DC Input, USB Fast Charger

50W, 10.8A, multiport USB charger with wattmeter that intelligently detects and adapts to device charging speed

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The Pirl Charger is a high capacity USB charger for consumer devices.

Current USB chargers restrict you to wall outlets and do not provide any information on how much power devices are drawing.

We solve these problems by with a DC input charger and a wattmeter LED display. Each port fast charges to 2.7A, and it is a robust build of aluminum plates, which makes it durable to be used at home, in a car, with lead acid batteries and battery packs.

We're live on Kickstarter:

2.7A per port
Each port delivers a maximum current of 2.7A, and doesn't throttle when all ports are in use, so you can plug in 4 iPads at max speed. It detects and optimizes charging speed by adapting to your device's particular charging scheme. 


Each USB port is electrically independent and contains robust circuitry with overheating, static discharge, short circuit, and reverse polarity protections. This means it protects itself and your devices from harm. 

Wide input range

It takes DC input ranging from 7V to 17V, and can be used anywhere with wall outlets, car power ports, lead-acid batteries, DC-output solar panels, and lithium-ion battery packs (2S, 3S, and 4S). 


It has an integrated wattmeter so you don't need a multimeter to know how much power you are drawing devices. 


Mechanically, it is built with anodized aluminum top and bottom plates, and the middle layers are made of FR4.


You can see the specs at 


We have received a teardown review by Lygte.

Portable Network Graphics (PNG) - 22.07 kB - 04/14/2018 at 17:37


Portable Network Graphics (PNG) - 22.32 kB - 04/14/2018 at 17:37


Portable Network Graphics (PNG) - 24.07 kB - 04/14/2018 at 17:37


Portable Network Graphics (PNG) - 22.21 kB - 04/14/2018 at 17:37


Portable Network Graphics (PNG) - 22.00 kB - 04/14/2018 at 17:37


View all 9 files

  • 4 × USB Charging Port Controller (TI)
  • 4 × DC-DC Buck Converter (Diodes Inc.)
  • 4 × Type A USB
  • 4 × ESD Protection Chip (TI)
  • 1 × ATtiny Microcontroller (Microchip Tech.)

View all 7 components

  • Pirl, USB Fast Charger

    Meta Unknown04/14/2018 at 17:02 0 comments


    Single charging pathway (complete)

    4 independent charging pathways (complete)

    Adding wattmeter (complete)


    Adding static protection chip (complete)

    Adding ferrite bead (complete)

    Overheating protection (complete)

    Over-current and short protection (complete)

    Reverse polarity (complete)


    Aluminum top and bottom plates - third party manufactured (complete) 

    FR4 Middle layers, glued - third party manufactured (complete)

    Full feature product (complete)


    Testing: thermal, noise testing - third party reviewer (complete)

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Enjoy this project?



nioko wrote 06/14/2018 at 05:26 point

You should ask / send one to

Would be interesting to see his results.

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pearse wrote 04/26/2018 at 17:59 point

The anodized case and silkscreening looks really nice. Where / how did you get you make it?

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Meta Unknown wrote 05/08/2018 at 16:32 point

It's laser cut, sand blasted, anodized and silkscreened. We sourced from multiple suppliers in the US and China.

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bobricius wrote 03/17/2018 at 12:38 point

beauty design

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