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Simpson SGS3543 Generator 3500/4375W Inverter Gasoline with CO Sensor New
Simpson SGS3543 Generator 3500/4375W Inverter Gasoline with CO Sensor New - view 2
Simpson SGS3543 Generator 3500/4375W Inverter Gasoline with CO Sensor New - view 3
Simpson SGS3543 Generator 3500/4375W Inverter Gasoline with CO Sensor New - view 4

SimpsonModel SGS3543

Simpson SGS3543 Generator 3500/4375W Inverter Gasoline

  • Peak4,375W
  • Running3,500W
  • FuelGasoline
Black Friday price
$529.00

Price from December 1: $609.00

Black Friday price ends in —

In stock Ships within 24 hours

Free delivery Wed, Nov 18 – Mon, Nov 23 if you order today, by UPS or FedEx Ground to your door.

Not available in California. This model is not CARB certified, so we cannot ship it to a California address.

  • Free shipping48 states + DC
  • 30-day returnsReturn shipping on us
  • Full warrantyBrand-new, from the maker
  • Secure checkoutEncrypted by Stripe
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Questions before you buy? Our small team in New York answers every message personally. Email support@acrepower.com

The Simpson SGS3543 is a portable inverter generator designed to deliver quiet, reliable power for home backup, RV use, tailgating, jobsites, and outdoor events.

Running watts
3,500 W
Starting watts
4,375 W
Fuel
Gasoline
Safety
CO shutdown sensor
SKU: SGS3543
Category: , ,

The Simpson SGS3543 is a portable inverter generator designed to deliver quiet, reliable power for home backup, RV use, tailgating, jobsites, and outdoor events. Its 4,375 starting watts and 3,500 running watts provide clean, stable electricity suitable for sensitive electronics like laptops, phones, and medical devices without risk of voltage spikes. A compact 55 lb. design and 1.2-gallon fuel tank make it easy to transport and operate. Integrated CO monitoring and GFCI-protected outlets add an extra layer of user safety.

Not for sale in California.

Full specifications

BrandSimpson
ModelSGS3543
Running watts3,500 W
Starting watts4,375 W
FuelGasoline
SafetyCO shutdown sensor
UPC / GTIN636893450167
How it shipsUPS or FedEx GroundTo your door, free
Order today, deliveredWed, Nov 18 – Mon, Nov 23Leaves our warehouse within 24 hours

Tracking is emailed as soon as it ships.

We ship to the 48 contiguous states and Washington, DC. Shipping details · 30-day free returns

Brand-new, with the full manufacturer’s warranty. The terms are set by Simpson and included in the box. If something goes wrong, contact us first: we confirm the next steps within 2 business days and help you file the claim.

How warranty claims work

What it can run

3,500 W running, 4,375 W starting

Pick what you want to power at the same time.

Typical wattages - check the label on your own appliances. Where only one figure is published, running watts are estimated at 80% of the starting figure. Connect to house circuits only through a transfer switch or interlock fitted by a licensed electrician.

Compare similar generators

Same power class, side by side.

SpecificationSimpson SGS3543 Generator 3500/4375W Inverter Gasoline with CO SensorThis generator$529.00All Power America APG3500IS 3500W/4300W Inverter Gas Recoil Start Generator$569.00A-iPower GXS4300i 3450W/4300W Generator Gas Low THD Inverter CO Alert$459.00
Running watts3,500 W3,500 W3,450 W
Starting watts4,375 W4,300 W4,300 W
FuelGasolineGasolineGasoline
Start—Recoil—
SafetyCO shutdown sensor—CO shutdown sensor
LinkYou are hereView →View →

Questions and answers

Answered by our team in New York. Can’t find yours? Ask below.

Can I connect this generator to my house?
Only through a transfer switch or an interlock kit installed by a licensed electrician. Never plug a generator into a wall outlet: it can back-feed the utility line and endanger line workers. Connecting safely.
What can it run at the same time?
Use the What it can run planner above: tick your appliances and it checks both the running load and the start-up surge against this generator.
Does it ship with oil?
It depends on the manufacturer. If oil is included it is listed under What’s in the box; otherwise use the grade given in the owner’s manual before the first start.
Can I use it in the rain?
Not uncovered. Run it on a dry surface under an open, canopy-like cover, at least 20 feet from doors, windows and vents, and never in a garage.
Can it be shipped to California?
Some generators are not certified for sale in California (not CARB compliant). If the description says this model is not for sale in California, we cannot ship it to a California address.
How will it be delivered?
Free, by UPS or FedEx Ground to your door, usually within 2–5 business days after it ships. Tracking is emailed as soon as it ships.
What if it arrives damaged?
Photograph it and email us within 48 hours of delivery. We replace or refund damaged items at no cost to you.
Ask a questionWe reply personally by email.

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