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Inverter generator · dual fuel In stock · ships from Dallas

GENMAX GM4500iSAD 4500W Peak Dual-Fuel Silent Inverter Generator

4,500-watt dual-fuel inverter with a 145cc engine, CO detection, and a published weight of 49.2 lb.
5.0 (4 reviews)
$539.40 $1,099.00 SAVE $559.60 (51% OFF)
In stock · ready to ship Ships tomorrow Order today and it leaves our Dallas, TX warehouse tomorrow.
Tracking number sent by email as soon as the freight carrier picks up your order.
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Starting watts
4,500 W
On gasoline
Running watts
4,000 W
On gasoline
Fuel
Dual fuel
Gasoline, Propane
Weight
49.2 lb
Overview

Small enough to lift into a car.

GENMAX lists the GM4500iSAD at 49.2 lb, with a 145cc engine. It makes 4,500 starting and 4,000 running watts on gasoline, and 4,000 starting and 3,600 running watts on propane. The case is 19.1 by 11.2 by 17.9 inches. It has a CO sensor and is EPA compliant. The box includes an LPG hose, an oil funnel, a spark-plug wrench, a screwdriver, and a USB adapter.

  • 49.2 lb Published unit weight.
  • CO sensor Built in.
  • LPG hose included Plus the usual tool kit.
GENMAX GM4500iSAD 4500W Peak Dual-Fuel Silent Inverter Generator
GENMAX GM4500iSAD — Gasoline power
GENMAX GM4500iSAD · Feature 1

Gasoline power

4,500 starting watts and 4,000 running watts on gasoline.

GENMAX GM4500iSAD — Propane power
GENMAX GM4500iSAD · Feature 2

Propane power

4,000 starting watts and 3,600 running watts on propane.

GENMAX GM4500iSAD — Compact cabinet dimensions
GENMAX GM4500iSAD · Feature 3

Compact cabinet dimensions

19.1 × 11.2 × 17.9 in

GENMAX GM4500iSAD

Specifications

Figures for this model. If you need a detail that isn’t listed, ask us and we’ll check before you order.

Ask about this model
Model GENMAX GM4500iSAD
Type Inverter generator
Fuel Gasoline, Propane
Starting watts 4,500 W gasoline / 4,000 W propane
Running watts 4,000 W gasoline / 3,600 W propane
Engine 145cc 4-stroke OHV
Weight 49.2 lb
Dimensions 19.1 × 11.2 × 17.9 in
Safety CO sensor
Compliance EPA
Warranty 3-year limited, per GENMAX
GENMAX GM4500iSAD

What’s included

These come with the machine.

Customer reviews

Reviews from GENMAX GM4500iSAD owners.

5.0
Based on 4 reviews
5
100% (4)
4
0% (0)
3
0% (0)
2
0% (0)
1
0% (0)

Customer photos (3)

Runs whole house including 4-ton AC without flinching
Mark R.
Runs whole house including 4-ton AC without flinching
Clean freight delivery and great build quality
David M.
Clean freight delivery and great build quality
Fuel versatility is a complete lifesaver
Travis H.
Fuel versatility is a complete lifesaver
MR
Mark R.
Tyler, TX
October 24, 2026
★★★★★

Runs whole house including 4-ton AC without flinching

Ordered the GENMAX GM4500iSAD 4500W Peak Dual-Fuel Silent Inverter Generator after getting tired of sitting in the dark during Gulf storms. Freight delivery arrived on a liftgate truck right onto my concrete driveway. Hooked it into our manual transfer switch with a 50A cord and ran our central 4-ton AC, two refrigerators, well pump, and all household lights. Electric start fired right up on propane.
Review photo from Mark R.
DM
David M.
Broken Arrow, OK
October 12, 2026
★★★★★

Clean freight delivery and great build quality

Driver called me 24 hours ahead of time to coordinate delivery. Unit was bolted onto a heavy pallet and wrapped securely. Added oil, connected a 100-lb propane tank, and pushed the start button. Purrs like a kitten and the digital meter makes monitoring voltage and hours simple. Couldn't ask for a better machine at this price point.
Review photo from David M.
TH
Travis H.
Ocala, FL
September 28, 2026
★★★★★

Fuel versatility is a complete lifesaver

The tri-fuel capability was the main selling point for me. Being able to connect directly to our residential natural gas line means no more storing 50 gallons of stale gasoline in the garage. Build quality is solid industrial grade and the frame feels bulletproof.
Review photo from Travis H.
GW
Gary W.
Marysville, OH
September 15, 2026
★★★★★

Remote start key fob works from inside the house

Tested the wireless remote start from about 80 feet away through the back patio door—started immediately. It is surprisingly quiet for an engine of this displacement. Very impressed with the packaging and complete hardware kit included.
GENMAX GM4500iSAD

Questions and answers

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What fuels does the GM4500iSAD run on?

It runs on gasoline (4,500 W starting, 4,000 W running) and propane (4,000 W starting, 3,600 W running).

How much does it weigh?

GENMAX lists the unit weight at 49.2 lb.

How does delivery work?

Delivery is free to residential addresses. Orders ship from our Dallas, TX warehouse, and larger items arrive by freight with a liftgate drop at your curb or driveway. You get a tracking number by email as soon as the carrier picks up your order.

$539.40 Free delivery
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