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DREAM CATCHER OPERATING MANUAL
NW Explorations
4G2: DC Batteries
The batteries on this boat are not just one, big all-purpose battery. To have
redundancy, there are actually several “banks” of batteries assigned different tasks.
A “starting bank” is used for starting engines. This battery is charged by the engine
alternator when running, or by the McCarron battery charger if it is on when there is
shore power or a generator is running.
Another “house bank” consists of deep cycle batteries wired in parallel. These
batteries are charged by the engine alternators and by the Inverter when AC power is
present from shore power or a generator.
In the event of a low engine-starting bank, the operator can (1) start a generator
which can then run the chargers or (2) operate the battery-parallel switch (see
below).
Note: If it takes more than two attempts to start any engine, turn off its sea water
valve to avoid water-locking the engine until it starts. Then be sure to immediately
turn it back on after the engine is started!
Two more smaller batteries start each generator. Each of these is charged by the
generator to which it is connected, and by the Newmar charger.
What redundancy!
4G3: DC Battery Chargers
The vessel is equipped with two 12-volt battery chargers. One of these, a Newmar
unit, charges the two genset batteries. The other, McCarron charger, charges the
starting battery.
The Inverter is also a 12-volt charger. It charges the house battery bank.
The chargers are switched on by breakers in the 120-volt circuit breaker panel.
Only the Inverter charger is normally used! Note: The Inverter is primarily used for
house
battery charging; see discussion about the
inverter below!
The E/R boxes holding some of the
batteries are visible in this picture
to port of the port engine.
Notice the batteries in each lower corner
of the 20kw generator area: These are
the starting batteries for each generator.
Red arrow points to McCarron
charger; yellow arrow points to
the Trace Inverter.
Newmar charger in starboard
side of engineroom.