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Battery Temperature Sensor
When used in conjunction with the optional MC-TS-B Battery Temperature Sensor, the Digital Duo Charge can automatically
respond to a potential battery thermal runaway by discontinuing charging output to the starting battery — adding a level of safety
to the charging system. To install the MC-TS-B Battery Temperature Sensor:
1. Attach the lug that houses the sensor module to the negative post of the starting battery.
2. Using care to match polarity between the temperature sensor positive and negative wires and the positive and negative
temperature sensor terminal pins on the Digital Duo Charge, connect wires to the terminal pins.
Solenoid Drive
In applications where the Digital Duo Charge is used to support larger capacity starting batteries (such as 4D and 8D models) or
windlass and/or thruster batteries, there may be instances when the 30-amp capacity of the Digital Duo Charge’s circuitry may
not provide sufficient current to satisfy demands. When used as a standalone charge source, the Duo Charge is designed to
discontinue charging when demands exceed its capabilities. At that point, the Digital Duo Charge will wait for a short period and
query if the demand has diminished to below its 30-amp capacity. If so, the Digital Duo Charge will continue charging. If demand
continues to exceed capacity, the Digital Duo Charge will continue to shut down, while periodically checking to see if demand has
diminished.
If your application requires frequent charging levels in excess of 30 amps, it may be necessary to add a solenoid as a method to
manually bypass the Digital Duo Charge’s internal circuitry. Keep in mind, the Digital Duo Charge will not automatically activate
the solenoid if the demand exceeds its capacity. As such, it is important to monitor charging voltage closely at the battery being
charged by the Digital Duo Charge. To utilize the Digital Duo Charge’s solenoid drive function, it will be necessary for the user to
supply an appropriate-capacity solenoid and a toggle or other ON/OFF
switching mechanism to control the bypass function.
To install the external solenoid control circuit:
1. Install solenoid between primary and secondary battery banks.
Ensure that solenoid is properly sized to handle maximum current
flow. Ensure that wire gauge is adequate to supply maximum
current flow.
2. Connect positive solenoid relay terminal to a source of positive
system voltage.
3. Connect the negative solenoid relay to the Solenoid Drive terminal
on the Digital Duo Charge.
4. Create a switched circuit between system ground and the Auto/
Manual terminal on the Digital Duo Charge.
Once installed, the Duo Charge will be in the Auto mode whenever the
toggle switch is in the OFF position, and charging will occur via the
Digital Duo Charge’s internal circuitry. When the toggle switch is in the
ON position, the Duo Charge will revert to manual mode, allowing the
solenoid to control charge flow to the secondary battery bank.
Ground Bus
AUT
O/MANU
AL
SOLENOID DRIVE
ON
TO HOUSE BATTERY
TO START BATTERY
TO BATTERY
V
