Find the best open frame inverter generator for your needs. Our guide compares top picks like Westinghouse, PowerSmart, GENMAX, and Oxseryn for power, value
Why you should trust this guide
This buying guide is based on a careful analysis of the product features, specifications, and customer feedback available for the top open frame inverter generators on the market. I have focused on the real specifications provided by manufacturers and verified through major retail listings to ensure accuracy. My goal is to help you make an informed decision by comparing power output, runtime, portability, and special features across these five models.
I have not physically tested these generators in a lab, but I have cross-referenced the listed features with common user needs and industry standards for inverter generators. The recommendations are grounded in the data provided, such as wattage, THD levels, fuel capacity, and outlet types, to match different use cases from home backup to camping.
How we evaluated
I evaluated each generator based on key criteria that matter most to buyers: power output (peak and running watts), fuel efficiency and runtime, noise level, portability (weight and size), and special features like remote start, electric start, or multi-fuel capability. The Westinghouse 10000 stood out for its high power and low THD, while the PowerSmart models offered strong value and premium features respectively.
I also considered the number and type of outlets, including 120V, 240V, and RV-ready ports, as well as safety features like GFCI outlets and low oil shutdown. The GENMAX tri-fuel option was evaluated for its fuel flexibility, and the Oxseryn for its lightweight design. Each pick is matched to a specific buyer profile to simplify your choice.
What to look for
- Power output: Match the generator’s running and peak watts to the appliances you need to run. Inverter generators provide clean power for sensitive electronics.
- Fuel type and runtime: Consider gasoline, propane, or tri-fuel options. Larger fuel tanks offer longer runtime, which is critical for extended outages or camping.
- Noise level: Look for decibel ratings (e.g., 70-76 dB) to ensure quiet operation, especially for camping or residential use.
- Portability: Weight and handle/wheel design affect how easily you can move the generator. Lighter models (under 60 lbs) are better for travel.
- Start method: Remote start, electric push-button, or recoil start. Electric or remote start adds convenience, especially in cold weather.
- Outlets and voltage: Ensure you have enough 120V outlets, a 30A RV port, or 240V capability for your specific needs.
- Safety and compliance: EPA compliance, low oil shutdown, and GFCI outlets are important for safe operation and legal use.
How we test
We base every pick on real-world use, published manufacturer specifications and verified owner feedback. We compare the tools on the things that actually matter for your lawn, power, runtime, cut quality, build and value, and we never accept payment for a ranking. When we have not used a specific model first-hand, we say so.