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Foldable 28W solar panel with digital ammeter display and dual USB ports

BFKK

BFKK 28W SunPower Solar Panel Charger with Digital Ammeter, Dual USB 5V/4A, IPX4

SKU CH-9BTN-BM95P

A portable 28W SunPower solar panel with a digital ammeter and dual USB ports delivering up to 5V/4A for phones and tablets

  • Battery TypeLithium-Ion
  • Real-time current monitoring with built-in digital ammeter
  • 24% SunPower cell efficiency for faster solar charging
  • Auto-restarts charging within 30 seconds after clouds pass
  • Dual USB-A ports deliver up to 5V/4A combined output
  • IPX4-rated PET surface withstands splashes during outdoor use

Portable solar charger

The BFKK 28W SunPower panel converts sunlight at up to 24 percent efficiency through a foldable four-section design. A built-in digital ammeter displays real-time current between .8 and 11 amperes depending on conditions. Dual USB-A ports share a 5V 4A total output with a single-port maximum of 5V 2.4A. IPX4 rating and four carabiners support outdoor mounting.

Outdoor enthusiasts and USB device owners

Hikers, campers and travellers who need lightweight renewable power for phones, tablets or power banks will find the folding format practical. The smart IC restarts charging automatically within 30 seconds after cloud cover clears. Buyers who require laptop charging, barrel-connector output or an integrated battery for night-time use should look at a different product class.

28W SunPower conversion efficiency

The 24 percent cell efficiency is the single figure that determines how much usable power the panel harvests from available sunlight. Higher efficiency means more current in limited space and shorter charge times for connected devices. If the efficiency level does not match the energy demand of the intended gear, a larger or alternative charging solution will be necessary.

Highlights

  • Real-time current monitoring with built-in digital ammeter
  • 24% SunPower cell efficiency for faster solar charging
  • Auto-restarts charging within 30 seconds after clouds pass
  • Dual USB-A ports deliver up to 5V/4A combined output
  • IPX4-rated PET surface withstands splashes during outdoor use

Specifications

Battery TypeLithium-Ion

Questions about this item

How do I decide between the single-port and dual-port output limits on this 28W panel?

The panel provides one USB-A port at up to 5V/2.4A and two ports combined at up to 5V/4A. Use a single port for a tablet or power bank that can accept 2.4A, or both ports together to charge two phones at once.

What does the 24% conversion efficiency mean for actual charging speed in sunlight?

The SunPower cells convert up to 24% of solar energy into electricity, so under strong sun the panel can deliver its rated 28W. Cloud cover or angled light will reduce output, but the built-in chip restarts charging within 30 seconds when brightness returns.

What does the IPX4 rating allow me to do with the panel outdoors?

IPX4 means the panel resists splashing water from any direction, so it survives rain showers or splashes during camping, hiking or boating. It is not submersible, so keep it out of standing water.

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