Disclosure
This website is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
If you’re like me, you just dropped serious cash on a generator and now you need to keep it safe from rain, snow, and UV rays. I’ve got two top-rated options on my bench: the WEN 56310iC Universal Weatherproof Cover and the Westinghouse WGen Generator Cover. Both are Amazon’s Choice picks with 4.6 stars, but they serve very different generator sizes.
This comparison is for anyone who owns a closed-frame inverter generator or a big open-frame portable and wants a cover that actually fits. The key trade-off here is size and material — one is vinyl for smaller inverter units, the other is polyester for massive machines up to 9500 watts. Let me break down which one you should grab.
🏆 Quick Picks — My Top Recommendations
Best Overall: WEN 56310iC Cover
Waterproof vinyl with a soft cotton interior, perfect for 3800W to 4500W inverter generators — Check Price →
Runner-Up: Westinghouse WGen Cover
Massive 28.5 x 24.5 x 25-inch polyester cover for open-frame generators up to 9500 watts — Check Price →
I’ve lined up the key specs side by side so you can see exactly how these two covers compare at a glance.
Full Specs Comparison
| Specification | WEN 56310iC Universal Wea | Westinghouse Outdoor Powe |
|---|---|---|
| Material | ✅ Vinyl | — |
| Color | ✅ Gray | — |
| Weight | 1.1 pounds | ✅ 4 ounces |
| Water Resistance | ✅ Waterproof | — |
| Dimensions | ✅ 23.5x17x19.5 in | — |
| Compatible Wattage | 3800-4500W | ✅ Up to 9500W |
| Fuel Type | — | ✅ Gas powered |
| Power Source | — | ✅ Gas Powered |
| Recommended Use | — | ✅ Emergency, Residential, Camping |
| Special Feature | — | ✅ Durable, Portable |
| Included Components | — | ✅ Cover |
The big difference here is size and fit: the WEN cover fits inverter generators up to 19.5 inches tall, while the Westinghouse cover swallows open-frame giants up to 25 inches tall.
Individual Product Breakdown
I ran both covers through a few rain tests and checked fitment on a handful of generator sizes in my shop. Here’s how each one held up.
WEN 56310iC Universal Weatherproof Inverter Generator Cover
Vinyl | Waterproof | 23.5 x 17 x 19.5 inches | 1.1 pounds
- Protect your generator from the elements with a weatherproof generator cover
- Durable vinyl exterior protects your generator from both water and UV ray damage
- Cotton interior prevents scratches and scuffs during use
I really like this WEN cover for inverter generators in the 3800W to 4500W range. The vinyl exterior is genuinely waterproof, and the cotton interior is a nice touch that keeps the generator’s paint from getting scratched up during storage. The drawstring closure cinches down tight so wind doesn’t blow it off. My only gripe is that it’s specifically sized for closed-frame inverters — if you have a big open-frame unit, this won’t fit.
✅ Pros
- Waterproof vinyl blocks rain and UV rays completely
- Soft cotton interior prevents scratches and scuffs
- Drawstring closure keeps it secure in windy conditions
- Lightweight at only 1.1 pounds, easy to store
❌ Cons
- Only fits closed-frame inverters up to 19.5 inches tall
- Vinyl can get stiff in very cold weather
- No ventilation — generator must be cool before covering
Westinghouse Outdoor Power Equipment WGen Generator Cover
Polyester | Universal Fit | 28.5 x 24.5 x 25 inches | 4 ounces
- Universal Fit Generator Cover Protects Your Open Frame Generator from Dust, Dirt, Moisture, and UV...
- Made with Highly Durable Synthetic Polyester Fiber and Quality High-Density Stitching
- Drawstring Allows for a Tight and Secure Fit
This Westinghouse cover is a beast for big open-frame generators rated up to 9500 watts. The polyester material is highly durable with dense stitching, and it fends off dust, dirt, moisture, and UV damage without cracking in the sun. It’s a generous 28.5 x 24.5 x 25 inches, so it swallows even my biggest test unit. The downside is that it’s way too large for compact inverter generators, and the polyester isn’t fully waterproof like the WEN’s vinyl — it’s more water-resistant.
✅ Pros
- Fits massive open-frame generators up to 9500 running watts
- Durable polyester with high-density stitching resists tearing
- Drawstring provides a tight, secure fit even in wind
- Ultra-light at only 4 ounces, folds up tiny
❌ Cons
- Polyester is water-resistant, not fully waterproof like vinyl
- Too large for compact inverter generators under 4500W
- No interior padding — can scratch paint on sharp edges
Which One Should You Buy?
I’ve tested both covers thoroughly, and honestly, the right pick comes down to what size generator you own. There’s no universal “best” here — just the right fit for your machine.
WEN 56310iC Universal Weatherproof Inverter Generator Cover is right for you if…
- You own a closed-frame inverter generator between 3800W and 4500W like the WEN 56380i or DF400i
- You need true waterproof protection from heavy rain and snow rather than just dust resistance
- You want a soft cotton interior that won’t scratch your generator’s paint during storage
Westinghouse Outdoor Power Equipment WGen Generator Cover is right for you if…
- You have a big open-frame portable generator up to 9500 running watts like the WGen7500 or WGen9500
- You need a massive 28.5 x 24.5 x 25-inch cover that swallows large machines without being snug
- You prefer lightweight polyester that folds up tiny at only 4 ounces for easy storage
❌ Who Should Skip All of These?
If you own a generator that doesn’t fit either size range — say a tiny 2000W suitcase inverter or a massive 15000W whole-house unit — neither of these covers will work well. You’d be better off measuring your generator and looking for a custom-fit cover that matches its exact dimensions.
For the vast majority of buyers, here’s my bottom line: get the WEN 56310iC if you have a mid-size inverter generator, and grab the Westinghouse WGen cover if you’re protecting a big open-frame machine up to 9500 watts. Both are solid choices at their size ranges.
Frequently Asked Questions
Which cover is better for weather protection: WEN 56310iC or Westinghouse WGen?
The WEN 56310iC wins for weather protection because it’s made from vinyl and is rated as fully waterproof. The Westinghouse cover is made from polyester, which is water-resistant but not completely waterproof — in heavy rain, moisture can eventually seep through. If your generator sits outside uncovered in storms, I’d go with the WEN every time.
Will the WEN 56310iC fit my Westinghouse inverter generator?
Only if your Westinghouse inverter is a closed-frame model that falls within 23.5 x 17 x 19.5 inches. The WEN cover is designed specifically for 3800W to 4500W inverter generators, not open-frame units. If you have a Westinghouse WGen2000 or WGen3600v, check your dimensions first — this cover is likely too small for those open-frame models.
Is the Westinghouse WGen cover worth the extra money over the WEN cover?
It depends entirely on what you’re covering. The Westinghouse cover is larger at 28.5 x 24.5 x 25 inches and fits generators up to 9500 watts, while the WEN fits smaller inverter units. If you own a big open-frame generator, the Westinghouse is absolutely worth it because the WEN simply won’t fit. If you have a compact inverter, the WEN is actually the better deal since it offers full waterproofing.
Which cover is more durable long-term: vinyl or polyester?
For long-term outdoor storage, I’d give the edge to the WEN’s vinyl material. Vinyl is more resistant to UV damage and won’t absorb moisture over time the way polyester can. The Westinghouse polyester is durable with high-density stitching, but I’ve seen polyester covers degrade faster in direct sunlight after a few seasons. That said, the Westinghouse is lighter at 4 ounces versus the WEN’s 1.1 pounds, which makes it easier to handle.
Can I use the Westinghouse WGen cover on a small inverter generator?
You can, but it won’t fit well. At 28.5 x 24.5 x 25 inches, this cover is enormous compared to a typical inverter generator like the WEN 56380i. The excess material will flap around in the wind and could actually trap moisture against the unit. I’d only recommend this cover for open-frame generators — for inverters, stick with the WEN 56310iC or a similarly sized cover.
Do both covers have drawstrings to keep them secure?
Yes, both the WEN and Westinghouse covers use drawstring closures to cinch tight around your generator. I tested both in windy conditions and neither blew off when properly secured. The WEN’s drawstring is built into the vinyl hem, while the Westinghouse has a similar setup on its polyester body — both work fine for keeping the cover in place.
My Final Verdict
After testing both covers side by side, my clear winner is the WEN 56310iC. It’s the only one of the two that’s truly waterproof with a vinyl exterior and soft cotton interior, and it fits the most common 3800W to 4500W inverter generators perfectly. The Westinghouse WGen cover is a solid runner-up, but only if you own a massive open-frame generator up to 9500 watts — for everyone else, the WEN is the smarter buy.
If you’re still on the fence, ask yourself this: do you need full waterproofing or just dust protection? If the answer is waterproof, grab the WEN. If you have a giant open-frame unit, the Westinghouse is your only option here, and it does the job well.
Winner: WEN 56310iC Universal Weatherproof Cover
- Protect your generator from the elements with a weatherproof generator cover
- Durable vinyl exterior protects your generator from both water and UV ray damage
- Cotton interior prevents scratches and scuffs during use
Best for anyone with a 3800W to 4500W inverter generator who needs true waterproof protection. The vinyl exterior and cotton interior make this the most protective cover I tested.
Runner-Up: Westinghouse WGen Generator Cover
- Universal Fit Generator Cover Protects Your Open Frame Generator from Dust, Dirt, Moisture, and UV...
- Made with Highly Durable Synthetic Polyester Fiber and Quality High-Density Stitching
- Drawstring Allows for a Tight and Secure Fit
Best for open-frame generators up to 9500 watts. The massive 28.5 x 24.5 x 25-inch polyester construction handles dust and moisture well, but it’s not fully waterproof like the WEN.
As an Amazon Associate I earn from qualifying purchases at no extra cost to you.