90 amp alternator on a V-belt?

[fredrussell]

My alternator is making end of life noises (bearings). Ages ago someone gave me a Prestolite 90 amp alternator. Would this be too much for a v-belt? It’s a Yanmar 3GM30. I believe modern Yanmars have 120 amp alternators but on a toothed belt.

 

[Slipstream 34]

We are running a Prestolite 90Amp alternator on a Perkins 4108 with a V Belt. Charging a 400 Amp/H lithium bank. DC to DC charger limited to 45 amps draw. I had tested it drawing as much as 70 amps but reduced it to prolong the life of the alternator. In our 3rd year with no issues.

 

[Ceirwan]

You should be about OK at 90. Its upper range, but the alternator can't put out that full 90 amps for long anyway before overheating.

 

[fredrussell]

Excellent. Many thanks.

 

[Porthandbuoy]

Sheolin is fitted with a 100A Balmar alternator which ate V-belts until I fitted a Gates Quad Power Cogged Belt. No more black dust in the engine bay and, other than checking the tension occasionally, never seems to need adjusting.

 

[Boater Sam]

It will be fine on a cogged belt, a V belt with gaps around the inner circumference, not a poly v belt which is what the 120A alternator needs.