Boat Battery : What is it?
 Boat batteries power the trolling motor and other moving parts of electric boats. They are designed to tolerate the humid environments in the bilge or engine room, where they are usually located. Most standard boats use 12-volt battery systems consisting of one to four parallel batteries. Yachts and other large boats usually require 24- to 32-volt systems. In most boats, battery systems are connected to an engine selector switch, which allows the user to select a bank source for the batteries. |
Kinds of Boat Batteries include the following:
Primary batteries
Also called dry cell batteries, these batteries supply a fixed amount of energy and cannot be recharged.
They usually decline in power as they discharge, but are fairly reliable for all boat sizes.
They are also used in portable electronics like wristwatches and flashlights.
Secondary batteries
Secondary batteries, also called storage batteries have a reversible chemical reaction that allows them to be recharged.
They connect to the boat’s electrical system using positive and negative posts.
They usually have a liquid-proof housing made of metal alloy, plastic, or hard rubber.
Each battery features a cap opening for adding distilled water to the electrolyte, causing a chemical reaction that produces electricity. This reaction produces hydrogen as a by-product, making the cell highly flammable.
Types of storage batteries
Starting batteries
Starting batteries are used to supply power to the engine during startup.
They are designed to provide high discharges and are recharged immediately by the alternator.
Deep-cycle batteries
Deep-cycle batteries are designed to withstand frequent heavy discharges and recharging.
They are efficient for general power supply and smaller applications like lights and sound.
Maintenance-free" and gel cell batteries
These boat batteries have electrolytes in gel form instead of liquid.
They are more expensive than standard boat batteries, but the electrolyte level cannot be monitored as clearly as liquid electrolytes. |
HUP rating: Choose a boat battery with a high HUP (hours of usable power) rating. Look for one with a draw of about 15 amps at half speed, which will last about 5.6 hours with a constant load. Also consider the other devices you want to connect to the battery, such as depth finders, aerators, and running lights.
Wiring: Choose a boat battery with thin, short wires to reduce resistance and enhance power transmission. Avoid batteries over 21 feet long because they are less efficient at transmitting current and more prone to interference. Smaller wires also overheat faster, increasing the risk of fires. |
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