Best Generator Covers for Outdoor Use: Protecting Your Unit Safely

A generator cover protects a stored or idle generator from rain, snow, sun and dust, but it must never be used while the generator is running. The best outdoor cover fits your specific unit, uses weather-resistant fabric, allows airflow to prevent condensation, and has a secure tie-down. Measure your generator carefully before buying.

Cover Versus Running Enclosure: A Safety Distinction

Standard covers are made for protecting a unit when it is off and cool. Running a generator under a fabric cover can trap exhaust and heat, creating a fire and carbon monoxide hazard. Generators should be operated outdoors, well away from windows, doors and vents, following the manufacturer’s manual and local codes. Some products are sold as running covers or tents; if you consider one, check that it is specifically designed for operation and follow the instructions exactly. Always allow the engine and exhaust to cool completely before covering, and install working carbon monoxide alarms in your home.

Materials and Weather Resistance

Common cover materials include polyester with a waterproof coating, vinyl, and heavier canvas-style fabrics. Look for UV-resistant treatment, since sunlight can degrade cheap fabric quickly. Seams that are welded or taped keep out moisture better than ordinary stitching. A cover that fits snugly but not tightly reduces flapping in wind, and elastic hems or straps help it stay on during storms.

• Vents: breathable vent panels reduce condensation and mildew inside the cover.
• Tie-downs: buckles or drawcords stop wind from lifting the cover.
• Lining: a soft lining protects the paint and fuel cap.
• Handles and access: some covers have openings for access without removing the whole cover.

Types of Covers Compared

Measuring Your Generator

Measure the length, width and height, including the handle, wheels and any fuel gauge, with the unit as you store it. Compare these numbers with the cover’s dimensions, allowing a little extra for easy on-off. A cover too small strains seams and exposes parts, while one too large catches wind. If you store the generator on a cart or frame, include these in your measurements. Write down your model number and look for covers that list compatibility.

When you’re ready to compare products, a search for waterproof universal generator covers will show many dimensions and materials. Check feedback about fit with your size class.

Storage and Maintenance Tips

A cover is only one part of storage. Place the generator on a flat, dry surface, ideally raised off the ground on pavers or a pad to avoid standing water. Follow the manufacturer’s advice on fuel: many recommend using fuel stabilizer or draining the carburetor for long-term storage, and running the unit periodically to keep it in good order. Keep the cover clean, remove leaves and snow, and let it dry before reinstalling if it gets soaked.

For additional protection against moisture, add a desiccant pack inside the cover or a small fuel stabilizer for small engines to the tank before storage. Look at your owner’s manual for approved products. A lockable chain or cable is another sensible accessory, because portable generators are attractive to thieves. Browse generator security cables and locks for anchoring the unit to a fixed object.

Storm Season Readiness

Because outages tend to occur during bad weather, prepare in advance. Keep the cover easy to remove and the generator accessible so you can set it up quickly, in a safe outdoor location with distance from the house. Store fuel in approved containers away from living areas, and test the unit before the season starts. If you live in a region with strong winds, consider extra tie-downs or a hard storage box. Always remove the cover completely before starting the generator.

Cost and longevity are worth a quick comparison. Inexpensive covers often fail first at the seams and the coating, especially after a season of sun and freeze-thaw cycles, while better covers use thicker fabric and reinforced corners. Read feedback for comments about fading, cracking and whether the fit matches the listed dimensions. Having a spare cover is not necessary, but replacing the cover every couple of seasons costs far less than repairing a rusted or water-damaged generator. Also consider whether you need access to the fuel cap, oil check point or control panel; some covers have zippered openings that save you from lifting the whole cover, which is handy when you top off fuel during an extended outage.

Finally, never place a cover over a generator that was recently running, since residual heat can melt fabric and ignite fumes near the exhaust. Wait until every surface is cool to the touch, and make a habit of checking the unit for fuel leaks before covering it for the season.

Frequently Asked Questions

Can I leave a cover on while the generator runs?

No, not a standard cover. Operate a generator in open air with clearance as specified in the manual, and only use accessories made for operation.

Will a cover stop rust?

It helps, but breathability and dry storage matter too. A non-breathable cover can trap moisture and make corrosion worse.

Do I need a model-specific cover?

Not always, but a tailored fit generally stays on better in wind. Universal covers work if the measurements are right.