[rtkwe]

Peltiers and other thermoelectric generation is really really inefficient compared to basically any other energy capture method. They're about 5-15% max that we know how to make currently. Basically they only get used for things like RTGs where you need a zero maintenance very long lasting electric source; in the US that's mostly been spacecraft but in the USSR they were used for extremely remote lighthouses around the Arctic Circle where solar was impractical and resupply (and maintenance) of a diesel generator was prohibitively expensive.