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Free minder
Join Date: Nov 2001
Location: Middlessex county, MA
Posts: 9,418
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It makes a lot of sense to use a small IC engine just to charge batteries, because battery charging can be 100% efficient (if the charging rate is not too high) and electric motors are 90% efficient. IC motors efficiency varies a lot with rpm, so keeping them at optimal rpm will make the overall system more energy efficient than using the IC motor for propulsion.
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1978 SC Targa, DC15 cams, 9.3:1 cr, backdated heat, sport exhaust https://1978sctarga.car.blog/
2014 Cayenne platinum edition
2008 Benz C300 (wife’s)
2010 Honda Civic LX (daughter’s)
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