wrote:
I have an older Honda 10 hp outboard that has a charging circuit. The
small boat that it is on has a bilge pump and small AGM battery. The
outboard's charging circuit puts out over 15 volts. Can I put a diode
in the circuit to reduce the voltage? If so what kind of diode?

thanks


Changing to a flooded battery sounds
reasonable, but if you're determined to
use the AGM, place a high current diode
in series with the battery lead. It will
drop 0.6 to 0.9 volts as long as the
current is greater than a few tens of
milliamperes. Couple of bucks. Bolt it
to a chunk of aluminum as a heat sink
and make sure it is rated to handle the
current involved.

No need to use a galvanic isolator at all.

Chuck

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