Aceup Energy 4000W Peak Portable Inverter Generator
3.9Best price now
$409.99at WalmartVerified
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The Aceup Energy AI4000S-1 is a gasoline inverter generator rated at 3200 running watts and 4000 peak watts, built around a 149cc 4-stroke OHV engine. It weighs 50.7 lb and is fully enclosed, with a claimed 55 dB noise level and up to 5 hours of runtime at half load. It starts with a pull cord and offers 120V AC, 12V DC and USB outlets. At $409.99 at Walmart as of November 5, 2026, it is the only new price listed, so there is no recent range to compare it against.
In stockSold by Aceup EnergyReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.
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Lowest price we've seen: $409.99 on Nov 5 at Walmart. Tracked across 1 store since Nov 5.
Ratings average 3.9 out of 5 from 100 buyers, so most are satisfied but a notable share are not. Owners tend to like the light weight and quiet running; complaints center on starting and outlet count.
The Aceup Energy AI4000S-1 portable inverter generator delivers powerful and reliable performance with its 149cc 4-stroke OHV engine that produces 4000 peak watts and 3200 rated watts. Weighing only 50.7 pounds, this generator features a fully-enclosed design that reduces noise to a quiet 55dB, making it ideal for use in RV parks, camping, or emergency backup power. With a runtime of up to 5 hours at half-load, the AI4000S-1 includes a variety of outlets, including 120V AC, 12V DC, and USB, to power a range of devices and appliances. Backed by a 1-year limited warranty and EPA compliance, this generator is a versatile and dependable choice for your power needs.
