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Scope is defined as the 17 montauk boston whaler ratio of water depth (plus freeboard) to anchor line paid out. Most anchoring texts and anchor manufacturers agree that a scope of 7:1 achieves the anchor’s designed 17 montauk boston whaler holding power, and more scope is better than less. In theory, 7:1 scope is 17 montauk boston whaler great, but at a crowded anchorage most cruisers scoff at the idea of 17 montauk boston whaler paying out more than 3:1 or 4:1—there just isn’t that much space for boats to swing. When an anchor is securely set you can consider shortening 17 montauk boston whaler scope in a crowded anchorage.

Once an anchor has been set, it 17 montauk boston whaler will almost always hold the same amount of tension that was used to set it, even if the scope is reduced. This means that you can pay out long scope, pull hard on the anchor rode using the engine, and then shorten scope to reduce swinging room. However, if your boat swings and the anchor has to reset 17 montauk boston whaler itself, it will have to do so at a reduced scope. This is known as Anchoring Russian Roulette.

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• Capacity: Battery capacity 17 montauk boston whaler measurements are commonly expressed in Amp-hours (Ah) and reserve minutes. Amp-hours measure the total amount of energy that a battery can deliver for 20 hours at a constant rate of discharge, before the voltage drops to 10.5 volts. This means that a 200Ah battery can run a 10A load for 20 hours. The reserve minute rating is the number of minutes that a battery can run a 25A load until dropping to 10.5V. A Group 27 deep cycle battery with a rating of 180 reserve minutes will run a 25A load for 3 hours. 17 montauk boston whaler House loads range from 5A to 25A or more. Ah is generally the more relevant measurement for house banks.

• Longevity: While capacity measurements are helpful when sizing batteries for their tasks, batteries should also last a long time. Battery manufacturers measure longevity by discharging full batteries until their voltage drops to 17 montauk boston whaler 10.5 volts. Then the batteries are recharged under controlled conditions, and the process is repeated until the battery fails to hold half of its rated capacity. This measurement, called cycle life, shows how many discharge cycles a battery provides over its lifespan. This ability to cycle 17 montauk boston whaler repeatedly is what differentiates deep cycle batteries from starting batteries, which can’t withstand more than a few deep discharges before they begin to fail. If nothing else, cycle life provides a baseline for comparing one battery to another.

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• Cost: What you want is the greatest number of amp-hours delivered over a battery’s life, at the lowest possible cost. Let’s assume an $80 100Ah battery will provide 200 cycles (of 100% discharge) before 17 montauk boston whaler having to be replaced. Over the life of the battery, you’ll get 20,000Ah (200 cycles x 100Ah). From that follows that one Ah of this battery costs you $0.004.
  But there are caveats:
  1. discharging batteries completely reduces their useful life
  2. batteries only deliver their rated capacity 17 montauk boston whaler when relatively new
  Realistically you’d have to discount the average 17 montauk boston whaler number of Ah delivered by 20%, which would increase the 17 montauk boston whaler cost per Ah in our example to $ 0.005.