WattNode® Revenue Modbus®

Revenue Grade AC Power Measurement
for Modbus Networks,
True Power, kWh
Reactive Power,
VARs, Power Factor,
Individual Phase Measurements
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WattNode Revenue Modbus

The WattNode Revenue with Modbus interface is a revenue grade kilowatt hour (kWh) energy and power meter that communicates on a EIA RS-485 network, measures 1, 2, or 3 phases with voltages from 120 to 480 volts Vac. When used with Accu-CT Class 0.6 current transformers it meets the accuracy requirements of ANSI C12.1. All WattNode Revenue meters are supplied with a certificate of calibration.

Diagnostic LEDs

Our diagnostic LEDs provide a per-phase indication of power (green flashing) and negative power (red flashing) to help troubleshoot connection problems, like reversed CTs, or excessive line voltage. The WattNode Modbus meter also has a red/yellow/green communication LED to indicate traffic, configuration problems, bus contention and other conditions. See the manual for full descriptions.


  • Supports floating point and integer registers
  • True RMS Power: Watts (Phase A, B, C, and sum of all phases)
  • Reactive Power: VARs (Phase A, B, C, and sum of all phases)
  • Power Factor: (Phase A, B, C, and sum of all phases)
  • True RMS Energy: Kilo-Watthours kWh (Phase A, B, C, and sum of all phases)
  • Reactive Energy: kVAR-hours (All Phases)
  • AC Line Frequency
  • RMS Voltage: (Phase A, B, C)
  • Computed RMS Current: (Phase A, B, C)
  • Demand
  • Peak Demand


  • Meets ANSI C12.1 for use in revenue grade metering
  • CT rated amps value locked and cannot be changed to prevent tampering
  • Small form factor for easy installation inside most electrical panels, see a sample installation diagram
  • Pluggable screw terminals for easy wiring
  • 0.5% accuracy nominal (see manual for details)
  • True RMS power even with leading or lagging power factor and chopped or distorted waveforms
  • Measure variable speed drive pumps and motors
  • Safe 0.333 Vac output revenue grade split-core CTs with outstanding linearity, low 0.5° phase angle error, and accuracy down to 1% of full scale
  • UL, cUL Listed – Designed and tested for safety and use throughout North America.
  • Assembled in USA, qualified under the Buy American provision in the American Recovery and Reinvestment Act of 2009 (ARRA).
  • Five year warranty

Safety Note

Warning: Hazardous Voltages – Only qualified personnel or licensed electricians should install the WattNode meter and current transformers.

Modbus is a registered trademark of Modbus Organization, Inc.

Keywords: C12