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Who makes the best inverter generator is the wrong question to start with, because no single maker wins every job: the right maker is the one whose generator matches the loads you plan to run, the noise you can live with, and the run time you need. Fuel generators run outdoors only, far from doors and windows, because of carbon monoxide. The sections below compare what Oxseryn, Westinghouse and PowerSmart state for their generators, then show how to pick by watts, noise and run time.
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The quick answer: who makes the best inverter generator
Start from the loads, not the brand. A small camping setup runs on a generator that states 2000 running watts, while a home backup setup needs far more, and the listings in this guide state running watts from 2000 to 9500. Noise, run time and warranty separate makers that look alike on watts alone, so compare those figures before choosing a brand.
| Maker and model | Running watts stated | Noise stated | Run time stated |
|---|---|---|---|
| Oxseryn 2800 watt | 2000 | Under 58 dBA from 23FT | Up to 9 hours at 25% load |
| Oxseryn 4400 watt | 3400 | Under 72 dBA from 23FT | Up to 14 hours at 25% load |
| PowerSmart 3800 watt | 3200 | 59 dBA from 23 feet | Not stated |
| Westinghouse 12500 watt | 9500 on gasoline, 8500 on propane | Not stated | Up to 12 hours |
Peak watts run higher than running watts on every listing here: 2800, 3800, 4400 and 12500. Use running watts for the loads you plan to carry, and treat peak watts as the short surge a motor needs to start.
Step 1: Match running watts to the loads
Running watts, not peak watts, decide what a generator can carry. The listings state 2000, 3200, 3400 and 9500 running watts on gasoline, with Westinghouse stating 8500 running watts on propane. Add the running watts of the loads you plan to run at the same time, and leave headroom for the startup draw of motors and compressors. Clean power matters for electronics: PowerSmart and Oxseryn both state THD under 3%, which suits laptops, phones and tablets. See what size generator to take camping for a worked example.
Step 2: Compare noise and run time
Noise is stated at a distance, so compare like with like: Oxseryn states under 58 dBA from 23FT for its 2800 watt generator and under 72 dBA from 23FT for its 4400 watt generator, while PowerSmart states 59 dBA from 23 feet for its 3800 watt generator. Westinghouse states no noise figure for its 12500 watt generator. Run time depends on load: Oxseryn states up to 9 hours at 25% load for the 2800 watt generator and up to 14 hours at 25% load for the 4400 watt generator, from a 1.1 gallon tank and a 2 gallon tank. Westinghouse states up to 12 hours. ECO mode stretches run time at light loads, and both Oxseryn listings state it.
Step 3: Check outlets, weight and warranty
Outlets decide what plugs in without adapters: Oxseryn states 2 120V AC ports, a 12V DC port and an RV port on the 4400 watt generator, and adds a USB port and a Type-C port on the 2800 watt generator. PowerSmart states a 120V 20A duplex, a 120V 30A twist-lock, a 12V 8A DC outlet and dual 5V 2.1A USB ports. Westinghouse states two GFCI 120V 20A household outlets, a 120V 30A outlet and a 120/240V 50A RV outlet. Weight matters when the generator moves: the inverter generators in this guide state 40 lbs, 47 lbs and 56 lbs, with Westinghouse stating no weight. Oxseryn states 40 lbs in the bullets and spec table for its 2800 watt generator, while the title says 39 lbs, so the listing disagrees with itself on weight. Warranty cover varies too: Oxseryn states a 1 year manufacturer warranty, PowerSmart states a 2-year limited warranty plus free lifetime expert technical support, and Westinghouse states 3-year limited service, labor and parts coverage.
Ways to narrow the maker list
- Size by running watts: the listings in this guide state 2000 to 9500 running watts on gasoline, so pick the size that covers the loads you plan to run at the same time.
- Weigh noise against power: the lowest stated noise figure here is under 58 dBA from 23FT, while the loudest is under 72 dBA from 23FT, so a bigger generator is not always the quieter one.
- Check fuel and tank: Westinghouse runs on gas and propane, while the Oxseryn 2800 (on Amazon) runs on gas with a 1.1 gallon tank and a fuel indicator.
- Read the warranty: Oxseryn states 1 year, PowerSmart states 2 years plus free lifetime expert technical support, and Westinghouse states 3 years of limited service, labor and parts coverage.
- Plan for altitude: Oxseryn states that above 4000 feet, about 1200 meters, a high-altitude kit is recommended for its 2800 watt generator.
FAQ: power away from the grid
Who makes the best inverter generator?
No single maker wins every job. Oxseryn states the lowest noise figures here, PowerSmart states clean power with THD under 3% at a mid size, and Westinghouse states the highest running watts. Pick by running watts, noise, run time and warranty, not by brand alone.
How many running watts do I need?
Add the running watts of the loads you plan to run at the same time, then leave headroom for startup draw. The listings in this guide state 2000 to 9500 running watts, so the range covers a small camping setup up to a home backup setup.
Are inverter generators quiet?
It depends on the model. The listings here state under 58 dBA from 23FT, 59 dBA from 23 feet and under 72 dBA from 23FT, while Westinghouse states no noise figure for its 12500 watt generator. Compare figures stated at the same distance.
How long will an inverter generator run on a tank?
It depends on the tank and the load. Oxseryn states up to 9 hours at 25% load from a 1.1 gallon tank and up to 14 hours at 25% load from a 2 gallon tank, while Westinghouse states up to 12 hours.
Can an inverter generator run indoors?
No. PowerSmart states never to use a generator indoors or in partially enclosed areas, and to use it outdoors only. Fuel generators run outdoors only, far from doors and windows, because of carbon monoxide.
Related solar guides
See the benefits of an inverter generator, how long a gas generator runs and how long a portable generator lasts.
