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TECHNICAL TERMS

“Oyster aims to provide the best customer

service in the industry. This is only possible

if its key suppliers have similar aims and

can provide the service and support that

Oyster owners have become accustomed to.

Mastervolt has always displayed the right

dedication to service, supporting Oyster yachts

around the world. Mastervolt is willing to go

that extra mile to provide the service and

support which set Oyster apart.”

PETER INGRAM, TECHNICAL MANAGER

OYSTER YACHTS, UNITED KINGDOM

QUOTE

n

Volt-amps (VA)

Unit for measuring electrical power.

n

Voltage ripple

A voltage ripple is a small alternating current on top

of a direct current, which results in a DC voltage that

is not entirely smooth but ripples slightly.

While a battery delivers pure direct current without

any ripple, this is not always the case with a battery

charger. In an old-fashioned battery charger,

50 % of the voltage will contain ripples.

A large voltage ripple shortens the lifespan of a

battery, which needs to be charged with direct

(not alternating) current. In addition, a voltage

ripple can interfere with onboard audio, navigation

and communications systems. Mastervolt battery

chargers supply a flat DC voltage with no more than

0.3 % of ripple voltage.

n

Watt (W)

Unit that measures the rate of energy,

calculated by multiplying volts by amps.

n

Watt-hour (Wh)

Measure of electrical power in time. One watt-hour

of electricity is equal to one watt of power consumed

over one hour. A 10-watt light bulb uses 10 watt-

hours of electricity in one hour (see also kWh).

W

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