This documents the feasibility of running multiple TEGs off a wood burning stove in an attempt to generate electricity from a renewable source when solar is not available. Solar is fine during the Summer or if you live on the equator, but for those of us living nearer the poles of our planet solar is very poor in the winter and so a different solution for 'Off the Grid' power was explored that worked well when it was dark and cold.
Most of the documentation is by means of 3 videos in the instructions - 31 minutes in total. There are also CAD files and PCB files in the 'files' section for the engineering.
These videos document my first attempts at generating electricity from a thermoelectric peltier device in 2012. The TEG that I used is a high powered unit able to withstand high temperatures and specially made for electricity generation.
A ten unit Thermoelectric generator system is shown being constructed and then fitted to a wood burner. The theoretical maximum output is 200 watts. The video shows how the generator was put together and how the wood burner was modified to get maximum heat through the TEGs. The TEGs themselves are able to withstand a constant 325 degrees C on the hot side and require plenty of heat to get the 20 watts that each of them are capable of producing.
In part 3 we successfully generate a significant amount of energy from the woodburning stove. In the first session, a circulation pump, a fan and 10 x 10 watt flood lights are powered up. In the second session, we attempt to get a more balanced load wired up to the tegs and measure a noticable increase in power output. The 10 tegs are wired up in 2 parallel strings and, from the manufacturer's specification, the optimum output voltage is 14.4v . The nearest that we manage is 13.8v, at which we generate 120 watts. The specifications suggest that 200 watts is possible when the load is matched.