Thread: Two Alternators
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Old 10-19-2017, 11:47 AM   #5
Ski in NC
Technical Guru
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City: Wilmington, NC
Country: USA
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 5,451
My Balmar alternator (100A) output can be outstripped by load when running slow at night with everything on. Volts drop from 13.8 to to around 13. If it goes into the low 12's I just crank up the gennie and use the charger to augment. Only had to do it a few times.

When trolling (daytime) I run super slow (650rpm, about 5.5-6kts but DC load is less so volts stay up.

I would consider getting rid of the second alt. If you have volt drop issues, you may be able to find a higher output alt that fits where the factory one goes.

Take the belt off the second one and see how your volts do. If ok, take the thing off.
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