Backup Battery Switch

[Walt]

Originally Posted by iamtheari

Just saw your post today. Thanks for posting it. What is odd to me is to see planes with the IBBS switch located in such a place on the panel that it is not a smooth flow to turn that on as step 1 in the before engine start checklist, as it seems it ought to be.

See post #5...

[tjyak50]

I have occasionally wondered if there is any point in using the IBBS to also power the Standby Alternator reg and field (in parallel, or maybe by some diode or bootstrap switch function).

Probably overthinking options (it?s 115f in Phoenix so I left the hangar to muse wiring).

Could there ever be a case where some independent means of kicking on an alternator might be useful? Sorta rare I suppose

[rv8ch]

Originally Posted by tjyak50

I have occasionally wondered if there is any point in using the IBBS to also power the Standby Alternator reg and field (in parallel, or maybe by some diode or bootstrap switch function).
...

Could there ever be a case where some independent means of kicking on an alternator might be useful? Sorta rare I suppose

Yes, this might be helpful under some very rare circumstances, like main battery failure (wiring problem?) and then during troubleshooting you somehow stop the alternator completely and it needs a bit of juice to get started again. IFR guys might want to consider this scenario during their wiring design phase since a black cockpit on a dark and stormy night is not a fun place to be.