Skip to product information
Home / Makers Kit / Custom Development / VVM203 - Digital DC Voltmeter Ammeter Power and Energy Meter 100V 50A with Watt hour, Ampere hour, Serial UART Communication, Over-Current Detection, MODBUS Compatible

VVM203 - Digital DC Voltmeter Ammeter Power and Energy Meter 100V 50A with Watt hour, Ampere hour, Serial UART Communication, Over-Current Detection, MODBUS Compatible

No reviews yet
Expert Consultation
Book now → Remote Configuration
Get support → Onsite Deployment
Send email → Knowledge Video
Send email →
Low Stock, 1 left
VVM203 100V 50A DC power energy meter with LCD display
  • VVM203 100V 50A DC power energy meter with LCD display

Product Description

The VVM203 is a digital DC voltage, current, power and energy meter for industrial and commercial monitoring. It measures DC voltage up to 100 V and current up to ±50 A using a WCS1700 Hall effect sensor, with watt-hour and ampere-hour measurement for energy and battery-capacity monitoring.

A 16 × 2 LCD provides local readings, while analog voltage/current outputs and a serial UART interface support integration with microcontrollers and data acquisition systems. Adjustable over-current detection provides an active-low digital output. Modbus RTU slave operation requires an external TTL-to-RS485 converter.

The meter uses a 48 × 96 mm DIN panel enclosure with 55 mm depth and a 9.0 mm conductor aperture. Auxiliary power is 7–12 V DC maximum. The specified 4000 V isolation applies to current measurement; voltage-input isolation is not specified.

Applications

Motor Control Solar & Power Systems Battery Charging & Electric Vehicles

Product Specifications

Model / versionVVM203 / v1.3
DC voltage rangeUp to 100 V
DC current range±50 A
Current sensorWCS1700 Hall effect
Current output sensitivity33 mV/A
Current calculationI (A) = (Iout − 2.5) / 0.033
Voltage output sensitivity25 mV/V
Energy / capacityWatt-hours / ampere-hours (coulomb counting)
Auxiliary supply7–12 V DC; maximum 12 V
Display16 × 2 LCD
Enclosure dimensions48 × 96 mm DIN panel; depth 55 mm
Conductor aperture9.0 mm diameter
Current-measurement isolation4000 V; voltage-input isolation not specified
Sensor bandwidth>20 kHz
Magnetic hysteresisNearly zero
Serial interfaceUART Tx output / Rx input
Baud rates9600 default; 19200, 38400, 57600, 115200
ModbusRTU slave; external TTL-to-RS485 converter required
Slave addresses1–247; default 1
Modbus registersVoltage: 40001–40002; current: 40003–40004; Wh: 40005–40006; Ah: 40007–40008; each 32-bit float
Over-current outputLOW on over-current; HIGH otherwise
Converter enableEN connects to DE/RE of TTL-to-RS485 converter
Display modesVoltage/current; voltage/current/Wh/Ah; over-current setting; zero calibration
Store / reset totalsSerial S + Enter saves; R + Enter resets Wh/Ah
CalibrationZero-current and current/voltage calibration supported
Low-current limitationHall effect sensing is less accurate at very low currents

Product Features

  1. DC voltage measurement up to 100 V; DC current range ±50 A
  2. WCS1700 Hall effect current sensing without shunt resistor or wire break
  3. Power, watt-hour and ampere-hour measurement
  4. 16 × 2 LCD with selectable display modes
  5. Analog current and voltage outputs plus serial UART
  6. Programmable UART baud rates: 9600–115200
  7. Modbus RTU slave via external TTL-to-RS485 converter
  8. Adjustable over-current threshold and active-low O/C output
  9. 4000 V current-measurement isolation
  10. 48 × 96 × 55 mm DIN panel enclosure; 9.0 mm current aperture
  11. Push-button operation for display modes, calibration and serial/Modbus mode selection.
  12. Serial commands support baud-rate changes, slave-ID changes and saved Wh/Ah totals.

Package Includes

  • 1 × VVM203 DC meter assembly with 16 × 2 LCD and DIN panel enclosure
  • Power supply, USB-to-TTL and TTL-to-RS485 converters are not specified as included.

Frequently Asked Questions

What does VVM203 measure?
DC voltage up to 100 V, current up to ±50 A, power, watt-hours and ampere-hours. It uses a WCS1700 Hall effect sensor with a 9.0 mm conductor aperture and 33 mV/A current output sensitivity.
What supply and enclosure does it use?
Use a stable auxiliary 7–12 V DC supply, with 12 V maximum. The DIN panel enclosure measures 48 × 96 × 55 mm and includes a 16 × 2 LCD.
How do I connect it to Modbus RTU?
Use an external TTL-to-RS485 converter; connect EN to DE/RE. The default slave ID is 1; IDs 1–247 are supported. Baud rates are 9600, 19200, 38400, 57600 and 115200. Voltage registers are 40001–40002, current 40003–40004, Wh 40005–40006 and Ah 40007–40008, each a 32-bit float.
Are Wh and Ah totals retained after power-off?
Send S followed by Enter through the serial port to save totals to memory. Send R followed by Enter to reset stored totals. Automatic saving is not specified.
How do over-current detection and calibration work?
Adjust RV1 in over-current setting mode. O/C goes LOW and LED L2 lights on over-current. Perform zero calibration with no current flowing. Very low current readings are less accurate. The 4000 V isolation specification applies to current measurement; voltage-input isolation is not specified.

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.

Apply a stable auxiliary 7–12 V DC supply to +12v and GND; 12 V is the maximum. Observe VIN polarity and the current-direction arrow on the sensor. If the serial port is unused, the manufacturer instructs connecting Rx and NC together to avoid random display errors. Save Wh/Ah explicitly using S followed by Enter for retention after power-off. Modbus operation requires an external TTL-to-RS485 converter and replaces regular serial streaming. Follow the manufacturer instructions for mode switching and calibration. Current sensing is less accurate at very low currents. The 4000 V isolation specification applies to current measurement; voltage-input isolation, environmental ratings and accuracy tolerances are not specified.

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.
VVM203 - Digital DC Voltmeter Ammeter Power and Energy Meter 100V 50A with Watt hour, Ampere hour, Serial UART Communication, Over-Current Detection, MODBUS Compatible

Main Features

  • DC voltage measurement up to 100 V; DC current range ±50 A
  • WCS1700 Hall effect current sensing without shunt resistor or wire break
  • Power, watt-hour and ampere-hour measurement
  • 16 × 2 LCD with selectable display modes
  • Analog current and voltage outputs plus serial UART
  • Programmable UART baud rates: 9600–115200
  • Modbus RTU slave via external TTL-to-RS485 converter
  • Adjustable over-current threshold and active-low O/C output
  • 4000 V current-measurement isolation
  • 48 × 96 × 55 mm DIN panel enclosure; 9.0 mm current aperture
SKU: 2EMK30009
₹ 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
Icon
Need Support?
Click here
Icon
Free delivery above ₹5,000
Icon
1 year product warranty
Icon
Secure payment options
Protections for this product
Delivery
Delivery via TwoElectrons Logistics

We aim to deliver your order within the scheduled dates, but delays may occur due to unforeseen circumstances.

Security
Secure Payments

Your payment information is safe with us. TwoElectrons.com uses SSL encryption to ensure secure and reliable transactions.

Security
Standard Refund Policy

You're covered! If your order doesn't ship, arrives incomplete, or has any product issues, you can claim a full refund.

TwoElectrons.com protects all your orders placed and paid on the platform with secure Razorpay Payment Gateway.