I'm installing a bilge pump and and also re-installing my old fishfinder. I have no use for a battery other than to power these two items. The bilge pump draws 3.3 amps, and the fishfinder only 100 ma. Obviously, the pump would not run all the time. I'm looking for a small battery that would survive the marine environment. Any suggestions? Thanks.
The draw from my pump is 2 amps per hour
so figure worst case 6 hours use is 12 amp-hours.
Not a very big battery needed.
Probably won't get used at all on most trips.
But it's a safety item so I'll spend the money.
My whole cockpit doesn't hold 300 gallons.
So a 550 gph works for me.
You've got more volume in your LT. Bigger pump, more draw.
I'm an optimist, I'm positive things are going to go wrong.
I try to plan for when bad things happen.
I'd go with at least a 12 A-H battery.
Figuring a bad day with a slow ride home and a leak.
Difference in price between an 8 and a 12 A-H isn't much.