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    Boat Maintenance Companions: Electrics & Diesel Companions at Sea
    Boat Maintenance Companions: Electrics & Diesel Companions at Sea
    Boat Maintenance Companions: Electrics & Diesel Companions at Sea
    Ebook123 pages30 minutes

    Boat Maintenance Companions: Electrics & Diesel Companions at Sea

    By Pat Manley

    ()

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    About this ebook

    Fernhurst Books' compact, handy guides to boat electrics and diesel engines bundled together in e-book form for the first time. The perfect quick reference guides to keep on your phone or tablet, easily accessible when you are on board. They contain all the essential information for when you need it most about keeping your boat electrics and marine diesel engine running. The Electrics Companion covers formulae, tools, anodes, protection, multimeters, soldering, AC power, testing, wiring, batteries, connections and power consumption. The Diesel Companion details the parts of the engine and has checklists for monthly, weekly and daily checks. It outlines what to do if the engine won't start, or stop, if it overheats or there are problems with the fuel system. It tells you about servicing, the electrics and winterisation. This will be a valued companion when the electrics or engine doesn't behave.
    LanguageEnglish
    PublisherFernhurst Books Limited
    Release dateApr 16, 2024
    ISBN9781912621927
    Boat Maintenance Companions: Electrics & Diesel Companions at Sea
    Author

    Pat Manley

    Pat Manley was a keen sailor and one of Practical Boat Owner magazine’s team of experts, answering readers’ questions. He is author of Fernhurst Books’ Simple Boat Maintenance, Essential Boat Electrics, Diesels Afloat and Practical Navigation.

    Read more from Pat Manley

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      Book preview

      Boat Maintenance Companions - Pat Manley

      Illustration

      CONTENTS

      ELECTRICS

      FORMULAE

      MULTIMETERS

      TESTING

      BATTERIES

      CIRCUIT PROTECTION

      WIRE

      SOLDERING & WIRING

      CONNECTIONS

      FAULTS

      ANODES

      AC POWER

      CHARGING

      POWER CONSUMPTION

      DIESEL

      PARTS OF THE ENGINE

      CHECKLISTS

      ENGINE WON’T START

      ENGINE WON’T STOP

      COOLING

      OVERHEATING

      FUEL SYSTEM

      SERVICING FUEL SYSTEM

      LUBRICATION

      ELECTRICS

      WINTERISATION

      BATTERY

      Illustration

      FORMULAE

      1. Resistance of a wire or component is measured in ohms (Ω).

      2. Volts (V) drives the current through the wire.

      3. Current (I) is the flow of electricity through the wire. It’s measured in amps (A).

      4. Power is the voltage multiplied by the current: Power = V × I watts.

      5. Ohms Law tells us that the current through a wire is calculated by dividing the volts by the resistance. Thus I = V/R and so (V = I × R), (R = V/I).

      6. Voltage drop in a long wire run should not exceed 3%. On many boats the loss is as much as 10%. This gives dim lights and wastes power.

      7. The resistance of several components connected ‘in series’ is the sum of their individual resistances. The same current flows through all of them. The system voltage acts over the complete string of components (R = R1 + R2 + R3 etc).

      8. The resistance of components connected ‘in parallel’ is a little more complex and is found by:

      Illustration

      For only two resistances this is simplified to:

      Illustration

      POWER CONSUMPTION

      • The power consumed by a piece of equipment is measured in amp hours (Ah): the length of time it’s switched on multiplied by the current flowing through it.

      • A 25-watt navigation light has a current of 2.08 amps at 12 volts (power / volts). Switched on for 8 hours it will consume 16.64 amp hours (amps x time).

      ELECTRONICS

      Electronic equipment will normally run on a large voltage range. 9-16 volts or 9-32 volts.

      HEAVY LOAD ITEMS

      Fridges, heaters and other heavy load equipment will often be set to cut out if the voltage drops below a critical level.

      MULTIMETERS

      AUTO-RANGING MULTIMETER

      IllustrationIllustration

      THE MULTIMETER

      Troubleshooting and maintenance of the electrical system is enhanced by the use of a multimeter. These can be purchased for a modest price from electronics stores and for general use an auto-ranging meter is probably most appropriate. With manual multimeters you need to estimate the value before you test it.

      A small probe-type multimeter frees up the hands to allow the circuit to be tested and the meter to be read simultaneously, but will not measure current.

      The meter has an internal battery and so must be switched off when not in use.

      TESTING

      CHECKING CONTINUITY

      Illustration
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