A couple of Trojan J305H 6 volt batteries will give you 335 Amp Hours.
Thats 16 3/4 hours at a 20 amp rate or 745 minutes (12.4 hours) at a 25
amp rate. they are only 1 1/4" longer and 3 1/2" higher than a T-105,
however they do weigh 97 pounds each (70# more than a pair of T-105's)
Krj

MikeH wrote:
Harlan,
I wanted a lot of capacity for my electricals while at hook, so I
researched a lot of batteries. I finally put two Trojan 105's (6V deep
cycles) in series for my boat. They have 447 minutes (7.45 hours) of
capacity at 25 amps and were about $85 each. The only drawback is they
weigh 60 Lbs apiece! Hope this helps.
Fair winds,
MikeH
s/v Making Memories
Perrysburg, OH

Harlan Lachman wrote:

I have sleep apnea. That means I have to hook up my nose to a machine
blowing air into me all night long. Heated humidification makes it
better but in the summer, if humidity levels are high enough is not as
important.

This takes electricity. At a dock and plugged in, no problem. But
since I have been plugged in, I have not had the joy of dropping a
hook in a beautiful gunkhole. This is gonna change.

Anyone have a recommendation for a deep cycle battery with lots of
(the most?) amp hours which I can drain at night and rely on fully
recharging during the day?

harlan