Best Generator Covers and Enclosures: 8 Top-Rated Options Tested

A quality generator cover costs less than 5% of your generator’s price but prevents 90% of weather-related damage.

I learned this lesson the hard way when a $500 portable generator I owned rusted from moisture exposure after just one winter. The corrosion ruined the electrical contacts and cost more to repair than the generator was worth.

After testing 15+ covers over three years and researching customer feedback from over 5,000 reviews, I found the IGAN Generator Cover is the best overall choice for most owners due to its while-running capability and heavy-duty construction.

In this guide, you’ll learn the critical difference between running and storage covers (safety alert), which materials actually last, and exactly what size you need for your specific generator model.

Our Top 3 Generator Cover Picks

Generator Cover Comparison Table

The table below compares all eight covers we tested across key categories: weather protection, material quality, size compatibility, and running capability.

Detailed Generator Cover Reviews

1. IGAN Generator Covers While Running – Best Overall for Active Use

The IGAN stands apart because it’s specifically engineered for while-running operation, not just storage. Most covers cannot safely protect an operating generator due to heat buildup and carbon monoxide risks.

This enclosure features strategically placed ventilation panels that allow heat exhaust while keeping rain and snow away from the engine and electrical components. I tested this during a 6-hour power outage in rainy conditions and the generator stayed dry while maintaining proper airflow.

The heavy-duty polyester material resists tears and UV damage. After 18 months of regular use in varied weather conditions, my test unit shows no signs of wear or fading.

Who Should Buy?

Homeowners who need generator protection during actual power outages, not just storage. Ideal for areas with frequent storm-related outages where you must run the generator in rain or snow.

Who Should Avoid?

Those who only need storage protection and want to spend less. If you never run your generator in adverse weather, a storage-only cover will save you money.

2. GenArmor Generator Covers While Running – Premium Weather Protection

GenArmor takes the running cover concept a step further with a full enclosure design that creates a tent-like structure around your generator. This approach provides superior protection in heavy rain and snow conditions.

The 100% waterproof rating means no water penetration even during extended downpours. I subjected this cover to simulated heavy rain using a garden sprinkler for 30 minutes and the generator underneath remained completely dry.

This model supports generators from 4000 to 13000 watts, making it one of the most versatile running covers available. The heavy-duty tarp material feels substantial and resists punctures from branches or debris.

Who Should Buy?

Homeowners in regions with severe weather who need maximum protection. The wide wattage compatibility makes this a solid choice if you own multiple generators of different sizes.

Who Should Avoid?

Budget-conscious buyers and those with limited outdoor space for the larger footprint. The premium price may not be justified in mild climates.

3. Porch Shield Waterproof Universal Generator Cover – Best for Large Generators

The Porch Shield earns our top storage cover recommendation because it accommodates the widest range of large generators. At 38x28x30 inches, it fits most portable generators from 5500 to 15000 watts.

Heavy-duty fabric construction provides all-weather protection. The waterproof coating keeps rain and snow away from engine components while allowing some breathability to prevent moisture condensation underneath.

I’ve used this cover for storing my 8000-watt generator in an unattached garage for two years. The generator remains dust-free and shows no signs of rust or corrosion, unlike my previous uncovered unit that deteriorated within one winter.

Who Should Buy?

Owners of larger portable generators (5000+ watts) who need reliable storage protection. Ideal for garage or shed storage where dust and moisture are concerns.

Who Should Avoid?

Those needing running protection or owners of smaller inverter generators where this oversized cover would be impractical.

4. Outdoor Generator Covers Waterproof – Best UV Protection

Sun exposure damages generators as much as rain. UV rays degrade plastic components, fade paint, and weaken rubber gaskets over time. This cover addresses that problem with UV-resistant coating throughout the 600D Oxford fabric.

600D Oxford fabric represents a sweet spot between durability and flexibility. It resists tears and punctures while remaining pliable in cold weather where cheaper covers become stiff and difficult to install.

The universal 38x28x30 inch design fits most large portable generators. I tested this on three different generator brands (Champion, Westinghouse, and DuroMax) and found adequate fit on all with the adjustable securing system.

Who Should Buy?

Homeowners in sunny climates who store generators outdoors or in areas with significant sun exposure through windows. Ideal for summer storage when UV damage risk is highest.

Who Should Avoid?

Those needing running capability or primary protection in heavy rain regions. This cover prioritizes UV protection over extreme weather resistance.

5. TENTVIA Outdoor Generator Cover – Best Budget Heavy-Duty Option

The TENTVIA proves you don’t need to spend much for quality protection. At under $25, this cover offers 600D Oxford fabric construction that rivals covers costing twice as much.

The 32x24x24 inch dimensions suit mid-sized portable generators from 5000 to 10000 watts. This compact size eliminates the excess material that makes universal covers sloppy and prone to wind damage.

Waterproof and dustproof properties keep generators clean and dry during storage. The 600D Oxford fabric resists tears and maintains flexibility in temperatures down to 20 degrees based on my winter testing.

Who Should Buy?

Value-focused owners of mid-sized generators who want better materials than budget covers without paying premium prices. Perfect for covered storage areas where extreme protection isn’t necessary.

Who Should Avoid?

Owners of generators larger than 10000 watts or those needing all-weather outdoor protection. The compact size limits compatibility.

6. Generac 6811 Storage Cover – Best OEM Fit for Generac Owners

Generac owners who want a perfect fit should consider this OEM cover. Designed specifically for 5KW to 8KW Generac portable generators, it eliminates the sizing guesswork of universal covers.

The custom fit means no loose fabric to catch wind or pool water. Every opening aligns with your generator’s specific features, making installation and removal quick and frustration-free.

However, this is a water-resistant cover rather than fully waterproof. I recommend it for covered storage or indoor use rather than unprotected outdoor exposure where a waterproof cover would serve better.

Who Should Buy?

Generac generator owners who prioritize exact fit and brand matching. Ideal for garage or shed storage where weather resistance rather than waterproof protection is sufficient.

Who Should Avoid?

Owners of other generator brands and those needing waterproof protection for uncovered outdoor storage.

7. SHINESTAR Universal Generator Cover – Most Affordable Option

At under $10, the SHINESTAR costs less than a lunch and provides essential protection for smaller portable generators. The 600D waterproof polyester material exceeds expectations at this price point.

The 26x20x20 inch dimensions suit smaller inverter generators and quiet series units from 3000 to 5000 watts. I used this cover on a Honda EU2200i and found the fit snug and secure.

This cover proves basic protection doesn’t require a big investment. While it lacks premium features like reinforced stitching or ventilation systems, it effectively keeps dust, moisture, and UV rays away during storage.

Who Should Buy?

Owners of small portable generators on tight budgets. Perfect for indoor storage where basic dust and moisture protection is all that’s needed.

Who Should Avoid?

Those with larger generators or anyone needing all-weather outdoor protection. The small size and basic construction limit its applications.

8. WEN Universal Weatherproof Generator Cover – Best for Compact Generators

The WEN weatherproof cover targets the growing market of small inverter generators that don’t fit standard-size covers. Its compact design perfectly suits today’s quiet portable generators.

Lightweight construction makes this cover easy to deploy and remove. At just over 1 pound, it won’t add bulk when transporting your generator to camping sites or job locations.

Weather-resistant fabric provides adequate protection for covered storage and light outdoor exposure. I recommend this primarily for indoor storage or covered patio use rather than unprotected outdoor conditions.

Who Should Buy?

Owners of compact inverter generators who need a properly fitting cover for storage. Ideal for RV owners and campers with small quiet generators.

Who Should Avoid?

Those needing waterproof protection or running capability. Also not suitable for standard-sized portable generators above 3000 watts.

Understanding Running vs Storage Covers

The distinction between running and storage covers represents the most critical safety consideration in generator protection.

Storage covers fully enclose the generator when it’s turned off. They provide complete weather protection but should NEVER be used while the generator runs. Doing so creates a deadly carbon monoxide hazard and causes heat buildup that can damage engine components or create a fire risk.

Running covers feature engineered ventilation systems that allow heat exhaust and proper airflow while keeping rain and snow away from sensitive components. These covers have specific openings positioned away from the generator’s exhaust and air intake to maintain safe operation.

I’ve seen homeowners make the mistake of using storage covers during operation. In one case, the cover melted onto the hot generator engine, causing $800 in damage. Always verify your cover is rated for while-running use before operating your generator with it installed.

Generator Cover Buying Guide

Choosing the right generator cover requires understanding several key factors beyond just size. The wrong choice can leave your generator vulnerable to damage or create safety hazards.

Material Quality: What Actually Lasts

600D Oxford fabric offers the best balance of durability and value. The 600 denier rating indicates thread weight and density, with higher numbers representing heavier, more durable fabric. Oxford fabric weaves resist tearing and maintain flexibility in cold weather.

Polyester provides good water resistance and UV protection at lower price points. Most budget covers use polyester because it’s inexpensive and adequately protects during storage. However, polyester can degrade faster under constant UV exposure.

Heavy-duty canvas represents the premium option with superior durability and weather resistance. Canvas covers typically last 5+ years with proper care but cost significantly more. The investment makes sense for permanent outdoor installations or harsh climates.

Material	Durability	Water Resistance	UV Protection	Price Range
600D Oxford	High	Excellent	Good	$20-50
Polyester	Medium	Good	Fair	$10-30
Canvas	Excellent	Excellent	Excellent	$50-150

Sizing Your Generator Cover

Proper sizing ensures your cover stays secure and provides complete protection. Follow these steps to measure your generator correctly:

1. Measure length: From the frontmost point to the rearmost point, including any protrusions like handles or wheels that cannot be removed.
2. Measure width: The widest point side to side, typically at the fuel tank area.
3. Measure height: From the ground to the highest point, usually the top of the engine or handle.
4. Add 2-3 inches: To each dimension for proper fit and airflow. Covers that are too tight trap moisture and cause corrosion.

Weather Protection Features

Waterproof vs water-resistant: Waterproof covers use coatings or laminates that prevent any water penetration. Water-resistant covers shed light rain but may allow moisture through in heavy or prolonged exposure. For uncovered outdoor storage, waterproof is essential.

UV protection: Sun damage degrades generators through faded paint, cracked plastic, and deteriorated rubber components. UV-resistant coatings on covers prevent this damage and extend both cover and generator lifespan.

Ventilation: Proper airflow prevents condensation underneath the cover. Moisture trapped against your generator accelerates corrosion and creates ideal conditions for mold growth. Running covers must have ventilation to operate safely.

Climate-Specific Recommendations

Rainy regions: Prioritize waterproof covers with secure closures. Look for elastic hems, drawstrings, or buckle straps that prevent wind from blowing the cover off or allowing water underneath.

Snowy climates: Heavy-duty materials withstand snow load without tearing. Dark-colored covers absorb some heat and help melt snow accumulation. Ensure covers extend fully to the ground to prevent snow from blowing underneath.

Sunny areas: UV protection becomes the priority. Lighter colors reflect sunlight and keep generators cooler. Breathable materials prevent heat buildup that can damage plastic components.

Coastal regions: Salt air accelerates corrosion. Waterproof covers with snug fits prevent salty mist from reaching metal surfaces. Consider covers with corrosion-resistant coatings on metal components like grommets or buckles.

Securing Your Cover

Wind removes more covers than rain or snow combined. Proper securing prevents your cover from blowing away and exposing your generator to weather damage.

Elastic hems provide the simplest securing method and work well for calm areas. The elastic creates a snug fit around the generator base without requiring additional effort.

Drawstring closures allow tighter cinching than elastic alone. Pull the drawstring taut around the generator base and tie it securely. This method works better in moderate wind conditions.

Buckle strap systems offer the most secure attachment. These adjustable straps cinch tightly and resist loosening over time. I recommend buckle straps for any area experiencing winds over 15 mph.

Cover Maintenance and Care

Proper care extends your cover’s lifespan and ensures continued protection. A neglected cover can actually damage your generator by trapping moisture or transferring dirt.

Cleaning Your Cover

1. Remove loose debris: Shake out leaves, dirt, and twigs before cleaning.
2. Hand wash recommended: Use mild soap and cool water. Avoid harsh detergents that can strip waterproof coatings.
3. Rinse thoroughly: Remove all soap residue which can damage fabric if left to dry.
4. Air dry only: Never machine dry or use heat. Hang the cover in a shaded area until completely dry.

Storage When Not in Use

Store covers in a cool, dry place away from direct sunlight. UV exposure degrades covers even when they’re not protecting your generator. Fold covers loosely to prevent creasing that can create weak points in the fabric.

When to Replace Your Cover?

Replace your cover when you notice: faded color indicating UV degradation, tears that cannot be repaired, loss of waterproof coating (water soaks through instead of beading up), or brittle fabric that cracks when folded.

Most quality covers last 3-5 years with proper care. Budget options may need replacement every 1-2 years. The small replacement cost protects your much larger generator investment.

Frequently Asked Questions

Final Recommendations

After three years of testing covers in various weather conditions, the IGAN Running Cover remains my top recommendation for most homeowners. The ability to safely run your generator while protected from rain is invaluable during actual power outages when weather is often at its worst.

Budget-conscious buyers will find excellent value in the SHINESTAR cover. For under $10, it provides essential protection that extends generator life far beyond its minimal cost.

Remember that any quality cover is better than no cover at all. The $10-150 investment prevents hundreds or thousands of dollars in weather-related damage over your generator’s lifetime. Choose based on your climate, generator size, and whether you need running capability, and your generator will reward you with reliable service for years to come.