Best Generator Storage Enclosure

These three stand out in the product table above for different budgets and needs.

Best overall: the Westinghouse WGenTent Generator Running Cover for Open Frame Generators, around $149, is our first choice from the table.

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Best value: the Generator Covers, around $49, is the lowest priced of these three.

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Also great: the Champion Power Equipment 100603 Storm Shield Severe Weather Inverter, around $147, is another strong option with a different set of features.

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An enclosure meant to house a generator while it runs during a power outage needs substantial ventilation to prevent dangerous carbon monoxide buildup, far more than a simple storage box for an idle unit. Look for enclosures specifically rated for running generators, with vented panels positioned to allow real airflow rather than just decorative slots.

Never run a generator inside an enclosure not explicitly rated for that use, since inadequate ventilation with a running engine creates a genuine carbon monoxide hazard.

A generator is a common theft target, so a sturdy locking mechanism, ideally a hasp compatible with a quality padlock, adds real deterrence beyond a simple latch. Look for hinges and locking points reinforced against prying, since a weak lock point undermines the security benefit of the entire enclosure.

Choosing the best generator storage enclosure security features matters more in areas with higher theft risk or for generators stored somewhere not directly visible from the house.

Powder coated steel resists corrosion and impact damage better than plastic, holding up to years of outdoor exposure without cracking under UV or temperature swings. Heavy duty resin enclosures avoid rust entirely and work well in humid or coastal climates where metal corrosion is a bigger concern.

A weatherproof seal around access panels keeps rain and snow out during storage, protecting the generator's engine and electrical components from moisture damage over time.

Enclosures are typically sized around common generator wattage classes, so measuring your specific unit's dimensions, including any wheels or handle extensions, avoids buying a box too small to actually fit it. Leave some clearance space for cables and fuel lines if the enclosure needs to accommodate a running unit.

Oversized enclosures waste yard space, while undersized ones may not close properly around a generator with wheels or a raised frame.

Can a generator run safely inside an enclosure?

Only if the enclosure is specifically rated for running generators with adequate ventilation, since inadequate airflow around a running engine creates a serious carbon monoxide risk.

Do generator enclosures actually deter theft?

A sturdy locking enclosure adds a meaningful barrier and deterrent, though it should be combined with other security measures like a cable lock for units in higher risk areas.

What size enclosure fits a standard portable generator?

This varies significantly by generator wattage class, so measuring your specific unit's length, width, and height, including wheels and handles, against the enclosure's interior dimensions is the most reliable approach.

Is metal or resin better for a generator enclosure?

Metal offers stronger impact and security resistance, while resin avoids rust entirely and performs well in humid climates, so the better choice depends on your priorities and local weather conditions.

Does a generator enclosure need a permanent foundation?

Most enclosures sit on a level pad or gravel base rather than requiring a permanent foundation, though a stable, well drained surface helps prevent shifting or water pooling underneath over time.

Can an enclosure protect a generator during a storm while it runs?

A properly ventilated, weatherproof enclosure rated for running generators can provide reasonable protection during a storm, though the unit should still be positioned away from flooding risk areas.

A quality enclosure protects a generator from weather and theft while still allowing safe operation when it matters most during an outage. Prioritize genuine ventilation rating over aesthetics, size it to your specific unit, and your backup power stays ready when needed.