It seems unusual for me to be the first to comment on my own post.
So far, I have found out that the Honda 9.9 electric start outboard
Does have a built-in regulator.
I bought the service
and installation manuals
for the motor. These show the regulator, but do not seem to show the control voltage setting. In other words, what the high limit on charging
voltage might be.
As I currently understand the battery technology, AGM
batteries are very sensitive to overvoltage charging. Other posts seem to indicate that they function best if they should only be discharged to 50% of capacity, as judged by terminal voltage under moderate load.
Honda seems to recommend a two battery installation
. One battery is to be used as the starting battery, and the other as the house battery. They also recommend a combination switch and control device made by BEP marine
The BEP device is an automatic switch relay. And it seems to have isolation switches for ewach battery and a third switch that can be used to emergency
overide the dropout of the automatic relay.
With a very small charging alternator, BEP recommends that each battery be limited in capacity to about 60 AH, "to avoid chattering of the relay"
Has anyone out here had any experience and/or comments or success with this combination?
I have used dual bank flooded cell "marine grade" batteries controlled only by a Perko 1-Both-2-Off switch on other boats with reasonable life (5-7 years between replacements)