Specifications checked against manufacturer pages on 2026-08-24.
The Anker SOLIX C300 pairs 288 Wh of LiFePO4 cells with a 300 W inverter, which puts it in the compact bracket. We read every figure below off Anker SOLIX’s own product page on 2026-08-24, calculated what the rated capacity does to a set of household appliances, and listed what the page leaves out. Where a number is ours rather than the maker’s, the row says which.
In short. 288 Wh in the compact band: $1.15/Wh at the list price we recorded; 31.6 Wh per pound; 3,000 rated cycles to 80%. On our assumptions a full-size refrigerator calculates to 4.7–4.9 hr (start-up not assessed), and a 40 W CPAP calculates to 5.8–6.3 hr. 1 row we track is blank on the maker’s page; the section below says which. Anker SOLIX does publish 600 W as a boost mode, which we do not count as a motor-start surge rating. Every hour figure above is arithmetic, not a measurement.
Check the current price
It resolves to the same base model the table above describes, without accessories. Amazon prices change daily.
Who it is for, and who should skip it
Read this first; it decides whether the rest of the page is for you.
It fits if
- The unit has to move. 9.1 lb is a one-hand carry rather than a cart job, so car to porch to basement is realistic.
Skip it if
- You want resistive heat. A 1,500 W heater is above the 300 W continuous rating; it will not run.
- A hard-starting motor is the point. Anker SOLIX publishes no motor-start surge rating here, so published figures cannot confirm it spins up a pump or a compressor with an unusual inrush.
- A refrigerator through a whole working day. On a typical full-size unit this calculates to 4.7–4.9 hr (start-up not assessed); that job wants the next size up.
Every published specification
Where a row carries a number, a note under the table says where it came from. A row reading “Manufacturer does not state” is the maker’s silence; “Not yet verified by CalmWatt” is ours.
| Specification | Anker SOLIX C300 |
|---|---|
| Rated capacity | 288 Wh1 |
| Usable capacity (calculated)* | 245–259 Wh |
| Continuous AC output | 300 W2 |
| Surge output | No conventional surge stated (600 W boost mode)3 |
| Full recharge from wall | Manufacturer does not state (0–80% in 50 min)4 |
| Cell chemistry | LiFePO45 |
| Rated cycle life | 3,000+ cycles to 80%6,7 |
| UPS switchover | ≤10 ms8 |
| Expandable | No9 |
| Max solar input | 100 W10 |
| Max AC charging input | 330 W11 |
| AC outlets | 312 |
| Highest USB-C port | 140 W13 |
| App control | Yes14 |
| Stated noise | 25 dB15 |
| Warranty | 5 years16 |
| Weight | 9.1 lb17 |
| Manufacturer list price when checked | $329.9918 |
* Calculated: rated capacity × an assumed 85–90% conversion efficiency. No maker publishes a usable figure.
Notes on the figures
- C300, rated capacity: Rated capacity as stated in the manufacturer’s specifications table and in the product name, Anker SOLIX C300 Portable Power Station – 288Wh | 300W.
- C300, continuous output: Continuous rated AC output shared across all three AC outlets.
- C300, surge: The 600 W figure is delivered by Anker’s SurgePad boost mode, and the manufacturer’s own comparison chart labels it ‘SurgePad 600W’. It is not a conventional motor-start surge rating and should not be read as one.
- C300, recharge: The manufacturer states only a 0-80% figure: ‘Recharge to 80% in just 50 minutes with a wall outlet.’ A full 0-100% wall recharge time is not stated.
- C300, cell chemistry: Marketed elsewhere on the same page as LFP batteries.
- C300, cycle life: Cycle count to the point where the battery still holds 80% of its original capacity.
- C300, cycle life: Taken from the same specification entry as the cycle-life figure.
- C300, UPS switchover: The comparison chart on the same page lists this as under 10 ms. Upper bound.
- C300, expandable: The specifications table shows a dash for both expansion battery quantity and expandable capacity, indicating no expansion battery option for this model.
- C300, solar input: Maximum via the MPPT solar input, which accepts panels from 11 to 28 V at up to 8.2 A with an XT60 connector.
- C300, AC input: Maximum wall (AC) charging input at 120 V.
- C300, AC outlets: The specifications table lists the three outlets as NEMA 6-20.
- C300, USB-C: Two of the three USB-C ports are rated 140 W each and support two-way fast charging; the third USB-C port is rated 15 W.
- C300, app: App control works over Bluetooth or Wi-Fi via the Anker app; the specifications table also lists Mobile App: Yes.
- C300, noise: As stated by the manufacturer, measured from 3.3 ft away.
- C300, warranty: Stated as a 5-year warranty.
- C300, weight: Net weight of the unit itself.
- C300, price: Manufacturer’s store price for the standalone unit without a solar panel; no separate sale or strikethrough list price was displayed at the time of retrieval.
What Anker SOLIX does not state
The omissions are the part other pages copy from each other without noticing. Every gap on this unit’s page, named rather than quietly filled in. 29 of the 34 units in our database omit something, and this one is among them with 1 figure.
- A full wall-charge time. Absent from Anker SOLIX’s specifications for this unit when we checked.
- A motor-start surge rating. The 600 W figure Anker SOLIX publishes is a boost mode for resistive loads, so it does not answer whether a compressor starts. We do not treat it as if it did.
- Usable capacity. Universally absent. The band in the table above is our calculation from an assumed efficiency, not a figure anyone publishes.
This is not a mark against the product. It is a warning about pages that fill these rows in without saying where the number came from.
What it runs, and for how long
Every unit we cover meets the same appliance list, so nothing below is tuned to flatter this one.
| Appliance | C300 |
|---|---|
| Full-size refrigerator 150 W, 900 W start, 35% duty · eff. 85%–90% |
4.7–4.9 hr (start-up not assessed) |
| Mini fridge 70 W, 400 W start, 30% duty · eff. 85%–90% |
about 12 hr (start-up not assessed) |
| CPAP without humidifier 40 W · eff. 80%–87% |
5.8–6.3 hr |
| CPAP with heated humidifier 95 W · eff. 85%–90% |
2.6–2.7 hr |
| Gas furnace blower 400 W, 1600 W start, 40% duty |
Will not run |
| 1/3 hp sump pump 500 W, 1800 W start, 15% duty |
Will not run |
| Router and modem 20 W · eff. 80%–87% |
12–13 hr |
| Laptop 60 W · eff. 85%–90% |
4.1–4.3 hr |
| 1500W space heater 1500 W |
Will not run |
These are calculations, not measurements: hours = rated Wh × efficiency ÷ (appliance W × duty). The assumptions behind every figure are listed on How we verify; “Unlikely to start” means the appliance surge is above the stated rating. “Start-up not assessed” marks the rows where neither published figure settles whether the motor spins up; the hours after it assume it does.
The same specs, normalized
| Measure | C300 |
|---|---|
| Cost per watt-hour | $1.15/Wh |
| Watt-hours per pound | 31.6 Wh/lb |
| Surge headroom | Not applicable — the stated figure is a boost-mode rating, not a motor-start surge. |
| Recharge rate | Not available — Anker SOLIX does not state a full wall-charge time. |
| Rated cycle life | 3,000 cycles to 80% |
| Continuous watts per dollar | 0.91 W/$ |
These are measurements of shape, not scores. What each one means and which direction is better is on How we verify.
What those figures actually mean
Cost per watt-hour: $1.15/Wh. The $329.99 list price we recorded over 288 Wh of rated capacity. It is the one figure that compares a small unit with a large one honestly, and the figure a sale moves fastest. Recompute it against the price you are shown.
Watt-hours per pound: 31.6 Wh/lb. 288 Wh in 9.1 lb makes this a one-hand carry. Weight per watt-hour is the cost of the chemistry, not of the design.
Surge headroom: not applicable. The published figure answers a different question, so we do not compute a headroom ratio from it. An empty cell is more honest than a wrong one.
Rated cycle life: 3,000 cycles to 80% capacity. That is about 58 years at a cycle a week. Outage use never gets near it; van and off-grid use can. The percentage matters as much as the count: two ratings only compare when they name the same remaining capacity.
Continuous watts per dollar: 0.91 W/$. If your plan is one heavy appliance rather than several light ones for days, this is the ratio that describes your purchase.
Where it sits in our database
A single unit’s figures do not say whether a number is large or small. Ours do, because every unit below was transcribed the same way.
| Measure | C300 | Among verified units |
|---|---|---|
| Rated capacity | 288 Wh | 29th largest of 34 |
| Continuous AC output | 300 W | 32nd highest of 34 |
| Cost per watt-hour | $1.15/Wh | 32nd cheapest of 32 |
| Watt-hours per pound | 31.6 Wh/lb | 29th densest of 34 |
| Weight | 9.1 lb | 3rd lightest of 34 |
Rank is not a recommendation: the smallest unit here is the right answer for somebody. The row built on price uses the manufacturer list price recorded on 2026-08-24; the retail price behind our link moves independently, so recompute that row against what you are shown.
Three outages, and the figure that decides each
- One night, one CPAP. A 40 W CPAP without a humidifier calculates to 5.8–6.3 hr. The stated up to 10 ms handover is what decides whether the machine notices the outage.
- Twelve hours, one refrigerator. The roughly 900 W start is at or above what published figures can confirm, so the 4.7–4.9 hr (start-up not assessed) below assumes the compressor does start.
- The loads people forget. A gas furnace blower will not run at all and a one-third horsepower sump pump will not run at all. In most houses neither has a plug, so the answer runs through a transfer switch, not an inverter. A router and modem, meanwhile, calculates to 12–13 hr.
- Three days, with something to recharge from. The maker states no full wall-charge time, and it accepts up to 100 W of solar, so day two turns on your panels and your sky.
The C300 against other units
Ratios need something to sit beside. The C300 appears in 2 head-to-head pages here, each built from the same manufacturer figures.
Questions people ask about the C300
No answer here uses a number that is not on this page.
How long will the C300 run a refrigerator?
4.7–4.9 hr (start-up not assessed) on our assumptions for a typical full-size unit at 150 W running and a 35% duty cycle. Start-up is the check that comes before hours. A newer or smaller refrigerator will beat this figure.
Can the C300 run a CPAP all night?
A 40 W machine without a humidifier calculates to 5.8–6.3 hr on our assumptions, against the eight hours a night usually needs. The maker states up to 10 ms on the handover. Heated tubing and a humidifier change this figure sharply.
How much does the C300 weigh?
9.1 lb on the maker’s figure, or 31.6 Wh of rated capacity carried per pound. That is a one-hand carry, so it moves with you rather than living in one place.
How many cycles is the C300 rated for?
3,000 cycles to 80% of original capacity, on LiFePO4 cells, which is roughly 58 years at one cycle a week. Check the percentage before comparing this with another maker’s number.
Will the C300 run a space heater?
No. A 1,500 W heater is above the 300 W continuous rating.
What does the C300 cost per watt-hour?
$1.15/Wh at the $329.99 list price we recorded. Sale prices move weekly, so recompute against the price you are offered.
Check the current price
It resolves to the same base model the table above describes, without accessories. Amazon prices change daily.
Related reading
A 288 Wh battery cannot do what a gasoline generator does — its continuous rating does not cover a 1,500 W space heater at all — but it also cannot poison a household. The safety half of that trade-off is in our CPSC revision matrix of generator carbon-monoxide death counts, and the refrigerator page shows where this unit lands among all the others on one scenario.
Ordering before a storm? Check the arrival date at checkout — a unit that ships tomorrow can beat a better one that ships next week. Amazon Prime includes fast delivery on eligible items and starts with a free trial; we earn a commission if you join.
Sources and method
- Anker SOLIX C300: manufacturer product page, checked 2026-08-24.
Published specifications only, each transcribed from the maker’s own page; nothing here is bench-tested. Runtimes are calculated by CalmWatt with the formula printed above. Method: How we verify. More: Comparisons.