Anker SOLIX C300 DC Review (2026): The DC-Only Trade-Off, Explained
Affiliate disclosure: This post contains affiliate links. As an Amazon Associate I earn from qualifying purchases. Product picks were chosen on the merits — no brand pays for placement.
How we evaluated: WildJoule has not bench-tested this unit. Every figure below was read from Anker’s published specification and the current Amazon listing on the date shown at the end of this review. Verify the listing before buying.
This Anker SOLIX C300 DC review is for the buyer who has found a 288Wh LiFePO4 unit at a surprisingly small size and wants to know what those two letters cost them. The short answer: an AC outlet, and the wall charger. Everything else about it is genuinely good.
Quick verdict
The short version of this Anker SOLIX C300 DC review: the unit holds 288Wh of LiFePO4 with 300W of output spread across seven DC ports — two 140W USB-C, one 100W USB-C, one 15W USB-C, two 12W USB-A and a 120W car socket. There is no AC outlet and no wall charger in the box. If everything you run charges over USB-C or a 12V socket, this is one of the most sensible small power stations on the market. If you need to plug in a single household appliance, buy the plain C300 instead.
A short note on where I’m standing: I haven’t owned this unit and I’m not going to pretend I carried it up a mountain. What I bring is years spent somewhere the power comes and goes without warning, which is what made small, dependable batteries interesting to me in the first place. Everything below is read from Anker’s published figures and the listing, with the reasoning about what those figures mean marked clearly as mine.
Anker SOLIX C300 DC specs at a glance
| Spec | Anker SOLIX C300 DC |
|---|---|
| Capacity | 288Wh (90,000mAh) |
| Chemistry | LiFePO4 |
| Total output | 300W (DC only) |
| AC outlets | None |
| Ports | 2× USB-C 140W, 1× USB-C 100W, 1× USB-C 15W, 2× USB-A 12W, 1× car socket 120W |
| Recharge | USB-C in; ~80% in 1 hour at full input |
| Wall charger included | No — supply your own USB-C PD charger |
| Solar input | Up to 100W |
| Warranty | 3 years (Anker stated) |
What the Anker SOLIX C300 DC actually is
It is a very large USB-C power bank with a car socket bolted on. That sounds dismissive; it isn’t. 288Wh is roughly ten times a big phone power bank, it uses LiFePO4 rather than the NMC cells most banks use, and the two 140W USB-C ports are fast enough to charge a modern laptop at full speed while something else runs off the second one.
What it is not is an inverter. There is no AC outlet, which means no 120V household plug of any kind — not for a CPAP with a wall brick, not for a small fan, not for a camera battery charger with a two-prong plug. Anker sells a near-identical unit called simply the C300 with two AC outlets, and confusing the two is the single most common mistake with this product. If you are unsure which you are looking at, check the port list, not the name.
What 288Wh will actually run
Take about 85–90% of the rated capacity as realistically usable after conversion losses, so call it roughly 250Wh in the hand. A 60Wh laptop battery is four full charges. A 12–14Wh phone is fifteen-plus. A 12V compressor cooler drawing an average 30W over a duty cycle gets you eight hours or so, and a string of camp lights barely registers.
Where it stops making sense is anything with a heating element or a motor. Those live on AC, they draw hundreds of watts, and 288Wh would be gone in minutes even if there were an outlet to plug them into. That boundary is the whole product: the Anker SOLIX C300 DC is built for electronics, not appliances.
Charging it: the part the box does not include
There is no wall charger supplied. Anker states you need an 18W or higher USB-C charger just to wake the unit for the first time, and that only two of the USB-C ports accept input. To reach the advertised charging speed you need to feed both 140W ports at once — 280W of USB-C chargers, which most people do not already own.
That is a real cost, and it is easy to miss when comparing this against a unit that ships with a brick. On the other hand, if you already travel with a decent 100W laptop charger, you carry one charger instead of two, and the unit will happily top up from a car socket or a panel — solar input is capped at 100W, so a 100W folding panel is the sensible match rather than anything larger.
Best for: photographers, laptop-and-phone remote workers, bikepackers and anyone whose whole kit is USB-C or 12V. Also a sensible second battery to sit alongside a bigger AC unit.
Skip if: you need to plug in anything with a household plug, you want a unit that arrives ready to charge from the wall, or you are sizing for medical equipment — a CPAP needs AC or a dedicated DC lead, so start with our CPAP backup sizing guide instead.
Price: Prices on Amazon change frequently. Use the button below to check current pricing.
How the Anker SOLIX C300 DC compares
Against the EcoFlow River 3 Plus, the C300 DC has slightly more stored energy but no AC output at all, so they are not really rivals — the River 3 Plus wins the moment you need a plug, and loses on size and USB-C speed. Against the Bluetti AC70 it is not a fair fight: the AC70 holds 768Wh and delivers 1,000W of pure sine, and it weighs about four times as much.
The honest framing is that this belongs one tier below the units in our best power stations under $500 round-up rather than among them. If you want the broader map of how capacity, output and chemistry fit together before choosing, the complete guide to portable power stations covers it, and using a power station while tent camping is the closest real use case for a unit this size. For context on what LiFePO4 chemistry buys you in cycle life, the US Department of Energy’s National Renewable Energy Laboratory publishes the underlying research.
Anker SOLIX C300 DC review: buy it or skip it?
The conclusion of this Anker SOLIX C300 DC review is straightforward. Buy it if your gear is genuinely all USB-C and 12V, and you value the size. LiFePO4 in this class is still not universal, the three-year warranty is longer than most, and 300W across seven ports means you are rarely waiting your turn to charge something.
Skip it if there is any chance you will want a wall socket. The gap between this and the AC version is not a specification detail — it is the difference between a device charger and a power station. And budget for a USB-C charger on top, because the box will not solve that for you.
Frequently asked questions
Does the Anker SOLIX C300 DC have an AC outlet?
No. The DC model has seven ports — four USB-C, two USB-A and a 12V car socket — and no household outlet. The separate C300 model does include AC outlets.
Why is there no wall charger in the box?
Anker ships it charger-free and expects you to use a USB-C PD charger you already own. An 18W or higher unit is enough to activate it; two 140W chargers are needed for the fastest quoted recharge.
Can it run a CPAP machine?
Only if your machine has a 12V DC lead that matches the car socket, and even then 288Wh is tight for a full night with humidification. A unit with AC output and more capacity is the safer choice.
What size solar panel suits it?
Solar input is capped at 100W, so a 100W folding panel is the match. Anything larger is wasted on this unit — the extra watts simply will not be accepted.
This Anker SOLIX C300 DC review was last updated on September 11, 2026. Specifications are manufacturer-stated, read from Anker’s published product information and the current Amazon listing on this date. We do not display live prices or star ratings.
