EnginStar R300 Portable Power Station, 296Wh, 300W Pure Sine Wave AC

Fit and sizing

At 296Wh, the EnginStar R300 is a compact battery-powered station for bringing portable electricity to a campsite, RV, or travel setup. Its 300W AC output and pure sine wave outlets support compatible electronics and small devices, including laptops and cameras.

Two 110V AC outlets make it practical to power more than one suitable device from the same station. DC, USB, and USB-C outputs add options for gear that charges through those connections.

Need backup power that can work with different charging sources? The R300 can recharge from a wall outlet, a 12V car socket, or a compatible 12–25V solar panel, making it useful across home, vehicle, and outdoor routines.

Strengths

The pure sine wave AC output is designed for sensitive electronics, while the 300W rating gives you a straightforward way to check whether a device is within the station’s output range. For example, it can serve as a portable power source for a laptop at a campsite or provide backup for compatible CPAP equipment. Check the device’s operating wattage before connecting it, AC devices must draw less than 300W.

A digital display, flashlight, and LED indicator lights add practical functions when setting up or checking the unit in low light. Overload protection and battery-management safeguards are also listed, including protection against short circuits and overcharging. The battery is lithium-ion, and the manufacturer describes it as supporting more than 1,000 charge cycles.

A battery station offers a different approach from relying on a single USB power bank: the R300 combines AC outlets with DC and USB connections. That makes it easier to plan around a mix of electronics, provided each device is within the output requirements of its connection.

Key specifications

• Capacity: 296Wh / 80,000mAh
• AC output: 300W, 110V pure sine wave, 60Hz
• AC outlets: 2
• DC output: 12V/8A and 24V/3A
• USB output: 5V/3.1A
• USB-C output: Up to 18W
• Weight: 6.5 lb
• Charging: Wall outlet, 12V car socket, or compatible 12–25V solar panel
• Features: Digital display, flashlight, LED indicator lights, overload protection

Customers often highlight the portability and usefulness of the power output for outdoor setups. Feedback on charging speed and battery life is mixed, so plan around the wattage of your devices and the amount of power your setup needs. The stated runtime depends on the connected device’s consumption.

Before you decide

What can the R300 power? Devices connected to its AC outlets need to draw less than 300W. It also provides DC, USB, and USB-C outputs for compatible equipment, check the device’s input requirements and choose the matching connection.

How can I recharge it? Use a wall outlet, a 12V car socket, or a compatible 12–25V solar panel. The solar panel is sold separately, so choose one within that voltage range if you plan to recharge with solar power.

Can I use it with a CPAP machine? The product is presented for CPAP backup. Check the CPAP’s power requirements and any accessories you use, and keep the total AC demand below 300W.

Buying verdict

The EnginStar R300 suits campers, travelers, and households looking for a portable battery station with AC, DC, USB, and USB-C options in one unit. Its 296Wh capacity, pure sine wave outlets, and three charging methods make it a practical fit for compatible electronics and backup needs where portability and flexible recharging matter.