bayite DC 6.5-100V 0-100A LCD Digital Multimeter (Model PZEM-051) Instruction Manual

1. Introduction and Overview

This manual provides detailed instructions for the installation, operation, and maintenance of your bayite DC 6.5-100V 0-100A LCD Digital Multimeter, Model PZEM-051. This 4-in-1 meter is designed to simultaneously display voltage, current, active power, and energy, making it an essential tool for monitoring DC power systems.

Key features include:

Wide test range: Voltage: DC 6.5~100V; Current: 0~100A; Power: 0~10kW; Energy: 0~9999kWh.
Energy data storage: Retains energy readings when power is off (can be reset to 0).
Adjustable backlight: The blue backlight can be manually turned on or off.
Overload alarm function: Backlight and power value will flash if active power exceeds a set threshold.

2. Package Contents

Upon opening the package, you should find the following items:

1x DC 6.5-100V 100A Power Multimeter
1x 100A Current Shunt

Note: The wire harness is NOT included and must be supplied by the user.

bayite DC Digital Multimeter and 100A Current Shunt — Image 2.1: The bayite DC Digital Multimeter and the accompanying 100A Current Shunt. The package includes these two main components, but no wiring.

3. Specifications

Specification	Value
Working Voltage	DC 6.5 ~ 100V
Measuring Accuracy	1%
Power Consumption	0.2W
Measurement Speed	2 times/s
Active Power Test Range	0~10kW
Energy Test Range	0~9999kWh
Voltage Test Range	DC 6.5~100V
Current Test Range	0~100A
Recommended Cutout Dimensions (L x W x H)	3.33 x 1.75 x 0.96 inches
Item Weight	7.04 Ounces
Model Number	PZEM-051
Certifications	CE, RoHS, UL

4. Setup and Installation

Proper wiring is essential for accurate readings and safe operation. Please follow the diagrams and instructions carefully.

4.1 Basic Wiring Instruction

The meter requires a 100A current shunt for current measurement. The shunt must be placed in the negative line of the DC circuit. Connect the meter to the shunt and the power source as shown in the diagram below.

Wiring diagram for bayite DC Digital Multimeter showing shunt placement and meter connections — Image 4.1: Basic wiring diagram for the DC Digital Multimeter. Step 1 shows shunt placement (Type A: between power and load, Type B: between load and ground). Step 2 illustrates connecting the meter with four wires to the shunt and power source. Note that wires are not included, and 30AWG-12AWG copper wires are suitable.

Important Notes for Wiring:

No wires are included with the product.
The shunt CANNOT be placed on the positive side of the circuit.
Connect the blue and red lines first, then the yellow and black lines.
Ensure the shunt is not in the positive line when connecting to a DC-AC inverter.
For accurate current readings, connect a simple battery-shunt-load circuit to test the meter first.

4.2 Solar System Wiring Instruction

For solar systems where an inverter connects directly to the battery, multiple meters can be used to monitor different aspects of the system. The diagram below illustrates a setup with four meters.

Solar system wiring diagram with multiple bayite DC Digital Multimeters — Image 4.2: Solar system wiring diagram. Meter #1 monitors solar power production, Meter #2 monitors charging performance, Meter #3 monitors discharging performance, and Meter #4 measures load usage. This setup allows for comprehensive monitoring of a solar power system with an inverter.

4.3 RV Battery Monitoring

The meter can also be integrated into RV battery systems to monitor charging and discharging performance. The diagram below shows how to wire the meter for this application.

RV battery monitoring wiring diagram for bayite DC Digital Multimeter — Image 4.3: Wiring diagram for monitoring an RV battery. It shows connections for measuring discharging power (Meter #3) and charging power (Meter #2). If monitoring both, two meters can be wired on one shunt. Ensure all load negatives are connected on the other side of the shunt to accurately capture all discharging loads.

4.4 Installation Video Guide

For a visual guide on unboxing and wiring the meter, please refer to the video below:

Video 4.4: This video provides an unboxing and overview of the bayite DC 6.5-100V 0-100A LCD Digital Multimeter, demonstrating its components and basic wiring principles. It highlights the meter and shunt, and explains how to connect them for various measurements.

5. Operating Instructions

Once properly installed, the meter will display real-time readings for voltage, current, active power, and energy on its LCD screen.

5.1 Backlight Control

The blue backlight can be manually toggled on or off using the button on the front of the meter. The meter will remember the last backlight setting when powered off and on.

bayite DC Digital Multimeter display with backlight on — Image 5.1: The bayite DC Digital Multimeter displaying voltage, current, power, and energy with its blue backlight illuminated. The backlight can be turned on or off as needed.

5.2 Overload Alarm Function

If the active power exceeds a pre-set threshold, the meter's backlight and the power value displayed will flash to alert the user of an overload condition.

5.3 Monitoring Solar Systems

The meter provides clear insights into solar system performance. Observe the readings to understand power generation, consumption, and battery status.

Solar system monitoring display when solar power is insufficient — Image 5.2: Example of solar system monitoring when solar power is not sufficient. The display shows solar panels supplying 373W, batteries supplying 328.6W, and the load (inverter) using 715.9W. This indicates the system is drawing power from the batteries to meet demand.

Solar system monitoring display when solar power is sufficient — Image 5.3: Example of solar system monitoring when solar power is sufficient. The display shows solar panels supplying 510.9W, 17.7W used by the load, and 496.1W charged into the batteries. This indicates the system is generating more power than consumed, with the surplus charging the batteries.

6. Maintenance

6.1 Shunt Calibration

The current shunt is designed for accurate calibration. Small cuts on the shunt are normal and are part of the manufacturing process to calibrate its resistance. These are not defects.

Close-up of a 100A current shunt showing normal calibration cuts — Image 6.1: A close-up view of the 100A current shunt. The small cuts visible on the shunt are intentional and are made during the manufacturing process for accurate calibration of the shunt's resistance. They do not indicate damage or a faulty product.

7. Troubleshooting

If you encounter issues with your meter, refer to the following common problems and solutions:

Display shows '888s' or incorrect readings: Ensure the shunt is correctly wired in the negative line of the circuit. Verify that the rated current of the DC power source is higher than the load draws. Incorrect wiring is a common cause for this issue.
Screen keeps flashing when voltage is over a certain value: This indicates the voltage alarm function is active. You may have changed the default voltage alarm setting. Refer to the manual for adjusting alarm thresholds.
Current reading is zero: This is often caused by interference from the load. Check all wiring connections for proper contact and ensure the shunt is correctly installed.
No display: Verify that the working voltage (DC 6.5~100V) is supplied to the meter. Check all power connections.

For further assistance, please ensure your wiring matches the diagrams provided in Section 4.

8. Safety Precautions

This module is only suitable for DC 6.5~100V power. Do not use with AC power or voltages outside this range.
The applied load should not exceed the rated power of the meter (10kW) or the shunt (100A).
Wiring order is critical and must be followed precisely as shown in the diagrams. Incorrect wiring can damage the device or pose a safety risk.
This module is suitable for indoor applications only. Do not use outdoors or in environments exposed to moisture or extreme temperatures.
Do not connect the shunt at the positive side of the circuit.

9. Support

Technical support is available 7 days a week. If you have any questions or require further assistance, please contact bayite customer service.

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bayite PZEM-051