Originally Posted by N4712
We normally cruise around 1900 RPM.
Research the max RPM required to get full output from the alternators, re-ratio them to do it at, say, 2050, and your batteries would be well fed from now on. You might need to remove the drive belts for red line checks (prop sizing or whatever) but that wouldn't be necessary very often.
I imagine they don't do this at the yard due to concerns of over-speed damage done at red line.
Edit: The smaller alternator (on most Nordys) is used to charge the engine/genset starting battery, so I wouldn't mess with it.