Jeff,

We decided to stick with the Rotax recommendation on our S7 and went with a 25 amp breaker......the total running load on this side of the system is more like 15 amps max.

The 25 amp breaker is one of those you can pull to open in the event somethng goes kafutz and I would want to be able cut the alternator out. The alternator is left connected all the time, starting as well as running.

In this case, we installed a voltmeter rather than an ammeter to monitor the charging system condition.

Sincerely,

Dave S
KF7 Trigear
912ULS Warp Drive