Also remember that putting a huge alternator on a diesel like ours can present excessive side-loading to the shaft bearings, reducing their life. So try to size appropriately for your battery bank AND engine hp. Going too big can be bad for your engine.
Fred Street -- Minneapolis S/V Oceanis (1979 C&C Landfall 38) -- on the hard in Bayfield, WI :^( On Dec 18, 2013, at 9:18 AM, Steve Thomas <sthom...@sympatico.ca> wrote: > Excellent comments Rich. > > I would add that one needs to confirm that the power take off available for > driving a proposed larger alternator can handle the increased load. This is > especially true for engines where the power take off is through a gear train, > and not directly off one end of the crankshaft. In these circumstances it may > not be just a question of how large a fraction of the engine's output do you > want to direct to the alternator. The maximum load presented by the proposed > alternator, plus the water pump load, must not exceed the power take off > design limits. This is at least an issue with the Yanmar YSE, YSB, and YSM > series of engines. I don't know if there are any other common engine with > designs similar in that respect, but it is worth checking before going and an > buying too large an alternator for a specific engine. Yes the specific > engines I mentioned are smaller than 20-35 HP, but there are many of us that > do have em. An alternator that can actually deliver 100 amps will need around > 3 horsepower to drive it. > > Steve Thomas > C&C27 MKIII > Port Stanley, ON
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