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VVM204 - Digital DC Voltmeter Ammeter Power and Energy Meter 100V 25A with Watt hour, Ampere hour, Serial UART Communication, Over-Current Detection, MODBUS Compatible

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VVM204 manufacturer datasheet illustration of the LCD panel meter; display values are illustrative
  • VVM204 manufacturer datasheet illustration of the LCD panel meter; display values are illustrative

Product Description

The VVM204 is a digital DC voltage, current, power and energy meter 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 does not require a shunt resistor or breaking the measured conductor.

A 16 × 2 LCD displays readings, with watt-hour and ampere-hour measurement for energy and battery-capacity monitoring. Analog voltage outputs and serial UART communication support integration with microcontrollers and data acquisition systems. Modbus RTU slave operation requires an external TTL-to-RS485 converter. The meter includes an adjustable over-current threshold, active-low alarm output, calibration modes and a 48 × 96 mm DIN panel enclosure.

Applications

Motor Control Solar & Power Systems Battery Charging & Electric Vehicles

Product Specifications

ModelVVM204
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
Display16 × 2 LCD
Current output sensitivity66 mV/A
Voltage output sensitivity25 mV/V
Current calculationI (A) = (Iout − 2.5) / 0.066
Conductor aperture9.0 mm diameter
Panel enclosure48 × 96 mm; depth 55 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. 16 × 2 LCD for voltage, current, power, watt-hour and ampere-hour readings
  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; 48 × 96 mm DIN panel enclosure, 55 mm depth
  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 × VVM204 DC voltage, current, power and energy meter in DIN panel enclosure
  • External supply and TTL-to-RS485/USB converter are not specified as included.

Frequently Asked Questions

What voltage and current can the VVM204 measure?
It measures DC voltage up to 100 V and bidirectional DC current up to ±25 A. The WCS1800 Hall effect sensor measures current through a 9.0 mm aperture without a shunt resistor. Current sensing is less accurate at very low currents.
What power supply does the VVM204 require?
Use a stable 7–12 V DC auxiliary supply connected to +12v and GND. The 100 V measurement rating applies to VIN, not the auxiliary power input. Observe VIN polarity. The datasheet specifies 4000 V isolation for current measurement; it does not specify voltage-input isolation.
Does it support UART and Modbus RTU?
Yes. UART is available on Tx/Rx, with 9600 baud by default and selectable rates up to 115200. Modbus RTU slave operation requires an external TTL-to-RS485 converter, with EN connected to the converter's DE and RE pins. Slave IDs 1–247 are supported; the default is 1. Regular UART data output is unavailable while in Modbus mode.
Are watt-hour and ampere-hour readings retained after power-off?
Send S followed by Enter through the serial port to save Wh and Ah values in device memory before power-off. Send R followed by Enter to reset the stored readings to zero.
How is the over-current alarm adjusted?
Select the over-current setting mode using the push button and adjust RV1. Turning it clockwise increases the threshold; anticlockwise decreases it. On over-current, the O/C digital output goes LOW and LED L2 illuminates. Zero-current calibration is available in Mode 4 with no current flowing through the sensor.

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.
VVM204 - Digital DC Voltmeter Ammeter Power and Energy Meter 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
  • 16 × 2 LCD for voltage, current, power, watt-hour and ampere-hour readings
  • 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; 48 × 96 mm DIN panel enclosure, 55 mm depth
  • 4000 V current-measurement isolation; sensor bandwidth >20 kHz
SKU: 2EMK30010
₹ 2,244.00
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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