I'm not familiar with the Harmon and its accessories.
stokersmoker wrote:my stoker will refire after a power loss of up to one hour
The Keystoker and some others will be pretty much dead after 15 min. or so as Freddy said. The battery backup will keep it running until a genny can be started eliminating the outfire and need to rebuild your fire.
stokersmoker wrote: if you have a stoker and it looses power, wont the entire stove stop including the stoker so you wouldn't end up with a mess since it is controlled thermally?? no heat, the feeder doesn't run, so it stops feeding coal=no mess??
You are correct that the entire stove would stop when power goes out. My Keystoker and some others do not have any type of "snap disc" to prevent the stove from powering up and feeding once the power is restored, thus the mess of coal in the ash pan.