Review · House brand · 30W class
onn. 30W: the cheapest honest step up from 20W.
30W stops being a phone charger and starts being a small-device charger: it fills an iPad Pro at its ~30W peak and keeps a MacBook Air alive. Walmart's house brand reaches that tier for very little, with the usual caveat about published detail.
Why 30W is the class worth buying
20W covers a phone; 30W covers a phone at full speed, an iPad Pro at its peak, a Switch in handheld mode, a Meta Quest 3, and a MacBook Air overnight — Apple shipped a 30W brick with the Air for years. The next step is 65W, at considerably more money: see 20W vs 30W. onn. is Walmart's house brand and re-sources, so this reviews the tier, not a part number.
| Line item | The 30W class | Check on the listing |
|---|---|---|
| Rated output | 30W maximum on one USB-C port | Whether that is per-port or shared |
| Port count | Usually 1× USB-C; some add USB-A | The split, if there is a second port |
| Protocol | PD with fixed rails including 15V and 20V | The ladder; 15V is what a Switch wants |
| Form factor | Compact wall cube, folding blades on most revisions | Blade folding |
| Notable feature | Certified 30W at close to 20W money | UL or ETL mark |
The rails matter more than the headline. A charger offering 5V, 9V, 12V, 15V and 20V is flexible; one offering 5V and 9V is a 20W charger with a bigger number.
What it's genuinely good at
Price per usable watt. The best-value tier in the category, pushed further — real money for a household buying four chargers.
Headroom without bulk. A 30W GaN-era cube is barely larger than a 20W one but removes the "will this charge my tablet" question.
A legitimate iPhone charger. Modern iPhones peak in the 20–27W range, so 30W runs them at maximum with margin — see iPhone fast charging.
Where it falls short
Thin published specification, again. The defining house-brand weakness: you buy a wattage number and a certification mark, not a documented profile ladder. If a rail matters, buy a brand that prints it.
No PPS claim. A Galaxy S25 wants 25W PPS, an S25 Ultra 45W PPS. Neither is guaranteed here — buy Samsung's own 25W or a documented PPS charger.
Not a Switch dock charger. Docked mode wants 15V/2.6A — 39W, whatever the 15V rail suggests; see chargers for the Nintendo Switch.
Not a working laptop charger. A MacBook Air holds charge under light load, but real work at 30W input loses ground. If the machine is your job, buy 65W.
Distribution. Availability elsewhere is inconsistent, and a marketplace listing deserves our fake-charger checks.
Device fit
Full speed: every iPhone including the 16 Pro Max, iPad Air, iPad Pro at its ~30W ceiling, AirPods, Apple Watch, Meta Quest 3 at 18W, Kindle, GoPro. Not at rated speed: MacBook Air M-series (fast-charge wants 35W+), Steam Deck (45W). Not served: Switch dock, MacBook Pro, Galaxy Ultra at 45W, iPhone 17's 60W burst.
- 30W
onn. 30W USB-C
The cheapest route into the tablet tier.
- Class
- 30W, one port
- Protocol
- USB-C PD
- Best for
- Phone + tablet
- Watch for
- Rails not printed
- 30W
Anker Nano 30W
Published profiles, folding plug, real support.
- Class
- 30W
- Protocol
- PD, published
- Best for
- Certainty + travel
- Trade
- Costs more
- 20W
Amazon Basics 20W
One tier down: right for a phone alone.
- Class
- 20W
- Protocol
- USB-C PD
- Best for
- Bedside, spare
- See
- Amazon Basics 20W review
Buy it, or buy around it
Buy it as a cheap second charger for a phone-and-tablet household; buy around it if you need PPS, a Switch dock, or a working laptop. See the 30W wattage page, best budget chargers, the Insignia 65W review, and the reviews hub.
FAQ
Is 30W enough for an iPhone?
More than enough. Modern iPhones peak between 20W and 27W, so 30W runs them at maximum and the extra watts sit unused.
Will onn. 30W charge a MacBook Air?
It will, and Apple shipped a 30W adapter with the Air for years. It will not fast-charge current models, which want 35W+.
Does onn. make its own chargers?
onn. is Walmart's house brand: units come from contract manufacturers and get revised without a name change. Treat the current listing as the specification.
Is a house-brand charger safe?
One carrying a genuine UL or ETL mark has had the same safety testing as a name brand. The gap is in published detail, not electrical safety.