Having a generator get wet in the rain can cause all sorts of issues, from minor repairs to completely ruining the engine. Thankfully, there are several effective methods for keeping your generator dry even when it’s raining cats and dogs outside.
Use a Generator Enclosure or Shed
The best way to keep your generator dry is to store it in an enclosure or shed when not in use. Look for a weatherproof shed made of galvanized steel, heavy-duty resin, or wood. Make sure the enclosure is ventilated to prevent overheating but prevents rain, snow, and debris from getting inside. Place the enclosure on a concrete pad on level ground near your home or business for convenient access.
For extra protection, you can purchase a generator cover to place over the unit even when it’s inside the enclosure. Covers are made of durable, water-resistant materials like vinyl, nylon, or polyurethane coated polyester. Make sure you allow adequate ventilation space between the cover and the generator.
Here are some things to keep in mind when using an enclosure:
- Choose an enclosure that is larger than your generator so there is adequate ventilation space.
- Seal any gaps in the enclosure doors or walls to prevent moisture getting in.
- Make sure the generator’s exhaust is not aimed at any combustible materials on the interior walls.
- Consider installing lighting inside so you can easily see the controls at night.
- Keep a fire extinguisher nearby in case of electrical shorts or overheating accidents.
A proper generator enclosure will protect the unit from rain, snow, falling leaves and branches, dirt, etc. Just make sure to open the doors when running the generator so exhaust fumes vent properly.
Build a Generator Shelter
If you use your generator frequently or don’t have space for a large shed, consider building a simple shelter that sits directly over the generator. Use materials like:
- Metal roofing panels
- Treated lumber or galvanized pipe for the frame
- Clear poly sheeting for the sides (allows visibility and ventilation)
- Heavy duty tarps or reinforced plastic sheeting for the sides
Angle the roof so water runs off and make sure the shelter is anchored securely so it won’t blow over. The shelter should be just big enough to allow access and ventilation without exposing too much of the generator directly to rain and wind.
Use a Generator Cover
For portable generators, a good water-resistant cover can protect the unit from light or brief rain exposure. Look for coated materials like vinyl or specially treated polyester instead of regular canvas which can soak through. Make sure the cover fits snugly and allows adequate airflow around critical areas like the muffler and fuel cap.
Secure the cover well with straps so it won’t blow loose. Avoid using plastic sheeting which could trap moisture. Monitor the generator closely to make sure it doesn’t overheat under the cover when running.
Weatherproof the Control Panel
If your generator will be exposed to rain, you can weatherproof the control panel to prevent shorts and unsafe conditions. Use protective sprays or sealants made for electrical components:
- Electrical component spray – Apply to controls, terminals, and wires
- Silicone conformal coating – Seals out moisture for circuit boards
- Dielectric grease – Prevents corrosion on connectors
- Rubberized asphalt sealant – Apply around control panel covers and gaps
Avoid getting any sealant or grease on rotating parts like cooling fans or on the generator brushes. Check that controls still operate smoothly after applying weatherproofing materials.
Keep It High and Dry
Look for the highest, driest spot possible to park your generator when in use or storage. Some things to consider:
- Pour a concrete pad to elevate the generator above wet ground.
- Place blocks or timbers under the frame to raise it up.
- Locate under roof overhangs or next to walls/fences for shelter.
- Angle away from prevailing winds so exhaust blows rain away.
- Keep out of low-lying areas or depressions where water collects.
Try to keep the generator at least 3 feet above the ground and protected from wind on all sides for the best rain protection. Avoid placing directly on wet soil or grass.
Use a Fuel Stabilizer
Accumulation of moisture in the generator fuel tank can cause issues with engine startup and performance. Avoid this by:
- Keeping the tank full to reduce condensation buildup
- Adding fuel stabilizer that contains antioxidants and water dispersants
- Using fuel treatments to absorb moisture
- Draining old gas and adding new before storing for long periods
Products like Sta-Bil fuel stabilizer prevent moisture-related issues by suspending water molecules so they don’t settle out of the fuel into droplets. Follow manufacturer’s mixing instructions carefully.
Here is a quick guide to fuel stabilizers for generators:
| Brand | Mix Ratio | Treatment Time |
|---|---|---|
| Sta-Bil | 1 oz per 5 gallons | Treats fuel for 1 year |
| PRI-G | 10 oz per 10 gallons | Treats fuel for 2 years |
| Sea Foam | 1 oz per gallon | Treats fuel for 1 year |
Inspect Seals and Gaskets
Make sure all seals, gaskets, and o-rings on the generator are in good shape to prevent leaks. Check:
- Fuel tank caps and fuel lines
- Engine crankcase seals
- Gaskets around cylinder heads or valve covers
- Shaft seals around crankshafts and flywheels
- Door seals and panel fasteners
- Rubber exhaust manifold seals
Look for cracked, dry, or warped seals. Replace any that appear worn or damaged and lubricate with sealant if needed. This prevents leaks that could expose the inner generator to moisture.
Check the Voltage Regulator
Issues with the generator’s voltage regulator can allow moisture to penetrate the rotor and stator windings. Look for:
- Corroded or burnt pins on the voltage regulator
- Damage to wires and insulation
- Cracked or broken regulator housing
Replace damaged regulators immediately to prevent windings from shorting out. Keep regulators protected in a waterproof control box.
Keep It Clean
Don’t allow dirt, leaves, lawn clippings or other debris to accumulate on the generator. These can retain moisture and accelerate corrosion:
- Wipe down the exterior after use.
- Hose out the interior compartment occasionally.
- Clean dirt from fuel lines, radiators, and panels.
- Remove stored items that can trap moisture underneath.
A clean, dry generator will have fewer issues than one left dirty and wet between uses. Inspect all wiring and components periodically for any moisture buildup or corrosion as well.
Test and Exercise It Regularly
Start up and run your generator at least monthly to “exercise” the engine and electrical components. This prevents moisture accumulation and ensures everything continues functioning properly when you need it.
Let the unit run for 30-60 minutes under at least half the rated load. Check for leaks, unusual noises, surges, or other problems each time. Test all protective devices like circuit breakers as well.
Exercise helps blow out moisture, re-lubricates seals, charges the battery, and prevents corrosion buildup over long storage periods. If issues are identified early, they can be addressed before causing significant damage.
Conclusion
Protecting your generator from wet weather is key to ensuring reliable performance when you need backup power. While no method is completely foolproof, combinations of proper storage, weatherproofing, maintenance, and operation will keep your generator running optimally even in damp conditions.
Some time and money invested up front saves much bigger repair bills and headaches down the road. Whenever operating in rain, take extra precautions and be prepared to move the unit quickly if needed. A dry generator runs happier and lasts longer!