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Old 08-28-2017, 05:57 AM   #3
O C Diver
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City: Fort Myers, FL... Summers in Crisfield, MD
Country: USA
Vessel Name: Slow Hand
Vessel Model: Cherubini Independence 45
Join Date: Dec 2010
Posts: 7,907
Regarding isolator versus combiner, they both can fail. The continous duty solenoid works well bet they do have a finite life, keep a replacement on board. When I used one on my charter boat, they typically lasted 3 or 4 years. Isolators seem to work ok, but need to be rated well above maximum amperage of the alternator. Had one fail where the primary diode failed which spiked the voltage to the secondary battery way up. This was a function of how the alternator sensed battery voltage. There may be a better way to wire them into the system, but this spooked me away from using them.

Ted
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