Thread: Battery Check
View Single Post
Old 03-21-2023, 06:34 AM   #7
ranger58sb's Avatar
City: Annapolis
Vessel Name: Ranger
Vessel Model: 58' Sedan Bridge
Join Date: Aug 2013
Posts: 6,847
Originally Posted by BruceK View Post
After "online shopping", I was at the boat today measuring the existing batts. Another Optima Oddessy is about all that fits the bowthruster location, about $300 AUD.

The Genset 150Ah batt(? 6D in US parlance), was alarmingly hot.

I wonder how charging the 2 peripheral batteries via an 8D SLA affects things, the peripherals are not talking direct to the charger. Not sure but I think combiners are just voltage actuated.

We are making headway. Unfortunately both electricians I wanted to try are away interstate for several months. Marine service people are thin on the ground here.

Optima and Odyssey in the same sentence sounds odd. Here, those are two different brands. Reading suggests Optima started out with a good rep, and has gone downhill from there... apparently after being sold off to a different manufacturer from original.

An Odyssey G31 sounds very viable for a thruster, if that's what will fit. Somebody on the forum recently confirmed one of the thruster installer companies over here usually fits two Odyssey G31s near their thrusters...

Sounds like a huge battery for genset starting. Our current is a flooded G24, and whenever it craps out I'll probably switch to a relatively tiny Odyssey Extreme ODX-AGM34 (was PC-1500) with 850 CCA.

BTW, we ran for several years with no charger on our genset battery other then the generator's alternator. The AGM didn't self-discharge much, so no problem. We happen to have a dedicated charger for the genset battery on this boat, and our other banks are 24V, so I'll keep it I guess... but don't really think it's all that necessary in an all-12V boat. Especially if it's easy to use jumper cables from some other 12V source in an emergency.

Pinning down those connection between batteries will probably move you further ahead...

Chesapeake Bay, USA
ranger58sb is offline   Reply With Quote