DC 7-55V Voltmeter Voltage Tester LED Indicator Light 3S-12S

Monitor your battery's voltage and remaining capacity at a glance with this compact LED voltmeter indicator. Designed for lithium-ion (3S-12S), lithium iron phosphate (3S-14S), and acid batteries (12V/24V/36V/48V), it displays real-time voltage on a bright LED digit screen. Features customizable high/low voltage thresholds, adjustable backlight timer, and power-off memory. Perfect for electric vehicles, solar energy storage, RVs, golf carts, Lead-acid battery monitor and industrial battery monitoring.

Customizable High/Low Voltage Settings

• Low voltage alert: Warns before battery reaches damaging discharge level
• High voltage alert: Warns before over-charging

Example for a 12V lead-acid battery:

• Set low alert at 11.5V (warning before deep discharge)
• Set high alert at 14.5V (warning during charging)

Example for a 48V lithium-ion battery:

• Set low alert at 42V (typical cutoff)
• Set high alert at 54.6V (full charge for 13S)
• Adjustable Backlight Timer – Energy Saving

The built-in backlight timer lets you set how long the display stays illuminated after last operation:

• Energy saving: Reduces power draw when display not needed
• Extended lifespan: Less continuous operation of LED display
• Customizable: Set duration to match your preference and ambient light
• Power-Off Memory – Settings Survive Power Loss

Accidental power disconnection? No problem. The voltmeter automatically saves:

• Current power information
• High/low voltage threshold settings
• Backlight timer settings
• Battery type configuration
• When power returns, your settings are exactly as you left them.
• Low Power Consumption – Won't Drain Your Battery

With working current ≤20mA, this voltmeter consumes minimal power:

• Battery Type: Estimated Daily Drain Impact
• 12V 20Ah: ~0.5% per day Negligible
• 48V 100Ah: ~0.1% per day Virtually zero
• You can leave it connected permanently without worrying about significant battery drain.

3S-12S battery voltage tester Application:

1. Electric bike / scooterLithium-ion 36V/48VMonitor remaining range, prevent deep discharge
2. Golf cart Lead-acid 36V/48V Track charge status across multiple batteries
3. Solar energy storage LiFePO4 12V-48V Monitor charge/discharge cycles
4. RV / camper Lead-acid or lithiumKnow house battery status at a glance
5. Industrial equipment Various Prevent unexpected shutdowns during critical operations
6. Electric wheelchair 12V-24V acid or lithium Ensure sufficient charge for mobility
7. DIY battery pack Any 7-55V Monitor custom-built battery systems
8. UPS / backup power Lead-acid Verify battery health and charge level

Lithium-ion battery capacity display Specification:

1. Voltage Range: (Green/Blue) DC 7-55V
2. Voltage Range: (Red)DC 7-40V
3. Working Current: ≤20mA
4. Display Type: LED digit screen
5. Display Colors: Red, Green, Blue (optional)
6. Lithium-ion (Ternary): 3S ~ 12S
7. Lithium Iron Phosphate: 3S ~ 14S
8. Acid Battery: 12V / 24V / 36V / 48V
9. Default Mode: Ternary lithium L03S (L03) on first power-on
10. Product Size: 46 × 15 × 3 mm

Key Features:

1. Real-Time LED Display: High-brightness LED digit screen shows voltage and remaining battery capacity clearly – readable in various lighting conditions.
2. Wide Voltage Range: Green/blue display models measure DC 7-55V; red display measures DC 7-40V. Compatible with most common battery systems.
3. Multi-Battery Compatibility: Supports lithium-ion ternary (3S-12S), lithium iron phosphate (3S-14S), and acid batteries (12V, 24V, 36V, 48V).
4. Customizable Alerts: Freely set high and low voltage thresholds according to your application and preferences.
5. Adjustable Backlight Timer: Built-in setting allows you to adjust backlight duration – saves power and extends display life.
6. Power-Off Memory: Automatically saves current power information and important settings even after accidental power loss.
7. Low Power Consumption: Operates at ≤20mA working current – minimal drain on your battery.
8. Compact Size: Tiny 46×15×3mm board fits easily into tight spaces, control panels, or battery boxes.

Installation Tips:

1. Placement: Mount where visible during normal operation (dashboard, control panel, battery box exterior).
2. Wiring: Use appropriate gauge wire for your current (meter draws ≤20mA, so thin wire is fine).
3. Polarity: Reverse polarity may damage the meter – double-check connections before powering on.
4. Fusing: Add a small fuse (e.g., 0.5A) on the positive lead for protection.
5. Weather protection: If used outdoors, mount inside a weather-resistant enclosure (board is not waterproof).