USB Car Voltmeter Panel – Monitor Your Battery & Charge Devices Simultaneously

Stay in control of your vehicle's power with this compact USB 5V 2.4A Car Voltmeter Voltage Meter Panel. Compatible with 12V–24V systems and 3S–7S lithium battery packs, this dual-function panel lets you monitor real-time battery voltage while keeping your devices charged — all from a single, easy-to-install unit. Available in 4 color options to match your setup.

Key Features

Wide Voltage Range: Supports 12V–24V DC input, compatible with 3S–7S lithium, Li-ion, and lead-acid battery systems
USB Fast Charging: Outputs 5V / 2.4A via USB — enough to rapidly charge smartphones, tablets, and other devices
High Conversion Efficiency: Synchronous circuit design achieves up to 96% USB transmission efficiency, minimizing energy loss
Real-Time Voltage Display: Built-in digital voltmeter gives you an instant, accurate read of your battery status
Low Quiescent Current: Electric input current of just 5–25mA; consumption decreases as battery voltage lowers, protecting your battery when idle
Panel-Mount Design: Compact 45mm form factor fits neatly into dashboards, DIY enclosures, RVs, boats, and custom battery builds
4 Color Options: Choose the style that suits your build
Plug-and-Play: No complex configuration needed — ready to install and use straight out of the box

Specifications

Input Voltage: 12V–24V DC (3S–7S Lithium / Li-ion / Lead-Acid)
USB Output: 5V / 2.4A
Conversion Efficiency: Up to 96%
Quiescent Current: 5–25mA
Panel Cutout Size: 45mm
Display: Digital voltage meter

Perfect For

Cars, trucks, SUVs, and motorcycles
RVs, campervans, and marine/boat applications
Solar power storage systems
DIY lithium battery packs and power banks
Off-grid and backup power builds

Learn More About Electrical Safety

For guidelines on safe vehicle electrical modifications and component installation, visit the U.S. Consumer Product Safety Commission (CPSC).

Frequently Asked Questions

Q: What battery types is this voltmeter panel compatible with?

A: This USB car voltmeter panel supports 12V–24V DC input systems, making it compatible with 3S–7S lithium, Li-ion, and lead-acid battery configurations. It's ideal for automotive, marine, RV, and DIY power pack applications.

Q: How efficient is the USB charging output on this panel?

A: Thanks to its synchronous circuit design, the USB output achieves up to 96% transmission efficiency at 5V / 2.4A. This means minimal energy is lost during charging, making it one of the more efficient panel-mount USB chargers available.

Q: Will this panel drain my battery when not in use?

A: The panel draws a very low quiescent current of just 5–25mA, and this draw decreases as battery voltage lowers. This design helps protect your battery during idle periods and is well-suited for always-on monitoring installations.

Q: How do I install this voltmeter panel in my vehicle or build?

A: The panel features a 45mm cutout mounting format, making it straightforward to install into a dashboard, enclosure, or DIY project. Simply connect it to your 12V–24V power source according to the polarity markings — no special configuration is required.

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