This is somewhat of a complicated subject. BUT DEFINETLY WORTH LOOKING INTO. Replace your old lead batteries with new ones. Say 210 amp 6 volt. Add a lithium battery in parallel with a Battery Bank Manager between the two different battery chemistries.
All loads will still come of your lead...
Hi,
I have spent many hours researching the exact same problem you have. We are not Marina boaters. We are on the anchor or a mooring when cruising. We run two frigs and a chest freezer. We run the generator for a couple of hours before bedding down. Over night we burn 80+ amps. These deep...