Volvo Penta D4 Operator's Manual page 88

Maintenance
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86
• Charge batteries if they have become discharged.
During charging, unscrew the cell plugs but leave
them in the plug holes. Ventilate well, especially if
the batteries are charged in an enclosed space.
• If the engine is not used for a longer period of time,
the batteries should be fully charged, then possibly
trickle charged (please refer to the battery manu-
facturer's recommendations). Batteries are dam-
aged by being left discharged, and can also freeze
and burst easier in cold weather.
• Special instructions apply to boost charging. Boost
charging can shorten battery life, and should there-
fore be avoided.
Electrical Installations
An incorrectly-carried-out electrical installation may
generate leakage current from the electrical system.
Leakage current can in turn render galvanic protection
insufficient in respect of propellers, propeller shafts,
rudder posts, keel etc and may cause damage through
electrochemical corrosion.
WARNING!
Work on the low voltage circuits in the boats should be
done by a person with electrical training or knowledge.
Installation or work on land current equipment must
only be done by a competent electrician, in accordance
with local regulations for mains electricity.
Always consider the following:
1 If shore power is connected it must always be
ground protected ashore, never in the boat. Fur-
thermore, the shore power installation should be
equipped with a ground fault interrupter.
The shore power installation (transformer, inverter,
battery charger etc.) must be designed for marine
use where the high-tension side is galvanically
separated from the low-tension side.
2 Electrical cables must be run and clamped such
that there is no risk of exposure to chafing, damp or
bilge water.
3 Ground protection for radios, navigation instru-
ments, rudder, boarding ladders or other equipment
where separate cables for ground protection are
present, must be clustered to a common ground
connection that is not connected to the engine or
reverser gear.
IMPORTANT!
The engine and reverse gear must never be used
as earth planes.
7748934 04-2008