want the SunDanzer freezer to have the facility to operate as a refrigerator as well (especially for the asking price) due to the fact that the temperatures they operate should be programmable i.e. a simple PIC based, 3 term controller be implemented for variable temperature control would only cost a few dollars to implement. This would allow the Freezer (-18C) to operate as a refrigerator (+2 to +6C) if solar power outputs are limited.