As I recall the voltage was similar to a AA battery (per module) with a 30+ degree difference on each side of the cell, so a lot of modules could be assembled i

As I recall the voltage was similar to a AA battery (per module) with a 30+ degree difference on each side of the cell, so a lot of modules could be assembled in an array to generate useful power. A lot of small boat/RV refrigerators use these for their direct thermal effect (one side will get ice cold when powered). My experiment was a smaller scale parabolic solar trough design with a line of modules along the focus point since I needed to heat water anyway to regulate temperatures in an aquaponics system (fish farm). Side note, I've seen successful systems out there that use Stirling engines to power a generator from the concentrated solar heat.