CHAPTER 6
6-22
Digital Voltage Sensitive Relay (DVSR)
Note the DVSR located next to the battery
switch in the center of the battery manage-
ment panel. The purpose of the DVSR is to
protect the battery circuit from being dis-
charged. Also, when the engine battery is fully
charged it can send current to the house bat-
tery.
Note that at mooring when activated the battery charger sends current
to the appropriate battery “on demand” and the DVSR’s are more or
less idle. At sea, the DVSR system sends needed battery current via
the engine alternator charging circuit to the appropriate battery.
When the engine cranking battery rises above 13.7 volts DC the DVSR
switches to charge (cranking and house) both batteries simultaneous-
ly. If battery voltage drops to 12.8 volts DC the DVSR disengages.
This DVSR capability is known as “dual sense” technology. It per-
mits the DVSR to sense the voltage of all batteries that the unit is
connected between. If one of the batteries is receiving a charge the
DVSR will close by paralleling both battery banks to charge the house
battery along with the engine cranking battery.
If the DVSR senses the engine battery is being discharged at a fast
rate it will open and will not allow that battery to be overly discharged
to the point that the engine will not crank.
An example of the above situation would be if the vessel was station-
ary at sea for an extended period with various electronic and enter-
tainment equipment components energized along with the engine off
the battery(ies) will discharge.
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