Anker SOLIX C300
The C300 holds 288 Wh behind 300 W of continuous AC output. It scores 4.7 out of 10 against the rest of this catalogue, ranking 4 of 8 in its size class. On the numbers, it switches over fast enough to carry a computer through a cut. The figure to watch is the other way: continuous output is limited, so heating appliances are out of reach.
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Our score
Ranked 4 of 8 among units under 500 Wh
Scored on 85% of the weighting: the maker does not publish every figure.
Scores are calculated from published specifications, not opinion. How the score is built
The full specification
Every figure below is read from the maker's own specification page. Where a value is missing, it is missing because Anker SOLIX does not publish it, not because it was too much trouble to find.
| Capacity | 288 Wh |
|---|---|
| AC output | 300 W |
| Surge | 600 W |
| Cell chemistry | LiFePO4 |
| Cycle life | 3,000 cycles to 80% |
| Wall recharge | Not published |
| Max solar input | 100 W |
| UPS switchover | 10 ms |
| Weight | 9.1 lb (4.1 kg) |
| Extra batteries | Not expandable |
Where it is strong, and where it is not
- Backup switchover. On this axis it switches over fast enough to carry a computer through a cut.
What should give you pause
- AC output. Here continuous output is limited, so heating appliances are out of reach.
- Capacity. Here capacity is modest, so plan around short runs rather than whole days.
- Expansion. This unit takes no second battery. The capacity it has on the day you buy it is the capacity it keeps.
What it will actually run
These estimates use the same arithmetic as the run time calculator: usable watt hours after an assumed 85% inverter efficiency, divided by the appliance's average draw rather than its peak. The fridge figure assumes the compressor runs about a third of the time, which is what makes it plausible.
| Appliance | Typical draw | Estimated run time |
|---|---|---|
| Fridge | 120 W | 5 h 50 min |
| CPAP machine | 45 W | 5 h 26 min |
| Router and modem | 15 W | 16 h 19 min |
| Television | 90 W | 2 h 43 min |
| Microwave | 1200 W | 0 h 12 min |
Read the rating plate on your own appliance before trusting any of these. The wattages above are common starting points, not measurements of your kit.
The closest alternatives
The units nearest this one in capacity, with their own scores. Capacity is the honest axis to shortlist on: two units of the same size are genuinely substitutable, and everything else is a trade.
| # | Brand | Model | Score | Capacity | AC output | Weight | Actions |
|---|---|---|---|---|---|---|---|
| 1 | | Anker SOLIX C300 DC | 5.9/10 | 288 Wh | Not published | 6.2 lb (2.8 kg) | Check price |
| 2 |  | EcoFlow RIVER 3 Plus | 4.4/10 | 286 Wh | 600 W | 10.4 lb (4.7 kg) | Check price |
| 3 |  | Jackery Explorer 300 | 3.4/10 | 293 Wh | 300 W | 7.1 lb (3.2 kg) | Check price |
Common questions
How long will the C300 run a fridge?
See the table above. The figure assumes an average domestic fridge and a compressor running about a third of the time. A warm room, a full shelf of fresh shopping or a door that keeps opening all push the real duty cycle up and the run time down.
Can I add capacity later?
No. The maker's specification table lists this unit as not expandable. If you might need more capacity, buy larger now or choose a model designed to take a second battery.
What does the cycle rating promise?
That after 3,000 cycles to 80%, the pack still holds the stated share of its original capacity. It is a degradation threshold, not a failure point. Always note the endpoint when comparing against another maker: they do not all quote the same one.