Join Date: Oct 2006
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1- For a short (few hours) day sail, I unplug from the dock and coil on the boat, while still plugged in to the boat's receptacle, for convenience. For a longer trip, I unplug both and stow on the boat, to keep things neat and nautical. Reason: never leave home without your shore power cables. Never ASSUME you'll be returning to your home port.
Also...as a rule of thumb, the FIRST thing I do, when I approach my boat for a sail, is unplug from shore power, especially if you have screw-on rings on your plugs. Disconnecting from shore power is easy to forget, especially if you're itching to get out and enjoy the weather and waves. I almost ripped off my boat's shore power receptacle once (thanks to my very quick hands covering for my very slow brain) when I motored out of my slip with shore power still connected! Had to re-dock and fish half of it out of the water (still (barely) plugged in to the dock). Laugh if you want, but it happens to the best of us. Unless your on your boat for a few hours before leaving dock, with everything on, your gen/alt will top off any battery loss when you motor out.
2- Dry Ice is just carbon dioxide (CO2) in solid form. At normal pressure, CO2 transitions straight from solid to gas form. CO2 will do nothing to your perishables/drinks. The only thing to be aware of is that the CO2 will further lower the temperature of your ice (water freezes at 32F, CO2 at -109F. If you set anything you want frozen near the dry ice or too deep in your wet ice, you're not going to be happy when you thaw it!
3- Two 27s sounds like two house batteries. Always leave the dock topped off. I assume you're running 12V house power, not 24V? If 12V, always run on 1 battery. If one of your batteries is/goes bad, it will drain the other one (Think of two jugs of water. drill a hole in the bottom of one and that one drains; if you drill holes in the sides of each jug and connect them with a tube, they will both stay at the same water level, as you drink from them. If you now drill a hole in the bottom of that one jug, it will drain both jugs, because they are trying to stay equally filled). IMO, the only time to switch to "both" on a 12V system is if neither battery has enough juice to start the engine. At anchor, always keep a reserve battery that is not on a circuit. **** happens, and you always want to know you have a fresh topped battery to start your engine. I have a Cal 25 with a single 27, but I carry a jump starter (like the ones for cars) on board just in case. (My 9.9 has a pull start too, but I avoid it...come to think of it, I've never even pulled it once).
As far as switching while running, just don't pass through "OFF" to get from "1" to "2", doing so will kill the engine and your electronics will all reset (and you will lose all of your AM/FM radio presets and anything else that doesn't have battery backup). If you need to switch from "1" to "2", always go through "BOTH". Finally...if you have a dual bank battery charger on board, just make sure you've wired it to both batteries, so they stay conditioned while you are docked and connected to shore power- again, stay on only one battery in the switch so that a short or battery failure at port doesn't kill both batteries.
"Sattar" Cal 25, #256