Small diesel wing engine for 33ft motor boat

[pvb]

one of the main uses I would be hoping to put the engine to would be as a generator, run through an inverter to power our air conditioning unit, as the air-con would need something like 90 amps at 12v I'm thinking that even a 115 amp alternator would only provide 115 for a peak of a few seconds and not be expected to provide it long term so overheat through running long term at close to capacity. I need to look at if bigger alternators (150 ish) are available to fit the D1 and if the small D1-13 is man enough to run such an alternator.

With adequate cooling air flow, the 115A alternator will produce up to 115A for hours - but it's revs dependent, so the engine would need to be close to peak revs to get max alternator output. A bigger output alternator would almost certainly be a large-frame format and would be difficult to fit.