[RedDevil]

Originally Posted by gumby79

WOT to park no no agreed. The cat starts working minutes after start up and is working for some time after shut down till it gets under 6-800f . Theas have started many fires from people driving at slower than ecomodder speeds , was a major problem when they first came out. Finding the happy spot or controlling the hot side temp is the problem the high temp TEG are too spendy and 12-1600f is way too hot .
If your cooling pump or fan used say 10% of power production then why not let it top up the battery recapturing more of the energy already invested? Cost /w is high at this stage of development, so by the eg in the beginning we are only able to use a fraction of whats needed. By charging 120% of running time the % just got bigger.
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a way to extend cat heat/power production @900f add 1 drop fule. the cat will catalyze the pure hydrocodone yealding heat allowing (just a guess) 10-15mun extension of charge time per drop.alowing for 2-500% charge timeV drive time.

Once the engine is killed the flow stops and the reaction in the cats stops too. If it didn't the cats would normally do a bad job, as the exhaust gas has to be treated in the fraction of a second it takes to pass through them.
The (relatively heavy and bulky) cats will remain hot for a while; park in high dry grass on a hot day and you'll start a fire.
The pipe behind it will cool rapidly however, especially with a herd of heat sink TEGs scavenging heat.
The residual exhaust gas has hardly any thermal mass, unlike the TEGs. The only remaining heat source it conductive though the exhaust pipe from the cats. I can't see how the temperature could rise after key-off?
If it is safe to run them, nothing can harm them afterwards.