Generator exercise in storage: a generator that never runs rarely starts when it counts.

A built-in RV generator is at its least reliable after it has done nothing for months — which in Central Florida is exactly how many rigs spend the summer in storage, and exactly backwards from when owners need it most: a storm outage, a travel day with no shore power, or an arrival week when the pedestal has a problem. Fuel ages, moisture finds its way in, and a unit that is never run under load tends to announce all of that at the first real demand. Regular exercise, done the way the generator maker directs, is how you find small issues on a calm day instead.

Why sitting is hard on a generator

• Fuel goes stale in the tank, lines, and carburetor. Gasoline in particular can varnish and gum small passages when a rig sits through Florida heat. Diesel and propane systems have their own storage considerations — follow your generator and RV manuals for the fuel you actually have. Stale-fuel no-starts are a leading theme on our generator repair page.
• Moisture and corrosion work quietly. Humidity, condensation, and insects or mud daubers in vents and exhausts are familiar Florida storage problems for every appliance on the rig, generators included. A unit that is run and looked at periodically does not get a whole summer to deteriorate unnoticed.
• Seals, hoses, and batteries age whether the unit runs or not. Starting batteries go flat, connections corrode, and rubber parts dry. Exercise runs double as a chance to see, hear, and smell anything that has changed.

Exercise it under load, on the maker’s schedule

• Follow the interval and duration in your generator manual first. Manufacturers publish specific exercise guidance for each model — how often, how long, and at what load. Use that as the rule for your unit rather than a generic interval from a forum; if you no longer have the manual, the maker’s site usually hosts it by model number.
• Run it with a real electrical load, not just idling. A generator exercised with no load can run without proving it can carry anything. Within your maker’s guidance, a substantial load — an air conditioner is the typical one in Florida, where safe and appropriate for your setup — warms the unit properly, drives moisture out, and proves the thing you actually care about: that it holds up when the AC is on.
• Let it warm up and cool down as directed. Start the load after the unit stabilises, and remove the load and let it run briefly before shutdown if your manual directs it. Note how it behaves: hard starting, hunting or surging, rough running, unusual exhaust, or shutting down under load are all findings to note with the date, not to ignore until storm season.
• Exercise it somewhere ventilated and safe, and never in an enclosed space. Generator exhaust is dangerous. Run it outdoors with exhaust directed away from openings, following all safety guidance in the manual, and respect resort or storage-lot rules about when generators may run — many storage facilities prohibit it, which means planning an exercise visit elsewhere rather than skipping the season entirely.

Fuel, oil, and the storage-month checklist

• Use a fuel stabilizer only as the fuel and generator makers direct, and plan fuel turnover. Stabilizer helps for a defined storage period; it does not rescue fuel that is already stale. If a rig will sit a full summer, ask a tech what fuel plan fits your unit before you leave, not after a no-start.
• Check oil level, air filter, and the area around the unit before each run. Look for nests, debris, leaks, and chewed or cracked lines. In Summerfield and other oak-shaded areas, debris around a parked rig is a constant — clear the compartment as the manual allows, with the unit off and cool.
• Keep the starting battery maintained. A generator with a flat starting battery, or one that depends on house batteries that have sat discharged all summer, will not start no matter how healthy the engine is. Battery care is part of the arrival order in our snowbird arrival checklist.
• Log each run. Date, duration, load used, and any odd behaviour — a simple note on your phone. That log turns a later tech visit from guesswork into diagnosis, and it proves at a glance whether the unit was exercised before a storm warning or forgotten since spring.

Before storm season, test like it matters — because it might

• Do a full loaded run well before hurricane season peaks, long enough to confirm the AC runs and stays running.
• Confirm you have the fuel, oil, and access you would need if the power went out — including knowing how to switch your rig to generator power safely using your transfer system as designed.
• If the unit surges, quits under load, or will not start after sitting, get it looked at in the calm weeks. Those symptoms and what a mobile tech can do on site are covered in our hurricane-season prep guide and the generator service page linked above.

A generator that is exercised on schedule is boring — it starts, carries the load, and shuts down cleanly. That boredom, on a storage-lot visit in a quiet month, is what buys you confidence on the one loud night you actually need it.

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By Josh Tomlinson — Josh operates Florida Mobile RV Service and writes these guides. About the service →

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