Anker SOLIX C300 DC Review: A Power Station Without the AC

The Anker SOLIX C300 DC makes a bold bet: most of us do not actually need AC outlets from a portable power station. Our laptops, phones, tablets, cameras, drones, and even some lighting all charge over USB. By stripping out the AC inverter entirely, Anker delivers 288Wh of LiFePO4 power with four USB-C ports — including two at 140W PD 3.1 — in a package that weighs just 6.17 lbs and costs $199. It is not for everyone, but for the right user, it is one of the smartest power products on the market.

Key Specs at a Glance

• Capacity: 288Wh (90,000mAh)
• Max Output: 300W combined
• Weight: 6.17 lbs
• Battery Type: LiFePO4 (3,000+ cycles)
• Ports: 4 USB-C (2x 140W PD 3.1, 1x 100W, 1x 15W), 2 USB-A, 1 car outlet
• AC Outlets: None

Who Is It For?

Digital nomads, remote workers, content creators, and travelers who power their lives through USB. If your daily carry consists of a USB-C laptop, a phone, wireless earbuds, a camera, and maybe a portable monitor, the C300 DC handles all of it without the weight, cost, and efficiency loss of an AC inverter. It is also an excellent choice for international travelers who want to avoid carrying voltage converters. Students who work from coffee shops and libraries will appreciate the compact size and the ability to charge multiple devices simultaneously.

Four USB-C Ports With 140W PD 3.1

This is the C300 DC’s defining advantage. Two of the four USB-C ports support USB Power Delivery 3.1 at 140W — enough to fast-charge a MacBook Pro 16-inch at full speed. A third port delivers 100W, and the fourth provides 15W for smaller accessories. In practical terms, you can charge a laptop and a phone simultaneously at full speed with capacity to spare for two additional devices. No power bank on the market offers this combination of port count and power delivery. The Jackery Explorer 100 Plus has USB-C but tops out at lower wattages, and traditional power banks like the Anker Prime 27650 offer fewer ports at lower total capacity.

The Efficiency Advantage of Going DC-Only

Here is the engineering argument for ditching AC: every time a power station converts DC battery power to AC and then your device converts it back to DC, you lose 10 to 15% of the energy as heat. The C300 DC eliminates that entire conversion chain. When you charge a laptop over USB-C, power flows from the LiFePO4 cells through DC-to-DC conversion directly to your device at roughly 95% efficiency. That means the 288Wh battery delivers closer to 274Wh of usable energy compared to roughly 245Wh through an AC inverter. The practical result is longer runtime per charge. It also means less heat generation, which means less fan noise and a smaller, lighter enclosure. Anker made the C300 DC chargeable via any USB-C PD source as well — you can top it off from a USB-C wall adapter, a car charger, or even another power station.

Compact, Light, and Surprisingly Capable

At 6.17 lbs, the C300 DC is lighter than most laptops. It fits in a daypack, a messenger bag, or a camera case alongside your other gear. The build quality is what you expect from Anker’s SOLIX line — solid construction, a clear display, and well-spaced ports that accommodate wide charging bricks without blocking neighboring outlets. The 90,000mAh capacity gives you roughly 5 full laptop charges, 20+ smartphone charges, or 15+ hours of running a portable monitor. The car outlet adds compatibility with 12V accessories like tire inflators, car vacuums, and cooler fans.

What Could Be Better

The obvious limitation is the lack of AC outlets. You cannot run a blender, a CPAP machine (unless it has a DC adapter), a fan, or any appliance that requires a wall plug. This makes the C300 DC a complement to a traditional power station rather than a replacement. The 300W maximum combined output means charging two laptops at 140W each simultaneously is not possible — the unit will throttle to stay within its power budget. The 3,000+ cycle LiFePO4 rating is good but not exceptional, as competitors like the Jackery Explorer 600 Plus offer 4,000 cycles. There is no built-in solar charge controller, so connecting solar panels requires a separate MPPT controller or using a compatible Anker panel. At $199, it is more expensive per watt-hour than some budget power stations, though the premium materials and PD 3.1 ports justify some of that gap.

The Bottom Line

The Anker SOLIX C300 DC is a purpose-built power solution for the USB-C generation. By eliminating the AC inverter, it delivers better efficiency, lower weight, and more USB-C ports than any competitor in its class. The two 140W PD 3.1 ports are genuinely best-in-category, and the 288Wh LiFePO4 battery provides enough energy for a full day of laptop work and device charging. It is not a replacement for a full-featured power station — and it does not try to be. If your devices charge over USB, the C300 DC is the most efficient and elegant way to keep them powered on the go. If you need AC outlets, look at the Bluetti AC2A or EcoFlow RIVER 3 Plus instead.