TIANWIDJEW 2-Pack 3-Port 12V Surface-Mount USB Charger Panels — Dual USB-C 30W, Built-in Voltmeter

Two surface-mount 3-port 12V charging panels by TIANWIDJEW: dual USB-C PD 30W plus a QC 18W USB-A port, built-in voltmeter and a push-button power switch for vehicles and boats.

This compact 2-pack replaces a cigarette-lighter socket with a slim, surface-mounted charger panel that fits into tight dashboards and cabins. Each unit gives real-time battery voltage readout, an independent anti-slip push-button to prevent parasitic drain, and three fast-charge outputs that share up to 78W total. The housings are nylon with a flip-up waterproof cover, making them suitable for marine, RV and automotive use where space, durability and multi-device charging matter.

How will the voltmeter help me on trips?

The integrated digital voltmeter displays battery voltage continuously so you can spot low-voltage conditions before they cause problems. It’s visible at a glance and helps you manage accessory loads when the engine is off.

• Real-time battery voltage readout on each panel
• Helps prevent unexpected dead batteries
• Displays while charging or idling for quick checks

What charging speeds and ports are available?

Each panel includes two USB-C PD 3.0 ports and one USB-A QC 3.0 port. The USB-C outputs deliver up to 30W per port; USB-A delivers up to 18W. When multiple ports are used, the combined output is intelligently distributed up to a 78W system limit.

• USB-C PD 3.0: up to 5V/3A, 9V/3A, 12V/2.5A (30W max)
• USB-A QC 3.0: 5V/3A, 9V/2A, 12V/1.5A (18W max)
• Smart IC balancing for safe simultaneous charging

How do I install these surface-mount panels?

Installation needs a single small wire hole and four screws to secure the cover plate—no large round cutouts required. Wire red to positive, black to negative, tighten the screws and snap on the cover for a quick upgrade to dashboards, consoles or wall panels.

• Surface-mount design fits any flat panel with one wire hole
• Simple red (positive) and black (negative) wiring
• Includes mounting screws and a cover plate for neat finish

What safety features protect my devices and battery?

The unit’s nylon housing resists scratches and wear, and the flip-up waterproof cover shields ports from splashes and dust. An internal smart IC prevents overvoltage, overheating, overload and short-circuit conditions while the anti-slip switch avoids battery drain when not in use.

• Flip-up waterproof cover for port protection
• Smart IC for overvoltage/overheat/short-circuit prevention
• Anti-slip memory switch to reduce parasitic battery drain

Who is this for: These TIANWIDJEW panels suit RV owners, boaters, vanlifers and drivers who need a compact, durable charging solution with battery monitoring. If you want fast charging for phones, tablets and accessories, a visible voltmeter and a surface-mount design that fits limited dashboard space, this two-pack provides redundancy and flexibility for multi-device use.