Holly crap.....5 batteries just on the port side? Are you planning to anchor for a week without running the genny........LOL? I added 1 extra (total of 3 on the port side) and never had a problem in the last 7-9 years.....and I "live" on the hook. I added one more battery and I did not get much improvement. I run the generator in the morning and the 300W ( yeah, right...a lot less output than that) solar panels. Still do not have full enough charge. I still have to run the generator in the evening. There are 3 fridges...the main fridge, a deep freezer and the beverage fridge in the cockpit. We are careful with our usage and have LED on all the lights. I will keep working on it till we get it right!