@RR_NDB
As an alternative path to inducing cell damage, short duration load transients would be tolerable, as long as cells do not drop below minimum voltage.
The APU starter generator is inverter driven. Unlike an old fashioned DC starter motor, it will, at most, pull little more than rated current. Actual startup current will be less than rated current.
I have no data, I'd go for startup current of less than 100A rising to up to 300A. At 300A * 25V = 7.5KW into the inverter, motoring would deliver at least 6KW at the shaft.
Resonant effects can be very damaging, in electrical as well as mechanical systems. Back in the 1920s and 1930s, torsional vibration destroyed plenty of crank shafts and gear boxes of the new twin row radial engines, before it was understood through testing, and well prior to developing the maths behind it.
Resonant currents on the bus would be an ineresting scenario. I experienced load dependent oscillation during charger development.
Last edited by saptzae; 11th February 2013 at 12:15.