Drawing · 6.5 × 6.3 × 9.5 in · 9.1 lb
- Capacity
- 288 Wh
- AC output
- 300 W
- Surge
- 600 W
- Solar input
- 100 W
- Weight
- 9.1 lb
Maker price$329.99 at Anker SOLIX, sold out when checked Oct 11, 2026
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Anker SOLIX · Compact (under 600 Wh)
Anker SOLIX C300X
A compact unit, 288 Wh, 300 W (600 surge), $299.99 at Anker SOLIX, sold out when checked Oct 11, 2026 ($1.04 per Wh). By our sizing it holds phones and USB lights, but none of the six uses we size.
From the maker's published figures and our own calculations; we have not tested it ourselves.
Estimated runtimehours24-hour dial
Rated capacity
288 Wh
288 Wh × 0.85 ÷ device watts. An estimate, not a measured test. Startup and connections need checking.
Drawing
Anker SOLIX C300X $299.99 at Anker SOLIX, sold out when checked Oct 11, 2026
Capacity 288Wh
AC output 300W
Surge 600W
Chemistry LiFePO4
Rated cycles Not published
Weight Not published
Max solar input 100W
Price per Wh $1.04
Should you buy it?
Check first Anker SOLIX's store showed the C300X sold out on Oct 11, 2026; check it is back before you plan around it.
Not for: a day of home backup (too little capacity: needs 2,323 Wh and 1,351 W at startup); a night of CPAP (too little capacity: needs 599 Wh and 104 W at startup); two nights of camping (too little capacity: needs 2,066 Wh and 157 W at startup); a day in an RV (too little capacity: needs 648 Wh and 156 W at startup); a working day in a van (too little capacity: needs 1,674 Wh and 189 W at startup); a laptop and two phones (too little capacity: needs 396 Wh and 60 W at startup).
Choose it for a 5-year warranty against 2: $31 more than the Pecron E500LFP.
Choose the Pecron E500LFP instead if you want the most battery for the money: $0.47 per Wh against $1.04, $31 less; you give up warranty years (2 against 5).
Not published The maker publishes no rated cycle life and no weight.
About 245 Wh reaches the AC outlets after the 0.85 loss allowance (an estimate, not a measurement). At $1.04 per watt-hour, compare its cost with the charging speed and carry weight you need. We list 28 other models in its size class; the four nearest in capacity are compared below.
What it runs, and for how long
Hours = capacity × 0.85 ÷ device watts, with the draws from the device table.
| Device | Draw W | Hours | Output and surge cover it? |
|---|---|---|---|
| CPAP machine (no heated humidifier) | 45 | 5.4 | yes |
| CPAP machine (with heated humidifier) | 53 | 4.6 | yes |
| Refrigerator (full-size, ENERGY STAR, ~18 cu ft top freezer) (average draw, compressor cycling) | 41 | 5.9 | no |
| Laptop (MacBook Air, charging) (charger rating, continuous) | 40 | 6.1 | yes |
| Wi-Fi router | 24 | 10.2 | yes |
| Starlink Mini (router built in) | 33 | 7.5 | yes |
| TV, 50-inch LED / Crystal UHD | 89 | 2.8 | yes |
| Camp LED light set (4 chainable lights) | 6 | 38.9 | yes |
"Yes" means its continuous output covers the draw and its surge rating covers the startup figure we use, by arithmetic on ratings, not a test. Startup figures: the CPAP with its humidifier, 104 W at startup, from ResMed's peak figure; the refrigerator, 1,300 W startup allowance, from a larger 27 cu ft Whirlpool's tech sheet. Your own appliance's label or manual has its own.
Sockets and size
- AC outlets: count not published, 300 W in total, 600 W surge
- Three USB-C ports, up to 140 W from one port
- One USB-A port
- 12 V outlets: count not published
How many of each socket and their limits, from the maker's spec sheet; it does not say where each one sits on the unit.
At a glance
How it compares with the other 28 compact models, on the makers' figures. We don't boil it down to one score; see how we pick.
| What it can power | Covers none of the uses we size. Output and surge cover 13 of the 17 devices in our list, on the startup figures we use |
|---|---|
| Price per Wh | $1.04 per Wh, 22nd lowest of 29 compact units |
| Portability | Weight not stated |
| Recharge speed | 100 W of solar input: at least 2.9 hours of full sun at that limit to refill (an ideal minimum, not clock time); 0.8 h to 80% from the wall |
| Chemistry and cycle life | LiFePO4; cycle life not stated |
| Expandability | No expansion stated; 10 ms UPS switchover |
Full spec sheet
| Capacity | 288 Wh |
|---|---|
| Chemistry | LiFePO4 |
| Rated cycle life | – |
| Expandable | – |
| Continuous AC output | 300 W |
|---|---|
| Surge (peak) output | 600 W |
| AC outlets | – |
| USB-C ports / highest output | 3 / 140 W |
| USB-A ports | 1 |
| 12 V outputs | – |
| Wireless charging pad | – |
| UPS / EPS switchover | 10 ms |
| Max AC input | – |
|---|---|
| Wall recharge time | 50 min to 80% |
| Max solar input | 100 W |
| Stated solar recharge time | – |
| App control | yes |
| Weight | – |
|---|---|
| Dimensions | – |
| Wh per lb | – |
| Release year | – |
| Warranty | 5 years |
| List price | – |
|---|---|
| Store price | $299.99 at Anker SOLIX, sold out when checked Oct 11, 2026 |
| Price per Wh | $1.04 |
Before using the battery's cycle rating to judge value, read what LiFePO4 versus NMC means for lifespan and weight.
What the output figures mean for your devices: running and surge watts, and what a 10 ms switchover means if you use it as a UPS.
Which maker panels its solar input takes, how to wire them and the hours of sun to refill it: the C300X solar setup.
Alternatives at this size
Listed smallest to largest by capacity; this unit is among them.
Select up to three models to compare.
Drawing · 4.9 × 4.7 × 7.9 in · 6.2 lb
- Capacity
- 288 Wh
- AC output
- no AC outlet
- Surge
- Not published
- Solar input
- 100 W
- Weight
- 6.2 lb
Maker price$349.99 at Anker SOLIX, sold out when checked Oct 11, 2026
Drawing
- Capacity
- 288 Wh
- AC output
- 300 W
- Surge
- 600 W
- Solar input
- 100 W
- Weight
- Not published
Maker price$299.99 at Anker SOLIX, sold out when checked Oct 11, 2026
Drawing · 9.8 × 7 × 6.6 in · 9.5 lb
- Capacity
- 288 Wh
- AC output
- 600 W
- Surge
- Not published
- Solar input
- 200 W
- Weight
- 9.5 lb
Maker price$279.99 at BLUETTI, checked Oct 9, 2026
Drawing · 11.3 × 7.3 × 7.7 in · 11 lb
- Capacity
- 288 Wh
- AC output
- 600 W
- Surge
- 1,200 W
- Solar input
- 200 W
- Weight
- 11 lb
Maker price$349 at EcoFlow, checked Oct 11, 2026
No models match these filters.
| Model | Wh | Output W (surge) | lb | Solar input W | Chemistry | Cycles | Price at maker $ | Price per Wh | Store |
|---|---|---|---|---|---|---|---|---|---|
| Anker SOLIX C300 | 288 | 300 W (600 surge) | 9.1 | 100 | LiFePO4 | 3,000 to 80% | $329.99sold out when checked Oct 11, 2026 | $1.15 | See it at Anker SOLIX Check price on AmazonAmazon's price may differ |
| Anker SOLIX C300 DC | 288 | no AC outlet | 6.2 | 100 | LiFePO4 | 3,000 to 80% | $349.99sold out when checked Oct 11, 2026 | $1.22 | See it at Anker SOLIX Check price on AmazonAmazon's price may differ |
| Anker SOLIX C300X | 288 | 300 W (600 surge) | – | 100 | LiFePO4 | – | $299.99sold out when checked Oct 11, 2026 | $1.04 | See it at Anker SOLIX |
| BLUETTI Elite 30 V2 | 288 | 600 W | 9.5 | 200 | LiFePO4 | 3,000 to 80% | $279.99checked Oct 9, 2026 | $0.97 | See it at BLUETTI Check price on AmazonAmazon's price may differ |
| EcoFlow RIVER (original) | 288 | 600 W (1,200 surge) | 11 | 200 | Lithium-ion (type not stated) | 500 to 80% | $349checked Oct 11, 2026 | $1.21 | See it at EcoFlow |
See it at Anker SOLIX Every Anker SOLIX model we cover Does it hold enough for your devices?
Before connecting panels, compare your array's cold-morning open-circuit voltage and short-circuit current with this model's solar-input limits in its manual.
Sources
- Specs: Anker SOLIX product page
- Price: Anker SOLIX product page, checked Oct 11, 2026
- How the figures and picks are made