Quick Take: Charging with the Monoprice 80W USB-C/USB-A wall charger

[Update below from Monoprice on the USB-A ratings.]

I recently bought the Monoprice 33467 wall charger, and got a question about charging wattage on the site a little while afterward. Since Monoprice does not provide specific rates for the ports on this device, other than 60 watts on USB-C (standard for USB Power Delivery chargers) and 80 watts total, I decided to get out some thirsty high-draw devices and USB power meters to see what the rates would be.

Testing kit

This device has a removable two-pin power cable, a USB-C port, and four USB-A ports. The USB-C port is rated for up to 60 watts with USB-PD, and the total adapter is rated for 80W.

Update: The vendor confirms 2.4A per USB-A port, with full capacity available across all four ports simultaneously. See end of post for more.

It gets a bit warm when you load it up, so I wouldn’t put it on a container of ice cream or on bare skin, but it’s not too hot for an 80 watt device.

These are bidirectional-capable testers that show voltage, amperage, milliamps of current, and direction of power. I believe these are identical devices, either licensed or flattered by one or the other vendor. I bought the Satechi almost two years ago, and wrote about it here); the Plugable came out afterward, I believe.

Satechi told me some time ago that they should handle 300W of power, and I’ve used theirs with the 130W proprietary Dell Thunderbolt 3 Docking Station charging option for the XPS 15 9550 laptops, without releasing any smoke.

The bidirectional feature is interesting, in that  you can use some USB-C mobile phones to charge other devices, and this will tell you which way the power is going. It’s also conceivable that you could charge a USB-C power bank with your laptop, as opposed to the other way around.

This is a formidable device in that it supports USB-A, USB-C, and Micro-USB input, with USB-A and USB-C output based on the input source. It’s rated for up to 30V/5.1A which should cover any USB-C charging I’ve seen.

It is large and not friendly to being plugged in next to another cable, as you can see from the picture, but it’s very convenient (even showing four wire voltage and three different English interfaces/displays as well as Chinese). It is not bidirectional, so you’ll plug the metal plug into the power source and your charging cable into the jack.

PortaPow is a UK company that came to my knowledge for their charge-only / data blocker cables. These cables block/bridge the data lines in a USB charging cable, letting you charge (potentially) faster while keeping a host or charging device from spuriously accessing the data on your device.

Their power meters offer similar functionality along with a backlit LED power display. The pictured/linked one is their third version; I’ve used the first two versions successfully, although the older ones do not to my knowledge support higher than 5V charging.

Charging targets:

All targets were chosen for capability to charge at higher than 10W rates, as well as being under half charge so that full charging rate would be realized.

  • Pixel 2 XL from Google, at around 20% charge (USB-C)
  • iPhone 8 Plus from Apple, at under 20% charge (Lightning)
  • iPad Pro 10.5 from Apple, at about 45% charge (Lightning)
  • PowerCore 26800 Premium Portable Charger from Anker, at about 20% charge (Micro-USB)
  • XPS 13 9370 from Dell, at about 40% charge (USB-C PD)
  • XPS 15 9550 from Dell, at about 4% charge (USB-C PD)

Quick and dirty test results

The Pixel 2 XL charged at 12 watts (9.33 volts) with a USB-C cable. With a USB-A to USB-C cable, I got closer to 5 watts, although the cable might be to blame.

The iPad Pro charged at about 12 watts (5.12 volts) with a USB-A to Lightning cable, and about 28 watts with the USB-C to Lightning cable.

The iPhone 8 Plus charged at about 18 watts (9.37 volts) with USB-C to Lightning, but only 8 watts with USB-A to Lightning.

The Anker battery pack charged at about 17 watts (9.34 volts) which is fair for the Quick Charge 2.0 level of input (the newer version of the pack supports QC 3.0, and the Power Delivery version of course supports USB Power Delivery at up to 27 watts input).

The XPS 13 9370 negotiated to 30 watts of input (at 20V profile) while powered down.

The XPS 15 9550 negotiated to 45 watts of input (also at 20V profile) while powered down. This would have reported a BIOS adapter error if I had booted up while connected, as would the Pixel C 60 watt charger, but it will still charge.

Where do we go from here?

In short, if you need to charge several devices at a time, but don’t want 4-5 chargers, the Monoprice 80 watt charger is probably a good choice. If you have a more power-hungry device, like a large MacBook Pro or a heavy USB-C battery pack, you may still want to keep an 87 watt charger around for it, but for modest / travel use, the power this device offers should be good enough to keep you going.

I will probably plug the charger itself into an AC power meter, and see how it handles multiple inputs (including the laptops) in parallel. My expectation is that USB-C would take priority, so with 45W going to USB PD, I could use up to 35W max on the USB-A ports. I did have the iPad, Pixel XL, and Anker battery plugged in at the same time and they seemed to have similar charge rates to each one individually connected.

Have you had experience with the Monoprice charger, or have any test conditions you wonder about? Share in the comments, and I’ll check them out if I can.

[This was intended to be a Quick Take post, and while it was created quickly, it’s not as short as I’d originally planned.]

Update: A Monoprice product specialist responded to my inquiry this morning (11/9/2018). They said that the charger “can supply at least 2.4 amps each port and all four can supply this current simultaneously. The total wattage of 48 Watts across all USB-A ports.” Based on this reading, if you are pulling 12 watts per port, you should be able to drive 32 watts of USB-C which should cover an XPS 13 or smaller, a battery pack, or the newer Apple devices with rapid charging.

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First look: Satechi’s Type-C Power Meter

My friend John Obeto pointed out some pre-release coverage of Satechi’s new USB-C power meter a week or so ago. I’ve had a number of different USB-A (standard port) testers and meters for a while, but with more devices coming into rsts11 headquarters with Type C connections (including the XPS 13 9350 and XPS 15 9550, Apple’s 12″ Macbook, the ASUS Zenpad Z10 from Verizon, and the Nexus 6P by Huawei and Google), I’ve wanted to look at power consumption beyond what an A-to-C adapter could reveal.

For those of you new to USB-C, it’s designed (in part) to be a universal connector for power and data, incorporating high speed data in a connector shared with Thunderbolt 3 (40gbit capability), a reversible connector like Apple Lightning, and some daisy-chaining capabilities like Thunderbolt 2. The standard allows for up to 100W of power, although the highest powered adapters I’ve found are 60W. The Dell Thunderbolt 3 docking station has a non-standard option beyond this; when you’re connected to a recognized Dell device it will bump the power up to 130W just like the stock XPS 15 adapter.

But the catch is that USB-A power supplies are generally limited to 2.4A at 5V, with some exceptions for Qualcomm Quickcharge and Samsung Adaptive Fast Charging and the like (which can go to 9V or 12V on compatible devices). So most USB-A power meters will only show/handle 2.4A at 5V, or 12 watts. My smaller USB-C devices easily pull 15W whereas the XPS 15 should pull a lot more than that. Continue reading