What "PD 100W" on a power bank actually promises (and why the Mini cares)

“PD 100W” means a USB-C port can supply 100 watts through USB Power Delivery, which in the standard range is 20 volts at 5 amps. That’s exactly the profile Starlink requires to run a Mini over USB-C: 100 W Official spec: From a Starlink specification sheet or help article. Checked Oct 5, 2026 at 20 V / 5 A, with Starlink’s USB-C to barrel cable. But the number on the box often describes the whole device, not one port, and 5 A only flows through a cable built for it. Here’s how to tell whether a bank or charger will really work.

How USB Power Delivery works, briefly

A USB-C charger doesn’t just push power. The charger and the device first agree on a voltage and maximum current from a short list of profiles, then power flows. That negotiation is USB Power Delivery, “PD”.

• Standard range: USB-IF says USB-IF: before PD 3.1, USB PD topped out at 100 W, using 20 V over Type-C cables rated at 5 A. So 100 W is the top of the classic PD range, and it’s only reachable as 20 V × 5 A.
• Extended range (PD 3.1): USB-IF: USB PD 3.1 adds 28 V, 36 V and 48 V for 140, 180 and 240 W. Those higher voltages are for devices that ask for them.

The Mini’s requirement sits at the very top of the standard range. There’s no slack: a port that maxes out a little lower doesn’t run it a little worse; it doesn’t run it.

Why the Mini needs the full 100 W

Starlink’s help center: To power the Mini over USB-C, Starlink requires a USB PD source of at least 100 W (20 V / 5 A), using Starlink's USB-C to barrel jack cable. And: Starlink says the Mini will not work with USB PD sources rated 65 W or lower.

On paper the Mini averages 25–40 W Official spec: From a Starlink specification sheet or help article. Checked Oct 5, 2026, so why demand a 100 W source? Because its input is rated at 60 W Official spec: From a Starlink specification sheet or help article. Checked Oct 5, 2026, it draws more at boot (one owner measured 36–39 W Community report: A dated measurement posted by an owner, cited. Checked Oct 5, 2026 for the first minutes), and a USB-C source that’s working at its limit droops or shuts off. The 100 W profile is the headroom: about 1.7× the input rating.

A 65 W port tops out at 20 V × 3.3 A. The Mini asks for more and the port refuses or cuts out.

Reading a power bank or charger label

The marketing number and the port rating are different things. On the label (often tiny, on the back or bottom), look for:

1. “USB-C1: 5V⎓3A, 9V⎓3A, 15V⎓3A, 20V⎓5A” or similar, listed per port. The 20 V line must say 5 A. If it says 3.25 A, that’s 65 W.
2. “Total output 100W” or “Max 100W (combined)”. This is the trap. A bank with two USB-C ports might give 100 W to one port alone but split it 65 + 30 when both are used. Plug nothing else in while it runs the Mini.
3. Which port. Many banks have one 100 W port and one smaller one. The label shows which is which.
4. Low-battery behavior. Some banks drop their highest profile when nearly empty. Not usually on the label; reviews or a USB-C meter will show it.

The cable is half the profile

At 5 A, the cable matters as much as the port. The USB Type-C specification says USB Type-C spec: every cable rated above 3 A is an electronically marked (e-marked) cable, so 100 W (20 V x 5 A) needs a 5 A e-marked cable. The e-marker is a chip in the plug that tells the charger the cable can carry 5 A. Without it, a correctly working charger limits itself to 3 A, which is 60 W at 20 V, and the Mini fails.

For the Mini there’s a simpler rule: use Starlink’s cable. USB-C power requires Starlink's own USB-C to Barrel Jack cable accessory (Mini USB-C Cable), sold in the Starlink Shop. The Starlink Mini USB-C Cable is 5 m (16.4 ft) long and replaces the kit's 15 m power cable. Starlink adds that it’s Starlink's USB-C cable is only for powering the Mini; it is not for charging phones and not compatible with the Gen 3 Router. And The barrel-jack end of the USB-C cable seals to IP67 at the Mini; the USB-C end should not be exposed outdoors.

When “100 W” still fails: owner reports

Real failures from owner threads, each dated and linked on our watts table and sources below:

• A TacomaWorld member's two 100 W PD power banks would not power the Mini at all (no red light). Community report: A dated measurement posted by an owner, cited. Checked Oct 5, 2026
• Another member says his 65 W PD output works only with a short cable, and suggests a '100 W' bank may not really deliver 100 W. Community report: A dated measurement posted by an owner, cited. Checked Oct 5, 2026
• A reader's Goal Zero Yeti 1000X would not start the Mini from its 60 W USB-C port or its 12 V Anderson output; only the AC adapter worked. Community report: A dated measurement posted by an owner, cited. Checked Oct 5, 2026

The second report is interesting: a 65 W output working “only with a short cable” goes against Starlink’s statement, and the owner himself suggested his “100 W” bank may not have delivered 100 W. We’d treat any sub-100 W success as luck, not a plan. Starlink only guarantees Mini performance with its own power supply and cable.

PD 3.1, 140 W and 240 W chargers

Bigger chargers are fine for the Mini as long as they include the standard 20 V / 5 A profile, which they normally do. The extra wattage is reached at 28, 36 or 48 V, which the Mini doesn’t request over USB-C. Don’t pay for 240 W for the Mini’s sake. Do make sure the cable is Starlink’s.

PD trigger boards and “USB-C to DC” adapters

A PD trigger is a small board that asks a USB-C source for a fixed voltage (say 20 V) and outputs it on plain DC wires. In principle a 20 V trigger feeding the Mini’s barrel jack sits inside the Mini’s 12 V–48 V input range. In practice, the trigger and its cable also need to handle 5 A, and Starlink only guarantees its own cable. Our battery bench protocol uses a trigger board to load-test banks at the Mini’s profile; we don’t recommend one as your daily power path.

Quick checklist

• One port, labeled 20V⎓5A (100 W).
• Nothing else plugged into the bank while it runs the Mini.
• Starlink’s USB-C to barrel cable, not a generic cable plus adapter.
• Bank charged and at room temperature for the first boot.
• USB-C end and bank kept out of rain.

What to do next

Battery size is the next question: how long a battery runs the Mini works it out by watt-hours. For banks that pass the label check, our USB-C power bank guide covers capacity, flying limits and what our bench will measure.