We bought the boat in 2010. It was 9 years old then on its original batteries. That’s along time for batteries. 7 years is a great car battery. We never plug into shore power, all electricity has come from solar or engine alternators.

This trip I noticed the battery voltage getting weak in the wee hours on those late/middle of the night boat checks.

Seeing voltage down near 12.1 is not bad but less than ideal. One night I saw 11.9. Time for concern.

Today ran the Honda generator. Mostly all bulk load, 60 amps going into the bank. Voltage is up to 12.3 early eve.

Will need to run generator again. Seems the little Honda is out producing the master volt alternators, need more data to back that up.

The one thing that it helps quantify it is the house bank switch on the port side is being a little finicky which might cause some loss of current during charging.