Electrical system
37
Connecting batteries
If a boat has more than one battery, observe the fol-
lowing for each connection method:
Parallel connection:
Two (or more) 2V batteries are connected in parallel
so that the capacity is increased. The boat’s system
voltage is the same as the rated voltage of the bat-
tery.
• The batteries must have the same nominal voltage.
• The batteries may have different capacities.
• The batteries do not need to be of the same age.
When two batteries are connected in parallel, the
voltage remains the same but the capacity is the
sum of the capacities. When charged, each battery
receives a charge lower than that stated on the char-
ger. To find out the charge current supplied to each
battery, measure the charging current to each battery
with an ammeter.
Example: When two 2 V batteries each with a capacity of 88 Ah
are connected in parallel, the voltage will be 2 V and the total
capacity 76 Ah.
12V
88Ah
12V
88Ah
12V
176Ah
If one of two batteries connected in parallel has a
short-circuited cell, the nominal system voltage will
be approx. 0 V.
Series connection:
Two 2 V batteries are connected in series so that
the system voltage in the boat is 24 V.
WARNING! Always check the boat’s system
voltage before connecting. A particular engine
type may be available for 2 V and 24 V con-
figurations.
• The batteries must be similar (same capacity and
voltage).
• The batteries must be the same age since the
charge current required to produce a certain volt-
age changes with the age of the battery.
• There must not be unequal loading (equipment
should load both batteries - not just one). A small
load such as a radio connected across only one
battery can quickly destroy the batteries.
Two batteries connected in series retain the capacity
but double the voltage. During charging, each bat-
tery receives the current supplied by the charger. The
total battery voltage must not exceed the battery volt-
age marked on the charger.
When two 2 V batteries are connected in series
and one battery has a short-circuited cell, the rest-
ing voltage across the two batteries will be approx.
23 V.
Example: When two 2 V batteries are connected in series, with a
capacity of 88 Ah, the voltage is 24 V and the capacity 88 Ah.
12V
88Ah
12V
88Ah
24V
88Ah
Содержание D11 series
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