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VVM304 - Digital DC Voltage Current Energy Sensor Module 100V 25A with Watt hour, Ampere hour, Serial UART Communication, Over-Current Detection, MODBUS Compatible

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VVM304 100V 25A DC voltage current energy sensor module
  • VVM304 100V 25A DC voltage current energy sensor module

Product Description

The VVM304 is a digital DC voltage, current and energy sensor module for industrial and commercial monitoring. It measures DC voltage up to 100 V and bidirectional DC current up to ±25 A using a WCS1800 Hall effect sensor with a 9.0 mm conductor aperture. Current measurement requires no shunt resistor or break in the measured conductor.

The module measures watt-hours and ampere-hours for energy and battery-capacity monitoring. Analog voltage outputs and UART serial communication support microcontrollers and data acquisition systems. Modbus RTU slave operation requires an external TTL-to-RS485 converter. A 16 × 2 LCD can optionally connect to the 16-pin header. An adjustable over-current threshold, active-low alarm output and calibration modes support system integration.

Applications

Motor Control Solar & Power Systems Battery Charging & Electric Vehicles

Product Specifications

ModelVVM304
Versionv1.3
MeasurementDC voltage, current, power, watt-hour and ampere-hour / coulomb count
Voltage rangeUp to 100 V DC
Current range±25 A DC
Current sensingWCS1800 Hall effect
Auxiliary supply7–12 V DC maximum
DisplayOptional 16 × 2 LCD via 16-pin header; contrast potentiometer
Current output sensitivity66 mV/A
Voltage output sensitivity25 mV/V
Current calculationI (A) = (Iout − 2.5) / 0.066
Conductor aperture9.0 mm diameter
Board dimensions80 × 36 mm (datasheet drawing); mounting-hole spacing 75 × 35 mm
Current-measurement electrical isolation4000 V; voltage-input isolation is not specified
Sensor bandwidth>20 kHz; serial/display update rate not specified
Magnetic hysteresisNearly zero
CommunicationTTL UART Tx/Rx; external TTL-to-RS485 converter required for Modbus RTU
Baud rates9600 (default), 19200, 38400, 57600, 115200
Modbus slave ID1 default; programmable 1–247
Modbus registers40001–40002 voltage; 40003–40004 current; 40005–40006 Wh; 40007–40008 Ah; 32-bit float
Over-current outputO/C LOW on over-current, HIGH otherwise; LED indication
Threshold adjustmentRV1 potentiometer: clockwise increases, anticlockwise decreases
Operating modesVoltage/current; voltage/current/Wh/Ah; over-current setting; zero-current calibration
ConnectionsGND, NC, +12v, Iout, O/C, Tx, Rx, Vout, EN and two-pin VIN
Converter enableEN connects to DE and RE of external TTL-to-RS485 converter
Energy data retentionSend S + Enter to save Wh/Ah; R + Enter resets stored values

Product Features

  1. DC voltage measurement up to 100 V and bidirectional current measurement up to ±25 A
  2. WCS1800 Hall effect current sensing without a shunt resistor
  3. Optional 16 × 2 LCD support via a 16-pin header; UART output for voltage, current, Wh and Ah
  4. Analog current and voltage outputs: 66 mV/A and 25 mV/V
  5. UART serial interface; programmable baud rate from 9600 to 115200
  6. Modbus RTU slave operation via an external TTL-to-RS485 converter
  7. Adjustable over-current threshold with active-low digital output
  8. 9.0 mm conductor aperture; compact board for embedded integration
  9. 4000 V current-measurement isolation; sensor bandwidth >20 kHz
  10. Local push-button calibration and factory reset
  11. Serial commands to save or reset energy counters

Package Includes

  • 1 × VVM304 DC voltage, current and energy sensor module
  • LCD, enclosure, auxiliary power supply and TTL-to-RS485/USB converter are not specified as included.

Frequently Asked Questions

What does VVM304 measure?
DC voltage up to 100 V and bidirectional current up to ±25 A, with watt-hour and ampere-hour measurement. It uses a WCS1800 Hall effect sensor, 9.0 mm conductor aperture and 66 mV/A current output sensitivity.
Is an LCD included?
The module supports an optional 16 × 2 LCD through its 16-pin header. LCD, enclosure, auxiliary supply and interface converters are not specified as included.
How is Modbus RTU supported?
Use an external TTL-to-RS485 converter and connect EN to DE/RE. Default slave ID is 1; IDs 1–247 and baud rates 9600–115200 are supported. Voltage, current, Wh and Ah occupy register pairs 40001–40008 as 32-bit floats.
How are Wh and Ah totals retained?
Send S followed by Enter through the serial port to save totals. Send R followed by Enter to reset stored values. Automatic saving is not specified.
What power supply and isolation are specified?
Use a stable auxiliary 7–12 V DC supply, with 12 V maximum. The 4000 V isolation specification applies to current measurement; voltage-input isolation is not specified. Very low current measurements are less accurate.

Other Information

Applications: test and measurement, instrumentation and control, motor control, power and solar systems, battery chargers, state-of-charge estimation, electric vehicles, load detection and over-current fault detection.

Connect the auxiliary supply to +12v and GND. Observe correct VIN polarity and conductor direction. Analog Vout and Iout signals are outputs. Current measurement is electrically isolated; the datasheet does not specify isolated voltage measurement.

Baud rate and slave ID are configured over the serial port. Modbus mode requires a local button operation and an external TTL-to-RS485 converter; regular UART data output is unavailable while operating in Modbus mode. Remote Configuration Support means seller support availability.

Wh and Ah are retained after power-off when saved with S + Enter. Use R + Enter to reset stored readings. Hall effect sensing is less accurate at very low currents. If the serial port is unused, connect Rx and NC as instructed by the manufacturer. Use a stable, good-quality auxiliary supply.

Warranty Information

1 Year Seller Warranty

This item is covered with a standard warranty of 1 year from the time of delivery against manufacturing defects only. This warranty is given for the benefit of TwoElectrons customers from any kind of manufacturing defects. Replacement will be done against manufacturing defects.

What Voids Warranty

If the product is subject to misuse, tampering, static discharge, accident, water or fire damage, use of chemicals & soldered or altered in any way.

Shipping & Returns Policy

Shipping Policy:
  • In-stock items are delivered within 7-10 working days for orders within India. Delivery varies based on location and courier service.
  • In-stock items are delivered within up to 20 working days for orders outside India. Delivery varies based on location and courier service.
  • If the item is out of stock, you can still place an order. The estimated delivery time will be notified to you by email.
Return & Refund Policy:
  • Return window: 7 days from receipt unless stated otherwise.
  • No refunds or replacements after the return window.
  • Returns are accepted only for non-working or damaged products.
  • Initiate return requests from here: Return Request or contact us at 09831070550.
  • Refunds are processed within 3-4 working days after inspection and approval.
VVM304 - Digital DC Voltage Current Energy Sensor Module 100V 25A with Watt hour, Ampere hour, Serial UART Communication, Over-Current Detection, MODBUS Compatible

Main Features

  • DC voltage measurement up to 100 V and bidirectional current measurement up to ±25 A
  • WCS1800 Hall effect current sensing without a shunt resistor
  • Optional 16 × 2 LCD support via a 16-pin header; UART output for voltage, current, Wh and Ah
  • Analog current and voltage outputs: 66 mV/A and 25 mV/V
  • UART serial interface; programmable baud rate from 9600 to 115200
  • Modbus RTU slave operation via an external TTL-to-RS485 converter
  • Adjustable over-current threshold with active-low digital output
  • 9.0 mm conductor aperture; compact board for embedded integration
  • 4000 V current-measurement isolation; sensor bandwidth >20 kHz
SKU: 2EMK30014
₹ 1,683.00
For bulk orders, volume pricing & B2B enquiries, contact our team →

Lead time

QUANTITY DISPATCH
1-10 units Order from India: 7-10 working days
Order outside India: Up to 20 working days
10+ units To be negotiated
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