By Charlie Wing
Even if you're taking to the ocean less than strength or sail, no matter if you jump round the bay on your runabout or pass oceans on your cruiser, youll locate every thing you must preserve, fix, and improve your boats DC and AC electric structures during this thoroughly useful advisor. Boatowners Illustrated electric guide is the effortless, roll-up-your-sleeves guide for onboard electric initiatives, from solving unfastened connections to rewiring your boat to ABYC standards.
«The Boatowners Illustrated electric guide is ideal for studying how your boats electric procedure and masses of its apparatus works, and it'll be a useful consultant while including gear in addition. This booklet should be in each boaters library as a prepared reference on tips to make powerful upkeep and differences that conform to ABYC standards.»-from the Foreword by way of Ed Sherman, Senior teacher and Curriculum fashion designer, American Boat and Yacht Council
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Additional resources for Boatowner s Illustrated Electrical Handbook
The greater the surface area and thinner the plates, the greater the possible current flow. Engine-starting batteries have many thin plates in order to provide large currents for short periods. The electrodes are also “sponged” (made full of minute holes) in order to further increase surface area. • Lead, lead peroxide, and lead sulfate are not of the same density. When one replaces the other, expansion and contraction tend to dislodge the materials from the grids. Each time a cell is cycled, a small amount of lead sulfate is shed and falls to the bottom of the cell.
Over time this lead sulfate hardens and resists both breaking down and current ﬂow. As a result of the electrical resistance the battery shows a falsely high voltage, appearing to be fully charged when it isn’t. Over time the effective capacity of the battery shrinks. The cure is equalization—a controlled overcharge, during which the cells are brought back to their fully charged states. 04C is applied for 4 hours, or until battery voltage rises to the manufacturer-speciﬁed equalization voltage for the particular battery.
When charging underway or with wind or solar, run time is not an issue, and recharge to above 90% is desirable. We will assume a boat at anchor, a discharge limit of 30 to 50%, and a recharge cutoff of 85 to 90%. Since a battery is usually considered “dead” when it has permanently lost 40% of its rated capacity, we will also derate our batteries by 20%. Example: Our daily load is 75 Ah. We decide to discharge to 30% of capacity and charge to 85%. 18 allows easy determination of the required battery size.