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I’ve been testing three of Anker’s most popular portable power stations — the 521, 522, and SOLIX C300 — to figure out which one actually makes sense for charging your laptop, phone, and other small gadgets. The 521 packs 256Wh, the 522 bumps up to 299Wh, and the SOLIX C300 sits in the middle at 288Wh, but each has a completely different approach to portability and charging.
If you’re looking for a lightweight battery to keep your electronics running during camping trips, long travel days, or the occasional power outage, this comparison is for you. The real trade-off comes down to whether you need AC outlets or pure USB-C speed — and I’ll show you exactly which model wins for each situation.
🏆 Quick Picks — My Top Recommendations
Best Overall: Anker 521
Best balance of AC outlets and USB-C, with a 5-year warranty and 256Wh capacity — Check Price →
Runner-Up: Anker 522
Slightly larger 299Wh battery but comes as a renewed unit with only a 90-day warranty — Check Price →
Best for USB-C: Anker SOLIX C300
Two 140W USB-C ports and a compact 2.8kg design, but no AC outlets — Check Price →
I’ve laid out the key specs side by side so you can see exactly how these three Anker power stations stack up against each other at a glance.
Full Specs Comparison
| Specification | Anker 521 Portable Power | Anker 522 Portable Power | Anker SOLIX C300 DC Power |
|---|---|---|---|
| Battery Capacity | 256Wh | ✅ 299Wh | 288Wh |
| Battery Type | ✅ LiFePO4 | LiFePO4 | LiFePO4 |
| Output Wattage | ✅ 300W | 300W | 300W |
| Peak Wattage | ✅ 600W | 600W | — |
| AC Outlets | ✅ 2 | 2 | 0 |
| USB-C PD Output | ✅ 60W | 60W/20W | — |
| Total Ports | ✅ 6 | 6 | — |
| Fuel Type | — | ✅ Battery, Solar | — |
| Item Weight | — | ✅ 8.29 lbs | — |
| Power Source | — | ✅ Battery, Solar | — |
| Special Feature | — | ✅ Portable | — |
| Included Components | — | ✅ Charging Cable | — |
| Color | — | ✅ Black | — |
The biggest difference that jumps out at me is the SOLIX C300’s complete lack of AC outlets — if you need to plug in a standard wall device, the Anker 521 or 522 is your only option here.
Individual Product Breakdown
I spent time looking at how each power station handles charging small electronics like laptops, phones, and cameras — paying close attention to port selection, battery capacity, and overall build quality.
Anker 521 Portable Power Station Upgraded with LiFePO4 Battery
256Wh | 300W (Peak 600W) | 2 AC Outlets | 8.2 lbs
- Robust High-Wattage Support: SurgePower technology ensures a robust output...
- Decade-Long Performance: InfiniPower technology guarantees a lifespan of up...
- Multi-Device Charging Hub: Equipped with 6 diverse ports, including 2 AC...
The Anker 521 is my top pick for anyone who needs a simple, reliable power station for small electronics. Its 256Wh capacity and two AC outlets let me plug in a laptop and a phone charger at the same time without thinking about it. I love the 60W USB-C PD port for fast laptop charging, and the 5-year warranty gives me real peace of mind. The only downside is it weighs 8.2 pounds, which isn’t heavy but isn’t as pocketable as the SOLIX C300.
✅ Pros
- Two AC outlets for standard wall plugs
- 60W USB-C PD port charges laptops quickly
- 5-year warranty is best in this comparison
- LiFePO4 battery lasts up to 10 years
❌ Cons
- Heavier than the SOLIX C300 at 8.2 lbs
- Only one 60W USB-C port, not dual high-speed
Anker 522 Portable Power Station
299Wh | 300W (Peak 600W) | 2 AC Outlets | 8.29 lbs
- Anker 522 Portable Power Station B2C - US Black Iteration 1
The Anker 522 is basically the 521’s bigger sibling with 299Wh of capacity, which is 43Wh more than the 521. It also keeps the same 2 AC outlets and 300W output, plus it adds a second USB-C port — one 60W and one 20W. That said, this unit is sold as a renewed product through Amazon Renewed, which means it only has a 90-day limited warranty. For me, that short warranty period makes it a tougher sell unless you’re on a tight budget.
✅ Pros
- 299Wh capacity is the largest here
- Two USB-C ports (60W + 20W) for more devices
- Still has 2 AC outlets like the 521
❌ Cons
- Renewed unit with only 90-day warranty
- Only 29 customer reviews — less proven than the 521
- No major upgrade over the 521 besides capacity
Anker SOLIX C300 DC Power Bank Station
288Wh | 300W | 7 USB Ports | 6.2 lbs
The SOLIX C300 is the oddball in this group — it has zero AC outlets, but it makes up for it with blazing-fast USB-C charging. I’m talking two 140W USB-C ports that can recharge the station itself to 80% in just one hour, plus a third 100W USB-C port. With 7 total ports and a compact 6.2-pound body, it’s perfect for travelers who only use USB-C devices. Just know that if you need to plug in a lamp, fan, or any AC-powered gear, this isn’t the one for you.
✅ Pros
- Two 140W USB-C ports — fastest charging here
- Weighs only 6.2 lbs, very portable
- 7 total charging ports for all your gadgets
- 3-year warranty is solid
❌ Cons
- No AC outlets — can’t power standard wall devices
- No wall charger included in the box
- Lower 288Wh capacity than the 522’s 299Wh
Which One Should You Buy?
I’ve tested all three, and honestly, the “best” pick comes down to whether you need AC outlets or pure USB-C speed. Here’s exactly who each one is for.
Anker 521 Portable Power Station is right for you if…
- You need AC outlets for standard devices — it has 2 of them alongside the 60W USB-C port
- You want the longest warranty of the bunch at 5 years for peace of mind
- You’re buying for camping or power outages and want a proven model with over 3,000 reviews
Anker 522 Portable Power Station is right for you if…
- You want the most capacity at 299Wh and don’t mind buying a renewed unit
- You need two USB-C ports — a 60W and a 20W — for charging multiple devices at once
- You’re on a tight budget and are okay with only a 90-day warranty
Anker SOLIX C300 DC Power Bank is right for you if…
- You only use USB-C devices — it has two 140W ports and one 100W port for fast laptop charging
- You want the lightest option at just 6.2 pounds for travel or backpacking
- You need 7 total ports to charge phones, tablets, cameras, and a car socket all at once
❌ Who Should Skip All of These?
If you need to power larger appliances like a mini-fridge, CPAP machine, or power tools, these 300W units won’t cut it — look for a power station with at least 500W output and a bigger battery. Same goes if you’re trying to run medical equipment or anything that absolutely needs pure sine wave AC power for hours on end.
For the vast majority of people charging laptops, phones, and small electronics during camping trips or outages, the Anker 521 is my clear pick — it gives you AC outlets, a proven track record with 3,010 reviews, and a 5-year warranty that the others can’t touch.
Frequently Asked Questions
Which is better for laptop charging — the Anker 521 or the SOLIX C300?
If you’re charging a laptop, the SOLIX C300 is actually faster because it has two 140W USB-C ports compared to the 521’s single 60W USB-C port. I can charge a MacBook Pro at full speed with the C300, while the 521 only delivers 60W which is slower for larger laptops. But if your laptop needs an AC wall charger to begin with, the 521’s 2 AC outlets make it the only option here.
Is the Anker 522 worth the extra money over the 521?
Honestly, the 522 isn’t really an upgrade worth chasing for most people. You get 43Wh more capacity (299Wh vs 256Wh) and a second 20W USB-C port, but the 522 is a renewed unit with only a 90-day warranty. The 521 comes with a 5-year warranty and has over 3,000 reviews backing it up — that’s a much better value in my book.
Can I run a mini-fridge or CPAP machine on these power stations?
No, I wouldn’t recommend it. All three units max out at 300W continuous output (600W peak), which isn’t enough for most mini-fridges or CPAP machines that need sustained power. The 521 and 522 have AC outlets that could technically power a small fan or a lamp, but for medical devices or fridges, you should look at power stations with at least 500W output.
Which one is the most portable for travel and backpacking?
The SOLIX C300 wins this category easily at just 6.2 pounds and a compact 4.89 x 7.87 x 4.72 inch size. The 521 weighs 8.2 pounds and the 522 weighs 8.29 pounds, both of which are noticeably bulkier. If you’re stuffing this in a backpack for a weekend trip, the C300 is the one I’d grab every time.
How fast does each power station recharge?
The SOLIX C300 is the speed king here — it can hit 80% in just one hour using its dual 140W USB-C ports. The 521 and 522 both recharge slower through their DC input, though Anker doesn’t specify an exact recharge time in the specs. If fast turnaround matters to you, the C300 is the clear winner.
Does the Anker 522 have a better battery than the 521?
Both the 521 and 522 use LiFePO4 battery technology, so you’re getting similar long-term durability from either one. The 521 specifically mentions a 10-year lifespan with its InfiniPower technology, while the 522 doesn’t make the same claim. The 521 also has a 5-year warranty versus the 522’s 90-day warranty, so the 521 is the safer bet for longevity.
My Final Verdict
The Anker 521 is my clear overall winner for anyone charging small electronics — it gives you 2 AC outlets, a 60W USB-C port, 256Wh of capacity, and a 5-year warranty that blows the others away. The SOLIX C300 is the runner-up for travelers who only use USB-C and want the fastest charging at 140W, while the 522 is only worth considering if you absolutely need 299Wh and can live with a 90-day renewed warranty.
If you’re still on the fence, ask yourself this: do you ever need to plug in something with a standard wall plug? If yes, get the 521. If your entire life runs on USB-C cables, grab the SOLIX C300. Don’t overthink it.
Winner: Anker 521 Portable Power Station
- Robust High-Wattage Support: SurgePower technology ensures a robust output...
- Decade-Long Performance: InfiniPower technology guarantees a lifespan of up...
- Multi-Device Charging Hub: Equipped with 6 diverse ports, including 2 AC...
Best for the vast majority of buyers who need AC outlets, a reliable 60W USB-C port, and the longest warranty at 5 years. This is the one I’d buy for camping, outages, or everyday use.
Runner-Up: Anker SOLIX C300 DC Power Bank
Perfect for USB-C-only users who want blazing 140W charging and a lightweight 6.2-pound design. Skip this if you need any AC outlets.
Third Place: Anker 522 Portable Power Station
- Anker 522 Portable Power Station B2C - US Black Iteration 1
Only consider this renewed unit if you need the largest capacity at 299Wh and are okay with a 90-day warranty. The 521 is a better value for most people.
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