It's the size of the boat as much as it's the number of accessories and THEIR size. The fridge, microwave, number of TV and lights, etc, all add up to a greater draw on the battery setup. My 348 really didn't want to last all day running the radio, tv, fridge and accessories. A trip anchored up around 1pm would end up with the single system battery petering out by around 2am. Just in time to wake my half-crocked soul out of be in a fright when the Carbon Monoxide alarm would trip due to low voltage. Suffice to say, that's not a time, nor state, you want to find yourself rummaging for a manual...
I added a pair of 12v deep cycle golf cart batteries and now get all weekend. Granted, that's with a run of usually about an hour and thus recharging them somewhat. I've never measure to see how long it takes to recharge them, I suppose it'd be worth knowing at some point.
Some fridge units have an easily accessible off switch. Some have a breaker you can flip. Our 348 has neither. You have to manually turn down the thermostat, which of course never gets done. The fridge is a VERY high drain on the batteries. If you can live with turning it off, and not opening it, things stay sufficiently cold in there. Long enough to last, say, from just after dinner until the following morning. That'd help stretch battery life.
But for me it was easier to just add a pair of batteries instead. Including the batteries I'd guess it ran me no more than around $300 in parts, all told. Batteries, the boxes for them, straps to hold them down, strips of molding and screws to make a box-like frame to keep them in position and then a whole bunch of 0/1 gauge wire from the stern to the other batteries and charger. A big hit was buying the tool to crimp the lugs on to the ends of the wire. A local auto battery shop had one that looks sort of like a little bottle jack for $25. You put the lug under the pin and SMACK IT with a hammer to pinch the lug onto the wire.
We've had mixed success with overnight anchoring, such that we're really not likely to spend nights out when the generator would be needed for AC. We'd rather get a slip and use shore power instead of dealing with the noise of the genset (for us and nearby boats) and the CO fume risks. So it really ends up being an accessory that doesn't see much use other than firing up the blender, microwave and coffee pot. Being able to use them is, of course, essential but their short run-time could be just as well served from our extended battery bank. Resale would take a hit though if the boat lacked a genset.
_________________ -Bill Kearney, 2005 348 Vista
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