Alternator and battery choices
Thanks so much for your response. I have owned this boat for 5 years and I don't think the alternator has charged the batteries during that time or the previous 25 years either. The solar panels have been solely responsible for charging the batteries. Originally, there were just 2 grp 27s on board but I was inspired by Nigel Calder to make some changes, but at that time I did not realize that the alternator was not charging.
4 years ago I replaced all the battery wiring; adding a new ACR battery combiner and selector switch and fuses. I also replaced the batteries. I went from 2 batteries to 3 batteries: 1 for a starter and 2 for the house bank. They were 3 year old 85 amp hour gel cells that came from a bank UPS system. My solar charger kept them topped up year round with no problem. (My boat lives in Richmond on the San Francisco Bay where there is lots of sunshine.)
Since the solar panels were able to keep the batteries fully charged, wouldn't if I got 3 new batteries for the bank?
Thanks - Larry