Briggs & Stratton 3,700W Gas Generator Review

Summary

The Briggs & Stratton 30814 P4500 PowerSmart is a gasoline inverter generator that delivers 3,700 running watts and 4,500 starting watts. That output sits in a practical sweet spot for homeowners and outdoor users alike. At 3,700 watts of continuous power, this unit can run a refrigerator, a sump pump, several lights, a phone charger, and a window AC unit simultaneously during an outage. It will not power a full house, but it handles the essentials without breaking a sweat.

Because this is an inverter unit, the electricity it produces is cleaner and more stable than what a conventional open frame generator delivers. That distinction matters for anyone plugging in a laptop, a flat screen TV, or medical equipment. The Briggs & Stratton name also carries weight here. The company has been building small engines for over a century, and the P4500 reflects that lineage with a feature set focused on usability and electronic safety.

Power & Runtime

Running on gasoline, the P4500 draws from a 3.5 gallon fuel tank. At 25% load, which translates to roughly 925 watts of draw, the generator runs for 16 hours on a single fill. That is an overnight runtime with room to spare. Users keeping a few lights on, charging devices, and running a small fan could easily sleep through the night without touching the fuel cap. Heavier loads will shorten that window considerably, so running a space heater or a large appliance will mean more frequent trips to the gas can.

Noise output sits at 60 dBA. For context, that is roughly the volume of a normal conversation. Place this generator 20 to 25 feet from a tent or a bedroom window and it fades into comfortable background noise. It will not wake the neighbors. It will not drown out a campsite conversation. That makes it a realistic option for residential neighborhoods with close property lines and for campgrounds with enforced quiet hours.

The 3% total harmonic distortion rating is where the inverter technology really pays off. Standard generators can produce THD levels above 20%, which introduces voltage spikes and irregularities that can damage microprocessors and circuit boards over time. At 3%, the P4500 outputs power clean enough to safely charge a MacBook, run a CPAP machine, or keep a gaming console running without worry. Sensitive electronics stay protected.

Outlets

The P4500 comes with four NEMA 5-20R outlets, all rated at 120V and 20 amps. These are standard three-prong household receptacles, the same type found on nearly every wall in a North American home. This means users can plug in everyday items like phone chargers, lamps, fans, power tools, and kitchen appliances without any adapters. Four outlets give enough room to distribute the 3,700 running watts across multiple devices at once, though users should monitor total draw to avoid tripping the overload protection.

There are no 240V outlets on this unit. That rules out powering large appliances like a central air conditioner, an electric dryer, or a full house transfer switch that requires 240V service. For users whose needs center on 120V household essentials, the four 5-20R outlets will handle the job well. The outlets are covered, which keeps dust, rain, and debris out of the receptacles during storage and outdoor use.

Portability

At 104 pounds, the P4500 is not a unit you casually toss into a truck bed. Lifting it solo requires a firm grip and a decent amount of strength, and getting it up a set of stairs or into a raised vehicle will likely call for a second pair of hands. This weight places it in a middle ground. It is lighter than many 4,000 watt class conventional generators, but it is far from the grab and go portability of a 2,000 watt inverter.

The physical footprint measures 24.5 inches long, 17.6 inches wide, and 20.36 inches tall. That is compact enough to fit in the corner of a garage, the back of an SUV, or on a trailer alongside camping gear. Storage planning is straightforward since the unit does not demand a large dedicated space. Still, the combination of weight and dimensions means users should think about where they plan to stage the generator before they need it. Having it already positioned near a garage door or a patio outlet panel saves effort when the power goes out at 2 AM.

Features

Starting the P4500 is about as easy as it gets. Three options are available: a traditional recoil pull, an electric push button start, and a wireless remote start. The remote start is a genuine convenience upgrade. Users can fire up the generator from inside the house or from across a campsite without walking over to the unit. Cold morning startups and middle of the night outages become far less of a hassle.

On the safety and protection side, the generator includes automatic voltage regulation, which stabilizes the electrical output and prevents voltage spikes from reaching connected devices. A spark arrestor is built in, making the unit safe for use in forested areas and on public lands where fire risk regulations apply. GFCI protection on the covered outlets guards against ground faults, a critical safety layer when operating in wet or damp conditions. The unit meets both CARB and EPA compliance standards, so it is legal to sell and operate in all 50 states, including California.

A fuel gauge and onboard indicators give users real time visibility into fuel level and operating status. No guessing when the tank is getting low. No wondering if the unit is overloaded. These readouts reduce the chance of an unexpected shutdown during critical use. The 3 year warranty backs the purchase with a defined period of manufacturer support, covering defects and giving buyers confidence that Briggs & Stratton stands behind the product through its early ownership years.

Recommended Audiences

• Owners of sensitive electronics seeking clean inverter power with 3% THD protection for laptops, TVs, and medical devices
• Shoppers who prefer gasoline powered generators for the convenience of widely available fuel
• Homeowners needing emergency backup for essential circuits like refrigerators, sump pumps, and lighting
• Noise sensitive users or those in campground environments where 60 dBA operation keeps the peace
• Users who value push button or remote start convenience to eliminate the hassle of a recoil pull cord