![]() ![]() ![]() Sailboats with two identical batteries used interchangeably for starting and house electrical loads.Runabouts or other small powerboats using a single battery for both starting and running loads with the engine turned off.Since they have lower storage capacity than comparably-sized deep cycles, we recommend them for the following applications: With large, thick plates containing more antimony than starting batteries and an active lead paste chemistry, dual-purpose batteries are a good compromise, tolerating deep discharges that would ruin a typical starting battery. Group 24 Dual-Purpose Battery Dual-Purpose Batteries Generally, deep cycle batteries should be sized to store three to four times the expected amount of energy to be used between recharge cycles. When the batteries are recharged, energy is re-deposited into the bank, and the process, or cycle, starts over. Overnight, their use might deplete 50–70 percent of the battery capacity, depending on the house loads of the boat. Consider them a kind of savings account into which energy is deposited or withdrawn.Ĭompared to starting batteries, which deliver high bursts of energy for short periods, deep cycle batteries recover fully after being heavily discharged over longer periods because their design features thicker plates with a high content of antimony. They power the electrical loads on your boat when no charge source (shore power charger, engine alternator, wind generator or solar panel) is available. Your boat's house battery bank uses deep cycle batteries, the marathon runners of the storage system. You'll need a pair connected in series for 12 volts. This GC2 deep cycle battery (Model 15020340) is rated at 230 amp-hours and weighs 64lb. Six volt “Traction Batteries” are heavily over-built for industrial applications. The two drawbacks of this construction are that the plates are relatively fragile in high-impact environments, and that starting batteries do not tolerate deep discharges, which reduce their operating lifespan. Starting batteries have thinner and more numerous plates, providing extra surface area to generate high amperage bursts of current. Like all lead-acid batteries, they are constructed with alternating layers of negative and positive plates with insulation between them. ![]() They deliver between 75 and 400 amperes for 5–15 seconds, and then are recharged in short order by your engine's alternator. Starting batteries, which crank the starter of your boat's engine, are the sprinters of your electrical system. Let's begin by discussing the three battery types and then move on to the characteristics of the different battery chemistries from which you can select. For example, will it be used for starting an engine, powering "house" loads or maybe for both? Your choice of battery chemistries will depend on the performance you desire-balanced against how much you are willing to spend. When choosing a battery, first consider how the battery will be used. Each of these battery types is offered with a choice of battery chemistries, which are flooded lead acid, gel, AGM (Absorbed Glass Matt) and most recently, Lithium Iron Phosphate. West Marine offers three different types of batteries: Starting, deep cycle and dual-purpose. It uses lead-calcium chemistry, has a no-spill design, and can be tilted to a 45° angle. This Group 24 marine starting battery is not just a car battery. ![]()
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