WEN 56477i vs Briggs & Stratton P4500 PowerSmart

Comparison Overview

Analysis by AJ Quick

Mechanical engineer and founder of RightGenerator

Key takeaways

• WEN 56477i produces 4000 running watts, 300 more than the Briggs & Stratton P4500
• Briggs & Stratton P4500 runs up to 16 hours at 25% load for extended outages
• WEN 56477i weighs just 72.7 pounds, over 31 pounds lighter than the P4500
• Briggs & Stratton P4500 operates at 60 dB, slightly quieter than the WEN's 62 dB
• Both are inverter generators with clean power safe for sensitive electronics
• Both carry a 3-year warranty and run on gasoline

Best use cases

Choose the WEN 56477i if you need more power in a lighter package. At 4000 running watts and under 73 pounds, it's one of the more portable options in this wattage class. If you're hauling a generator to a tailgate, loading it into an RV compartment, or carrying it across a job site, that weight savings is significant. The higher wattage also gives you more headroom for running a small air conditioner alongside a few other devices, or powering demanding tools without worrying about overload. It's a solid choice for weekend camping trips, outdoor events, or light home backup where you want to keep things manageable.

Choose the Briggs & Stratton P4500 PowerSmart if extended runtime is your top concern. With 16 hours at 25% load, this generator can run through the night on a single tank, which is a huge advantage during power outages when you want to keep a refrigerator, a few lights, and a phone charger going without refueling at 3 a.m. The slightly lower noise level of 60 dB also makes it a better neighbor-friendly option during prolonged use. Briggs & Stratton is a well-established name in outdoor power equipment, which can make finding parts and service easier down the road.

The tradeoff is clear: the P4500 weighs 104 pounds, making it considerably harder to move around without a wheel kit or a second pair of hands. If your generator mostly stays in one spot (like a patio or garage entrance during storms), the weight is less of an issue. But if you're frequently transporting it, the WEN's lighter build is a practical advantage that's hard to ignore. Both generators produce inverter-quality power, so sensitive electronics like laptops and medical devices are safe with either option.

Verdict & recommendation

If your priority is maximum power with minimum weight, the WEN 56477i is the stronger pick. It gives you 300 more running watts while weighing over 30 pounds less, which is a compelling combination for anyone who moves their generator frequently. If your priority is long, uninterrupted runtime with slightly quieter operation, the Briggs & Stratton P4500 PowerSmart earns its place with that 16-hour runtime figure and a trusted brand reputation.

Neither generator is a bad choice. They share the same fuel type, inverter technology, and warranty coverage. The real question comes down to how you plan to use it: on the move or in one place for hours on end. Match the generator to your most common scenario, and you'll be happy with either one.