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post #8 of Old 09-28-2008
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Originally Posted by k1vsk View Post
Re: battery storage - wet cells won't discharge so you don't have to charge them "once a week". Perhaps monthly might be more accurate and most of us check our boats at least that often so no problem. Also, it probably isn't worth the price of AGMs unless you already have a charging system which can take advantage of their charging scheme.
Hate to break it to you, but a wet cell battery does self-discharge. Otherwise, why would Don Casey say in his book Sailboat Electrics Simplified:

Quote: idle wet cell will lose as much as 1 percent per day...This means even a fully charged wet cell will be 30-percent discharged if idle for a summer month. A battery in this state--idle and discharged--will lose capacity to sulfation.
Granted, it is somewhat temperature dependent, and colder temps will reduce the rate a bit...but over the course of a month, it would probably be still 15-20% self-discharge... so monthly charging really isn't optimal.

Winterizing the water system - there is already lots of info available on the internet I won't reiterate but to say if you are putting antifreeze in your tanks, you're just wasting it. Empty the tanks by pumping and simply introduce antifreeze at a convenient point in the system to the faucets.
On most boats, there isn't a convenient point to introduce antifreeze to the faucets or pumps... and filling the water tank with a couple of gallons of anti-freeze will generally do a good job of it. I'm not suggesting that you fill the water tanks with antifreeze... that is both stupid and expensive.


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Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

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