Best Generator Covers for Storage and Storm Readiness

Nobody discovers they need a generator cover on a sunny day. The discovery moment is 11 PM in the storm that took the grid down, when the machine that's supposed to save the freezer is sitting in horizontal rain and the manual says — correctly — don't run it wet. Water in outlets and controls trips GFCIs at best and creates shock hazards at worst. The garage is off the table forever (carbon monoxide kills generator owners every single storm season). The while-running cover exists precisely for this square: outdoor air, indoor weather.

Two Different Products, One Aisle

Storage covers are fitted fabric for the parked machine — dust, UV, and drizzle protection between outages. Fine, cheap, and not what this page is about. While-running covers are engineered canopies: vented for airflow and exhaust clearance, framed to hold shape in wind, with skirts that shed water away from outlets while leaving the hot side breathing. Buying the first kind and using it as the second kind melts fabric onto your muffler — check the label for "while running" before anything else.

The Picks

GenArmor Tent — The Storm Standard

Self-supporting frame, heavy waterproof canopy, open airflow on all sides, and installation that takes about two minutes in the driveway while the rain starts. Owner feedback is strong. Fits the broad middle of generator sizes including the Westinghouse 6500 class, stays put in real wind, and folds flat for storage between storms.

The Budget 32x24 — Same Idea, Pocket Money

For the price of two propane refills, the budget running cover does the essential job on mid-size frames: canopy over the controls and outlets, open sides for cooling and exhaust. Less wind-proof than the GenArmor and the fabric's a grade lighter — but for the once-or-twice-a-year outage in moderate weather, it's the honest value answer.

The Ultra Heavy-Duty Canopy — For the Big Frames

The 9,500-13,000W home-backup machines — the Westinghouse 12,500 and DuroMax class — outgrow standard covers. This one's sized and reinforced for big frames, with the heavier skirting sustained storms demand. If your generator is the size of a washing machine, this is its raincoat.

GenShed — The Permanent Address

For generators that live outside year-round, the shed approach combines storage protection with running ventilation: park it inside, open the vents and exhaust panel during outages, and skip the driveway wrestling entirely. It's the tidy solution for the staged-and-ready setup — generator connected to the transfer switch inlet, tank attached, one door swing from running.

The Picks at a Glance

Common Questions

Can a generator run in rain with one of these?

Do not assume so. CDC guidance says generators should be placed where rain and snow will not reach them and should not be operated wet. Use an operating shelter only when the generator manufacturer permits it, the shelter is explicitly compatible with that model, and every clearance and ventilation instruction is followed. A generic cover is not permission to operate electrical equipment in wet conditions.

Will the cover trap heat or exhaust?

A model-specific operating shelter should provide the clearances and ventilation required by both its instructions and the generator manual. Never run a generator under a storage cover, and stop operation if the shelter shifts, blocks exhaust, traps heat, or allows water onto the equipment.

How do I size one?

Measure your frame (length × width × height to the highest point, handles folded) and buy the cover that lists your dimensions with a couple inches to spare. "Universal" without dimensions is a returns-department word.

Do I still need a storage cover too?

The GenShed covers both jobs; canopy owners should add a cheap fitted storage cover for the eleven months of dust and UV between storms. Sun kills fuel lines and plastics slowly — the boring cover prevents the expensive repair.

Bottom Line

The GenArmor for the standard frames, the ultra heavy-duty for the big home-backup machines, the budget cover when the outage schedule is occasional, and the GenShed when the generator deserves a permanent address. It's the cheapest component of the whole backup-power stack — and the one standing between your four-figure machine and the storm it was bought for.