Yacht Devices YDBM-02N NMEA 2000 Battery Monitor with Positive or Negative Shunt Connection, 5–2500 A

Yacht Devices YDBM-02N NMEA 2000 Battery Monitor with Positive or Negative Shunt Connection, 5–2500 A

The Yacht Devices YDBM-02N is a marine battery and DC circuit monitoring device designed to report measured voltage and current, calculated battery condition data and user-configured battery information to an NMEA 2000 network.

The device is primarily intended for vessel battery monitoring, but it can also be used with a single DC source or load, including alternators, wind generators, windlasses and refrigerators. An appropriate external shunt is required for current measurement and is not supplied with the device.

Main Features

• Measures DC voltage and bidirectional current
• Reports measured and calculated battery data to NMEA 2000
• Supports battery State of Charge and State of Health monitoring
• Can be used with a single battery, DC source or DC load
• Supports external shunts rated from 5 to 2500 A
• Recommended external shunt nominal voltage drop of 75 mV
• Supports shunt installation on either the positive or negative battery terminal
• MicroSD card slot for configuration and firmware updates
• Supports configuration over NMEA 2000 using installation description strings
• Supports NMEA 2000 digital switching and alarm functions

YDBM-02 Improvement over YDBM-01

The YDBM-02 model includes an additional wire that allows the external shunt to be installed on either the positive or negative battery terminal. This is the main functional difference from the previous YDBM-01 model, and the YDBM-02 can be used as a replacement for the earlier version.

Electrical Specifications

External Shunt

An external shunt is required for current measurement and is not supplied with the YDBM-02N. The device supports shunts with rated currents from 5 to 2500 A, with a recommended nominal voltage drop of 75 mV.

The stated current measurement accuracy does not include the accuracy of the external shunt. Typical shunt accuracy is ±0.25% or ±0.5%, with temperature drift of approximately ±20 to ±25 ppm/°C.

Battery and DC Monitoring

• Measured voltage
• Measured current
• Calculated battery State of Charge
• Calculated battery State of Health
• User-programmed nominal battery capacity
• User-programmed nominal voltage
• User-programmed battery chemistry
• Battery temperature data from a compatible NMEA 2000 thermometer

For improved charge state and battery health calculations, the YDBM-02N can use temperature data from an NMEA 2000 thermometer installed on the monitored battery.

NMEA 2000 Digital Switching

The Battery Monitor can be configured to manage channels of an NMEA 2000 digital switching system and to trigger compatible alarm equipment using standard NMEA 2000 PGNs 127501 and 127502.

• Low battery charge alarms
• Sound or voice alerts through compatible alarm equipment
• Automatic switching of connected equipment
• Automatic genset start for battery recharging

Configuration and Firmware Updates

The YDBM-02N incorporates a MicroSD card slot that can be used with a standard FAT-formatted card for device configuration and firmware updates.

At minimum, the external shunt voltage drop and maximum current must be configured. Additional battery settings can include nominal capacity, nominal voltage and battery chemistry.

The device can also be configured over NMEA 2000 using installation description strings. This method may require a PC gateway and compatible software such as CAN Log Viewer or ActiSense NMEA Reader.

Applications

• Marine battery monitoring
• Alternator monitoring
• Wind generator monitoring
• DC load monitoring
• Windlass circuit monitoring
• Refrigerator circuit monitoring
• NMEA 2000 alarm and digital switching integration