Balmar battery monitor with NMEA interface

The Balmar Battery Monitor with NMEA 2000 Interface (SG230/SG235) offers the same precise battery monitoring as the SG200 family – extended by a direct connection to your existing NMEA 2000 on-board network. Instead of just guessing the voltage, the system provides the actual state of charge and health of your batteries in real-time, directly viewable on the chart plotter or multifunction display at the helm.

Features & Benefits

• Real-time battery State of Charge (SoC%) and State of Health (SoH%)
• Continuous monitoring of charge and discharge current as well as voltage
• Time remaining until empty or full
• History as well as error and warning messages for early fault detection
• Supports lead-acid, lithium (LiFePO4), standard AGM, TPPL-AGM, Carbon-Foam-AGM, and gel for 12V to 48V on-board systems
• NMEA 2000 integration: Battery data directly available in the existing on-board electronics network, e.g., on the multifunction display/plotter
• Self-calibrating accuracy that remains consistent even with increasing battery age
• Expandable SmartLink™ architecture for multiple displays and battery banks

How accurate is the State of Charge display?

After a brief battery learning phase, the N2K SmartShunt automatically calibrates and typically achieves an accuracy of 97%. This precision is maintained throughout the battery's lifespan – a clear advantage over mere voltage displays.

Which version is right for me?

Both versions are structurally identical to the SG200 family (same sensors, same accuracy, same battery technology support), but differ in the display:

• SG230 – Complete package consisting of N2K SmartShunt, NMEA 2000 adapter cable, color display, communication cable, and Bluetooth® gateway. Useful if you want a standalone SmartLink display at the helm or instrument panel in addition to the chart plotter.
• SG235 – like SG230, but without a color display, instead only with a Bluetooth® gateway for app connectivity. The right choice if battery data is already displayed on the chart plotter via NMEA 2000 and you want to do without an additional display.

Technical Data

• Supply voltage: 8V – 60V DC
• Average supply current: Display on 20mA @12V, standby 10mA @12V
• Max. shunt current: 350A continuous, 600A short-term (10 minutes)
• Max. capacity: 1,310 Ah per SmartShunt
• SmartShunt operating temperature: -40°C to +85°C
• Protection class: IP65 (Display), IP67 (SmartShunt)
• Standards: CE EMC Directive 2014/30/EU, RoHS-2 Directive 2011/65/EU
• Up to 32 devices can be combined in one network

Area of Application

This battery monitor is particularly suitable for boats with an existing NMEA 2000 backbone, whose owners want to see battery data centrally on the chart plotter instead of on a separate display. Likewise, sailors and motorboat owners with lithium or AGM battery banks who want to monitor true state of charge and remaining runtime instead of just voltage will benefit – for example, when anchoring, on longer trips, or when operating the refrigerator, autopilot, and navigation electronics.

Make optimal use of your existing NMEA 2000 network and keep an eye on your power consumption centrally on the chart plotter. Choose SG230 or SG235 to match your existing equipment and order today from philippi.