Generator Summer Storage: Keep It Ready

Why summer storage matters

If you bought a generator for storm season or camping, the hot months are often the quiet ones. The unit sits in a shed, a garage, or the back of a truck bed until a hurricane watch or a camping trip brings it out again. How you store it during that downtime decides whether it starts when you need it.

Summer storage is not the same as winterizing. The temperatures are different, the use pattern is different, and the fuel and battery questions are different. This article walks through what the listing and the owner's manual actually tell you, and what you should ask the maker before you put the unit away. For a refresher on the basics, see the best generator guide.

What the listing tells you about storage

A generator listing rarely says "store it this way." What it does give you are the terms that matter for storage: the fuel type, the starter type, and the presence of a battery. Read those words carefully.

Fuel type: a listing that says "gasoline," "dual fuel," or "tri fuel" tells you what the engine burns. Storage advice in the manual will be written for that fuel. A dual fuel or tri fuel unit may have different guidance for propane and natural gas than for gasoline. Compare fuel types in the fuel types comparison.

Starter type: "electric start" means there is a starter battery. "Recoil start" means there is not. The battery is a storage concern because it can lose charge over weeks of sitting. The manual will describe how to keep it ready. See electric start vs recoil for more.

Features like a fuel gauge or an hour meter are also storage-relevant. The hour meter can tell you when the manual's maintenance schedule calls for service, and the fuel gauge helps you see what is left in the tank before you store it. Learn about the hour meter.

Fuel considerations for hot months

The owner's manual is the only source for fuel storage advice. It may describe draining the fuel system or adding a stabilizer before storage. Follow that text exactly. Do not guess, and do not take advice from a forum.

Gasoline is a petroleum product, as the EIA explains. It can degrade over time, which is why the manual may tell you to treat it or drain it. Propane and natural gas are hydrocarbon gas liquids, per the EIA, and they store differently. A tri fuel or dual fuel unit may have separate instructions for each fuel. For more on fuel choices, see dual fuel vs tri fuel.

Never store a generator with fuel inside a living space. The manual and the CPSC both point to outdoor use and storage. The CPSC says never use a generator indoors or in a garage, even with doors and windows open. That applies to running it, and common sense says the same for storing it with fuel.

If the manual says to drain the fuel, do it outdoors, away from any ignition source. If it says to add a stabilizer, use the type and amount the manual names. The listing will not tell you this; the manual will. Read about fuel stabilizer additives for background.

Battery care while stored

An electric start generator has a 12-volt battery that can discharge over weeks of sitting. The manual will describe how to keep it charged: a battery maintainer, a trickle charger, or periodic starts. Follow that guidance.

The listing may mention a "battery charger" or a "battery tender" as an included item or a separate purchase. If the manual says to connect a maintainer, that is the tool to use. If it says to disconnect the battery, do that. See battery charging maintenance for more.

Heat is hard on batteries. Store the generator in a cool, dry place if the manual allows it, but never run it indoors. The CPSC's guidance is clear: generators produce carbon monoxide, which is deadly, and must be used outside only.

If the battery is removable, the manual may tell you to store it separately. Keep it off the ground and away from metal objects. Charge it according to the manual's schedule, not a guess.

Ventilation and where to store it

Ventilation is a safety issue, not a comfort issue. A generator engine produces carbon monoxide, an odorless, colorless gas that can kill. The CPSC says never use a generator inside a home, garage, basement, crawlspace, or shed, even with doors and windows open. That rule does not change in summer.

For storage, the unit should be in a dry, covered location, but that location must be outdoors or in a space that is not attached to living areas. A detached shed with the door open for air movement is a common choice, but check the manual for any specific storage temperature range.

Never store a generator near a window, door, or vent that leads into the house. The CPSC's guidance about running the unit far from openings applies to storage too, because fuel vapors and exhaust can seep in.

If you use a cover, make sure it is the type the listing or the maker recommends. A cover that traps moisture can cause rust. The manual may describe how to prepare the unit for a cover, such as letting it cool completely first. See weatherproof covers for options.

Before you store it: a checklist

Read the owner's manual's storage section. It is the only authority.

Run the generator outdoors, far from windows, doors, and vents, to burn off any fuel left in the carburetor, if the manual suggests it.

Let the engine cool completely before covering or moving it.

Check the fuel level and decide, per the manual, whether to drain or treat it.

Disconnect or maintain the battery as the manual directs.

Clean the exterior with a dry cloth to remove dust and debris.

Store in a dry, covered, outdoor location, away from living areas.

Keep the manual and any receipts with the unit.

When you bring it out again

Before the first use of the season, the manual will list checks: oil level, fuel freshness, battery charge, and a visual inspection for pests or damage. Do those checks outdoors.

If the battery was disconnected, reconnect it per the manual. If fuel was drained, refill it outdoors. If a stabilizer was used, the manual may say to run the unit briefly to circulate the treated fuel.

The CPSC and CDC both stress that a generator must be run outside only, more than 20 feet from windows, doors, and vents. That is not a storage tip; it is a life-saving rule. Read the CPSC and CDC pages linked below for the full guidance.

What to pick for your situation

Questions

Can I store my generator in the garage during summer?

The CPSC says never run a generator inside a garage, even with the door open. For storage, the manual is the guide, but a detached, well-ventilated outdoor space is the safer choice. Never store it in a living area.

Should I drain the fuel before summer storage?

The owner's manual decides. It may tell you to drain the fuel system or add a stabilizer. Follow that text exactly. The listing will not give this advice.

How do I keep the battery charged during storage?

The manual will describe a method, often a battery maintainer or periodic charging. Use the tool it names. A battery can discharge over weeks, so follow the schedule.

Is it okay to run the generator in the summer heat?

Run it outdoors only, far from windows, doors, and vents, per the CPSC. Heat does not change the carbon monoxide rule. The manual may have temperature limits for operation.

What does the listing tell me about storage?

The listing names the fuel type, starter type, and features like a fuel gauge or hour meter. Those terms point you to the manual's storage advice, but the manual is the authority.