Try it in a vacuum, you are probably using Peltier devices. Since the Peltier thermoelectric tranceducer needs a temperature differential to work, you need to make sure in vacuum you are able to keep that differential. ( all things in vacuum tend to go to the ground state or equilibrium which is the opposite of what you want, the more differential you have the more electricity). I don't know the rate at which thermal radiation is released in vacuum. Also, try to put out some specs like how much energy / joules received per device. Theoretically, you could use a material (water, mercury or liquid led for increasing high temperature storage) to store the heat until you get all the electricity out of it. Food for thought...
Try it in a vacuum, you are probably using Peltier devices. Since the Peltier thermoelectric tranceducer needs a temperature differential to work, you need to make sure in vacuum you are able to keep that differential. ( all things in vacuum tend to go to the ground state or equilibrium which is the opposite of what you want, the more differential you have the more electricity). I don't know the rate at which thermal radiation is released in vacuum. Also, try to put out some specs like how much energy / joules received per device. Theoretically, you could use a material (water, mercury or liquid led for increasing high temperature storage) to store the heat until you get all the electricity out of it. Food for thought...