Green LED Digital Voltmeter 4-100V DC – Clear readings, 5-minute installation, zero hassle
Whether you are monitoring a car battery, a solar panel array, or a LiFePO4 storage system, keeping an eye on your voltage is essential. This digital voltmeter with a bright green LED display provides real-time, accurate readings without putting a strain on your power source. It is designed for a standard 30mm panel cutout and powers up automatically from 3.8V upwards.
Note: This voltmeter is designed exclusively for Direct Current (DC) circuits. Do not use it on AC circuits, as this will cause damage and poses a safety risk.
Why choose this model? (Key Benefits):
- 3-Digit Circular LED Display — The vibrant green light remains clearly visible in direct sunlight or dim workshops, so you never have to strain to read your levels.
- ±1% Accuracy — On a 12V battery, this ensures a maximum error of just 0.12V, providing the precision needed to identify a weak cell.
- 4–100V DC Range — One versatile instrument works across 6V, 12V, 24V, and 48V systems, or solar panels up to 100V, with no adapters required.
- Self-Powered, Under 12mA Consumption — It draws negligible power from the source being measured; a 60Ah battery would lose less than 0.7Ah per day.
- Standard 30mm Mounting Hole — Fits perfectly into any project enclosure, vehicle dashboard, or industrial panel without requiring modifications.
- Durable ABS Housing — Built to withstand vibrations and operating temperatures between -10°C and +65°C, making it ideal for hot vehicle interiors.
Performance and Specifications
The circular display with a 33.8 mm diameter features a 3-digit LED tube that refreshes every ~300ms — fast enough to capture voltage fluctuations during engine start-up or when connecting a load. With an input impedance of over 100KΩ, the device has virtually no impact on the circuit being tested. The included 15 cm lead allows for direct connection without the need for additional wiring in most compact applications.
| Parameter | Detail |
|---|---|
| Measurement Range | 4V – 100V DC |
| Power Supply Range | 4V – 100V DC (self-powered) |
| Minimum Start Voltage | 3.8V |
| Accuracy | ±1% |
| Input Impedance | >100KΩ |
| Operating Current | <12mA |
| Refresh Rate | ~300ms |
| Display | Circular LED, 3-digit, green |
| Housing Material | ABS |
| Device Diameter | 33.8 mm |
| Mounting Hole Diameter | 30.0 mm |
| Cable Length | 15 cm |
| Operating Temperature | -10°C to +65°C |
| Current Type | Direct Current (DC) only |
Package Contents
- 1x Green LED Digital Voltmeter 4-100V DC
- 15 cm connection cable (pre-attached)
Frequently Asked Questions
Does this work with a 12V car battery?
Yes, perfectly. It covers the entire relevant range: from a discharged battery (below 11V) to resting voltage (~12.6V) and charging voltage (~14.4V). It is also suitable for 24V truck systems.
Does it require a separate power supply?
No. It is powered directly by the circuit it is measuring. Simply connect the two wires to your DC source, and the display will turn on automatically from 3.8V upwards — no external batteries or extra power points needed.
What size hole do I need to drill?
Exactly 30 mm in diameter. The 33.8 mm body features a bezel that holds the instrument securely in the panel without needing extra screws.
Can I use this for solar panels or LiFePO4 batteries?
Yes. The range up to 100V makes it compatible with photovoltaic systems, LiFePO4 battery banks in series, and any other DC source within this range. It is one of its most common applications.
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