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AMERISUN 4500W Open Frame Inverter Generator, 3800 Running Watts, Portable Gas Generator
$256.19
Final price set by Amazon · may vary
Amazon customer rating: 4.4 / 5 - WC Safety review of the AMERISUN 4500W Open Frame Inverter Generator, 3800 Running Watts, Portable Gas Generator. Written by Steven Eaton, WC Safety Editorial, from the published AM...
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Amazon customer rating: 4.4 / 5 - WC Safety review of the AMERISUN 4500W Open Frame Inverter Generator, 3800 Running Watts, Portable Gas Generator.
Written by Steven Eaton, WC Safety Editorial, from the published AMERISUN listing. The score above is the live Amazon customer rating captured at review time - not a WC Safety test result. We did not laboratory-test this product.
Written by Steven Eaton, WC Safety Editorial, from the published AMERISUN listing. The score above is the live Amazon customer rating captured at review time - not a WC Safety test result. We did not laboratory-test this product.
The AMERISUN 4500W Open Frame Inverter Generator, 3800 Running Watts, Portable Gas Generator is one of our picks for the CO-shutoff generator lineup. Everything below comes straight from the manufacturer's published listing - specs, capacities, and dimensions are theirs, not ours.
Every generator in this collection has one non-negotiable feature: a built-in carbon monoxide sensor that shuts the engine down when CO accumulates - the technology (CO Sensor, CO Shield, CO Watchdog and similar, named per listing) that the CPSC credits with preventing generator CO deaths. It does not make indoor use safe: generators run outdoors, 20+ feet from openings, exhaust pointed away, with working CO alarms in the building. See how to run a generator safely.
Key details, quoted from the manufacturer's published listing:
- RELIABLE 4500W POWER OUTPUT – Delivers 4500 peak watts and 3800 running watts to power refrigerators, freezers, sump pumps, power tools, RV appliances, and other essentials. Ideal for home backup, camping, tailgating, jobsites, and emergency power outages.
- BUILT-IN CO ALERT FOR ENHANCED SAFETY – Integrated carbon monoxide detection continuously monitors CO levels and automatically shuts down the generator when unsafe concentrations are detected, providing added protection for your family during indoor-adjacent outdoor operation and emergency use.
- PARALLEL READY FOR MORE POWER – Connect two compatible inverter generators with an optional parallel kit (sold separately) to increase available output for larger RV systems, multiple household appliances, construction equipment, or expanded backup power.
- ECO MODE FOR LONGER RUNTIME – Smart Eco Mode automatically adjusts engine speed based on power demand, reducing fuel consumption, minimizing engine wear, and extending runtime up to 6.5 hours at 50% load for efficient operation.
- RV READY & EASY TO TRANSPORT – Features a 120V 30A TT-30R RV outlet, household outlets, 12V DC output, and a VFT digital display showing voltage, frequency, and runtime. The lightweight 68 lb open-frame design makes it easy to carry for camping, RV travel, job sites, and emergency preparedness.
Compare all CO-shutoff generators, run power through rated heavy-gauge cords, and browse all jobsite equipment.
What to check before you buy
- Carbon monoxide is the headline hazard
- A portable generator produces CO in quantities that can be fatal indoors within minutes. It runs outdoors only, well away from doors, windows and vents - never in a garage, basement or crawlspace, even with the door open.
- Running versus starting watts
- Starting (surge) watts cover the momentary draw of motors; running watts cover continuous load. Sizing to the running figure alone leaves you short the moment a compressor or pump kicks in.
- Transfer switch for any building connection
- Connecting a generator to building wiring without a properly installed transfer switch can backfeed the utility line and endanger line workers. That connection is electrician territory.
- GFCI and cord condition
- Wet or outdoor use needs GFCI protection and outdoor-rated cords sized for the load and the run length.
How it compares to other portable generators we review
| Product | List price |
|---|---|
| AMERISUN 4500W Open Frame Inverter Generator, 3800 Running Watts, Portable Gas Generator (this page) | $256.19 |
| Westinghouse 6500 Watt Dual Fuel Home Backup Portable Generator, Transfer Switch Ready | $579.00 |
| Westinghouse 4650 Peak Watt Portable Generator, RV Ready 30A Outlet, Gas Powered, CO | $349.00 |
| Westinghouse 12500 Peak Watt Dual Fuel Home Backup Portable Generator, Remote Electric | $1049.00 |
| Westinghouse 12000 Peak Watt Dual Fuel Portable Inverter Generator, Remote Electric | $1899.00 |
| Westinghouse 2550 Peak Watt Super Quiet Portable Inverter Generator, RV Ready 30A, CO | $434.65 |
| WEN 4500-Watt Inverter Generator, RV-Ready, Quiet, Portable and Lightweight with Fuel | $559.48 |
List prices recorded when this page was last updated; Amazon pricing moves frequently, so check the live listing. Browse the full portable generators range, or see all jobsite equipment.
Frequently asked questions
How far from the house should a generator be placed?
Guidance from the CPSC is to run it outdoors and at least 20 feet from the building, with the exhaust directed away from doors, windows and vents. Distance alone does not help if exhaust can drift back inside.
Can I run a generator in the garage with the door open?
No. An open door does not clear CO from an attached structure, and this scenario appears repeatedly in fatal poisoning investigations. Outdoors and away from the building is the only safe placement.
What size generator do I need?
Add the running watts of everything that will run at once, then add the single largest starting surge on top. Motor-driven equipment such as compressors, pumps and refrigeration drives the surge figure.
Do I need a CO alarm if I own a generator?
A working CO alarm inside the building is a sensible backstop, and newer portable generators may include a CO shutoff feature. Neither replaces correct outdoor placement.
Can I plug a generator into a wall outlet?
No. Backfeeding through an outlet energizes the utility line and can kill line workers, as well as bypassing overcurrent protection. Use a transfer switch installed by a qualified electrician.
Where do the specifications on this page come from?
They are taken from the manufacturer's published listing. WC Safety does not laboratory-test products, and nothing is claimed here that the manufacturer does not state.
Does WC Safety sell this product?
No. WC Safety is an independent review site and an Amazon Associate. Purchases happen on Amazon, and we earn a commission on qualifying purchases at no extra cost to you.
How was the rating on this page determined?
The score shown is the live Amazon customer rating captured at the time of review. It reflects buyer feedback, not a WC Safety test result.
Brand / Vendor
AMERISUN
Model / SKU
—
Product Type
Generator
Price
$256.19 (Amazon)
Availability
Check current availability on Amazon
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