96kpmjmm
Member
I have a 37 ft 2006 Nordic Tug. It has a Onan 9kw generator and a Xantrex tc 40 multistage battery charger. When we bought the boat it had 4, 6 volt Interstate deep cycle workaholic u 2400 golf cart batteries in a series and parallel connection ( 12 volt system )(251 amp hours each) .The batteries were at the end of their life and it was suggested that I replace them with 4 Optima AGM Blue top SC31DM 12 volt batteries. They are rated CCA 900, Crackling amps 1125, AH 75 and a reserve capacity of BCI 155 minutes with a 25 amp discharge. I have 2 Optima AGM SC34M as my start batteries. When we are under way the alternator will handle the charging. When we are on the hook/mooring and we are on the boat ( generally 7: 30 am to 9: 00 am and 5:00 pm till 11:00 pm) we will run the generator that will run the battery charger. When we are off the boat sightseeing and asleep at night, the house batteries will handle our power. This will include a small nova-kool refrigerator 4.3 cu ft and a small freezer 3.5 cu ft and additionally at night, an anchor light, vacuum flush head, Garmin 7212 and a couple lights as needed.
So my questions are:
1 Are there any advantages to 12 volt over 6 volt or 6 volt over 12 volt?
2 Why is the 6 volt battery 251 amp hours but the blue top battery only 75 amp hours?
3 Are the 4 SC31DMs enough power for my intended usage?
4 For house batteries which is most important : AMP hours or reserve capacity ?
Any and all suggestions welcome!
So my questions are:
1 Are there any advantages to 12 volt over 6 volt or 6 volt over 12 volt?
2 Why is the 6 volt battery 251 amp hours but the blue top battery only 75 amp hours?
3 Are the 4 SC31DMs enough power for my intended usage?
4 For house batteries which is most important : AMP hours or reserve capacity ?
Any and all suggestions welcome!