Thermoelectrics to replace car alternators

The only previously known automotive application was seen in 1988 when Porsche experimented thermoelectric generator powered by exhaust heat on a 944 which could generate 20-30W of power, but the tech never made its way beyond the prototype phase. But currently, both Volkswagen and BMW have developed thermoelectric generators that recover the waste heat from an internal combustion engine. Volkswagen's claims its generator is capable of generating up to 600W under highway driving conditions and can meet 30 percent of a car's electrical requirements. BMW's exhaust powered generator has demonstrated an output of 200W over 12,000km of road use.

By taking over the duties of a conventional alternator, these thermoelectric generators can reduce the mechanical load on the engine, thereby increasing the life of various wearable parts and also a reduction in fuel consumption by as much as 5 percent.