Anker Solix C1000 Gen 2 Test Results: What Independent Measurements Say About the World-Record Charge

On its official product page, Anker Solix markets the C1000 Gen 2 as having the fastest charging performance among 1 kWh portable power stations, "confirmed by third-party certification" (retrieved 03.09.2026). The number attached to it is the central claim behind every Anker Solix C1000 Gen 2 test: full in 49 minutes, over a 1,600 W AC input.

The wording is worth pausing on. Anker doesn't say "we measured this," it points at certification by someone else. That's more than most manufacturer claims in this category bring with them.

Two conditions ride along with those 49 minutes, and they rarely survive into the blogs that pass the figure around:

• UltraFast mode (Anker also markets it as HyperFlash) has to be active. It isn't out of the box. You enable it in the Anker app.

• The full 1,600 W has to actually be available at the socket.

Back at launch, Notebookcheck reported the 49-minute figure for the 1,024 Wh battery, and reported it as a manufacturer spec rather than its own measurement. That distinction slips constantly online, which is probably how we got here.

According to Guinness World Records, the power station reached full capacity after 43 minutes and 48 seconds. That was verified on 14.08.2025 in the category "fastest recharging portable power station (1 kWh)," and Guinness published the story in November 2025.

This is the strongest source available on the question. Guinness World Records is an external adjudicating body, not one of Anker's marketing channels.

And still: 43:48 is not 49 minutes.

Quick answer: The 43:48 comes from a record attempt run under that attempt's own controlled conditions. The 49 minutes is Anker's everyday figure for UltraFast mode. Neither source claims the two runs were set up identically. Treat them as one number and you've invented a statement nobody made.

Why labour the point? Because nearly every page covering this product picks one figure and drops the other. So you end up reading "world record: 49 minutes," which was never verified that way, or "charges in 43 minutes," which was never advertised that way. Both are close. Both are misquoted.

The sanity check nobody runs

Do the arithmetic with me. It takes about thirty seconds.

Notebookcheck measured how much energy actually flows into the unit before it's full: roughly 1,110 Wh (practice test, 20.12.2025, more on that below). At a 1,600 W input, 1,110 Wh ÷ 1,600 W is about 0.69 hours, so roughly 42 minutes. That's my own calculation from the figure Notebookcheck published, not a measurement.

Here's why it matters. Those 42 minutes would be the physical floor, assuming full power from the first second to the last. Guinness's 43:48 sits just above it. Anker's 49 minutes sits further above, which fits a charge that tapers near the top, as lithium cells always do.

So the two figures don't contradict each other. They land roughly where you'd expect them to land. That isn't proof of anything, but a fabricated record would probably fail this check, and this one doesn't.

The most solid single measurement in any Anker Solix C1000 Gen 2 test comes from Notebookcheck, a German-language outlet. Marcus Schwarten had the unit on his own metering gear for the practice test published 20.12.2025.

Three rows in that table deserve a second look.

Charging efficiency first. 1,024 Wh of rated capacity against roughly 1,110 Wh metered going in works out to about 92% (Notebookcheck, 20.12.2025). That's a good result. The missing 8% isn't a fault, it's conversion loss and fan.

Then discharge efficiency. Under a constant 250 W load at the AC output, roughly 850 Wh came back out, about 83% of rated capacity (same test). So the inverter costs you somewhere near a sixth of what's sitting in the battery.

And the number that appears in no test at all. From the wall and back to the wall: 850 Wh out of 1,110 Wh in is roughly 77%. That's just arithmetic on two of Notebookcheck's own figures, not a measured round-trip value, and it only holds for that one load condition. It's also the number that matters if you use the station as a buffer between the grid and a device.

About 45 dB from one metre away during fast charging is not a whisper, according to Notebookcheck. This isn't a machine you want next to the bed while it pulls 1,600 W.

testberichte.de aggregated the available Anker Solix C1000 Gen 2 reviews into a 1.3 ("sehr gut") composite on 11.02.2026, highlighting the short charge times above everything else. Honestly, though: that aggregate leans on the same Notebookcheck test. It's a second data point, not a second lab.

This is where a record figure turns into a household question. 1,600 W is a lot for a charger. Is it too much for a normal flat?

A standard German household socket usually sits on a circuit protected at 16 amps. According to EnBW, at 230 volts that gives a theoretical ceiling of 3,680 watts. Electrical guides such as Gira recommend keeping a shared circuit under roughly 2,500 watts in practice, since almost nothing hangs on such a circuit alone.

Quick answer: 1,600 W fits comfortably on a dedicated circuit (3,680 W theoretical, per EnBW). On a shared circuit, the practical 2,500 W guidance leaves only about 900 W for everything else. Add a kettle and a fan heater on the same fuse and it trips.

That's the realistic failure mode. Not "the station charges slower than advertised," but "the breaker in the hallway just went, and the fridge was on that circuit."

Which leads to a practical note that appears in no spec sheet. UltraFast is a switch, not a law of physics. If you're not leaving in an hour, charge on the lower setting and the whole question evaporates. The record figure describes a capability, not an operating state.

Most bad purchases in this family start here, well before anyone talks about charge times.

C1000 (the original). The predecessor. In its 20.12.2025 test, Notebookcheck describes the Gen 2 as noticeably lighter and more compact, with higher continuous output and faster charging. The price for that is specific: the Gen 2 gives up the first C1000's expandability via an add-on battery, and the built-in LED light is gone too.

C1000 Gen 2. The unit this article is about. 1,024 Wh, 2,000 W continuous, 3,000 W peak (manufacturer specs, reported consistently by Notebookcheck and testberichte.de).

C1000X. A separate model designation, not an alternative spelling of the Gen 2. This research pass found no independent measurement of that model worth citing, so there's no figure for it here. What I can tell you instead: compare the exact model designation on the unit and in the listing before you buy, not the product photo. These three look similar enough that the photo won't save you.

If your use case is genuine autonomy, meaning several days off-grid, then the lost expandability is the single most important sentence in this whole article. Not the 43:48.

Good fit if your pattern is short charging windows. Trade work with mains power during a break, a photo shoot between two locations, a weekend at a campsite with a power pillar, a market stall with one socket in reach. In cases like those, a station that's full again inside an hour is a real difference rather than a spec-sheet sport.

Poor fit if capacity matters more to you than speed. Multi-day autonomy rewards expandable capacity far more than a record charge time, and expandability is exactly what the Gen 2 traded away, per Notebookcheck.

Not a fit at all for a plane. 1,024 Wh sits orders of magnitude above the 100 Wh allowed in the cabin without prior approval. This station doesn't fly, in the cabin or in the hold. For what actually applies to batteries in hand luggage, see the airline rules for power banks and Wh limits.

On price I'm deliberately saying nothing specific. Street prices in this class swing hard, and the figures quoted inside review articles are snapshots of their publication date rather than current market prices. Any number I put here today would be wrong by next week.

What this Anker Solix C1000 Gen 2 test comes down to: the record is real, and an external body checked it. That's more than this industry usually offers. It just describes a record attempt, not your Tuesday evening.

What ends up mattering is less dramatic: about 92% going in, about 83% coming back out under a 250 W load, about 45 dB while it charges fast, and no expandability any more. All of it measured or reported by Notebookcheck on 20.12.2025, not by us.

Whether 43:48 or 49 minutes matters more to you is honestly the wrong question. The right one: do you even have a circuit that carries 1,600 watts on its own? If you do, this is a very good machine for short charging windows. If you don't, you're buying a capability you'll never call on.