[ragerino]

That's a cool idea.

I came across this link because I want to build cheap small sensor stations using LoRa to transmit data (gps location?, temp, humidity, air quality) to a central server.

Solar is not really an option because it needs to be cleaned once in a while.

[hooande]

how big of a temperature difference do thermoelectric materials usually require? is it like dozens or hundreds of degrees over a given period, or something that's likely to be encountered in a normal environment?

[icegreentea2]

Typical applications span the order of tens of degrees Celsius.