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UPS battery backup

Minutes: ride through a flicker, or shut down cleanly.

Portable power stations

Hours: a charged battery, with no fuel to store.

Portable generators

Days: as long as the fuel lasts, always outdoors.

Guide 88 · Generator

Standby Generator Exercise Cycle: How Often a Home Standby Generator Should Run

Run the exercise cycle on the schedule in your owner's manual. Depending on the maker, that is weekly or monthly, per the manual, and many controllers let you change it. The short run keeps the engine and battery ready and shows problems before an outage does.

Updated Drafted and checked with AIFact-checked by the HoldBackup editorial team How this guide was made

On this page
  1. The short answer: follow the manual's interval
  2. Why a standby generator needs to exercise
  3. Exercising with load versus without load
  4. What to check after each exercise run
  5. About the listing on this page
  6. Sources

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The verdict

Buy a home standby generator with an adjustable exercise schedule and clear status alerts, and let the owner's manual decide the interval and whether it tests under load.

See the store link

What we check

  • Adjustable exercise day, time, and interval
  • Option to exercise with or without load
  • Status display or alerts after each test
  • Fuel type that suits your home's supply
  • Local dealer or installer for annual service
  • Warranty terms and service requirements
Portable inverter generator: rounded suitcase body on stub feet with a top carry handle, a fuel cap, and a front control panel with a dial, two outlets and a lit indicator

Drawing of backup power equipment.

Store link Generator

Champion Power Equipment 100837 14kW Home Standby Generator System, 200-Amp aXis Automatic Transfer Switch

One listing to compare. Check its specs against the list above before you buy.

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The unit named above, on Amazon.

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Generator safety: carbon monoxide and backfeed

Carbon monoxide: never run a generator indoors, in a garage, basement or crawlspace, or near windows, doors or vents. Using a generator indoors can kill you in minutes. Use battery-powered carbon monoxide alarms in the home. CPSC Safety Alert 5123

Backfeed: never plug a generator into a wall outlet or a dryer outlet. That is extremely dangerous: it can energize utility lines and injure line workers and people in the home. Use a transfer switch or interlock installed by a licensed electrician. CPSC Safety Alert 5123 (PDF)

The short answer: follow the manual's interval

A home standby generator runs itself on a timer, called the exercise cycle. It starts, runs for a short time, and shuts down. You do not have to do anything except watch for warnings.

The right interval is the one your maker specifies. Kohler, Generac, and Champion manuals offer weekly, every-two-weeks, or monthly settings, and you can usually set the day and time. If the manual allows a choice, the maker's default is the safe starting point.

Check the warranty terms too. Some makers tie coverage to following the maintenance and exercise schedule, so changing it without a reason can cost you.

Why a standby generator needs to exercise

A standby generator sits idle most of the time. An engine that never runs is the one that fails to start when the power drops. The exercise cycle fixes that by putting the whole system through a small test on a regular basis.

  • Shows whether the engine starts and runs on its own
  • Shows whether the starting battery can still crank the engine
  • Checks the fuel supply while you still have grid power
  • Lets you see and hear the unit run, so a new leak or noise stands out
  • Confirms the controller, starter, and engine work together
  • Surfaces fault codes while you still have grid power to fix them

Exercising with load versus without load

Many units exercise without load. The engine runs, but your house stays on utility power. This tests the engine and controller, not the full transfer to generator power.

Some systems can run a test that switches the house to generator power for a short time. That checks the transfer switch as well, but it means a brief interruption. Read your controller manual to see which test your system runs and how to start a full-load test when you want one.

Your installer or dealer can show you both tests at install time. Ask them to set the schedule and explain what each light or message means.

What to check after each exercise run

Pick an exercise time when someone is usually home, so you notice if it does not run. A missed run is the first sign of a dead battery or a fault.

Do a quick visual check now and then, and book the yearly service the manual calls for.

  • Status lights or display show ready, with no fault codes
  • The engine started and ran for its normal length
  • No new leaks, smells, or unusual noises
  • The area around the unit is clear of snow, leaves, and debris
  • Oil level and fuel supply meet the manual's guidance
  • The starting battery shows no warning

About the listing on this page

The Champion 100837 Home Standby Generator System is sold as a system with a 200-amp automatic transfer switch. Before buying, read its manual for the exercise schedule options, the fuel it needs, and its service requirements.

Do not rely on the wattage in the listing name alone. Check the spec sheet for separate running ratings by fuel type and the starting capacity, then compare those with the loads you plan to cover.

A home standby system connects to your house wiring, so a licensed electrician must install it and decide the complete connection. Local permits and placement clearances also apply, so ask your installer about both before you order.

Sources

Recorded AI check: Oct 9, 2026. The sources below may include later additions. AI checks compare factual numbers and checkable claims with web sources; they do not verify every statement.

Best inverter generator for a home outage compares units from the makers' numbers. Every guide in this class is in Portable generators.

How this guide was made

  1. Drafted and checked with AI. An AI model wrote the draft from the guide's topic. A second AI pass looked for factual numbers to check against web sources. This does not verify every statement. A draft that fails the check is held for review.
  2. Fact-checked by the HoldBackup editorial team. On , a person on the HoldBackup editorial team reviewed this guide against its sources. That is a review of the writing, not a test of any unit.
  3. General guidance only. No prices, rankings, or test results, because we have none to back them. Check any number against the maker's own spec sheet.
  4. No lab tests, and we say so. HoldBackup has not run any unit named here.
  5. The store link is not a pick for this guide. It goes to a unit in this product class that this guide does not review. Check it against the list above before you buy.
  6. Labelled store links. A store button goes straight to Amazon with HoldBackup's affiliate tag. HoldBackup counts the click. A live button carries a "paid link" label, and the disclosure sits above the first one on every guide.

Questions

How often should a home standby generator exercise?

Use the interval in your owner's manual. Depending on the unit, that is weekly or monthly, per the manual, and many controllers let you change it. If you are unsure, keep the maker's default.

Can I skip the exercise cycle to cut noise or fuel use?

It is not a good idea. The exercise run is what keeps the engine and battery ready and reveals problems early. You can usually move it to a quieter time of day instead. Check whether your warranty requires the scheduled exercise.

Does a portable generator need exercising too?

Yes, it benefits from regular runs, but you start it by hand. Follow the manual for how often and how long, and run it outdoors only, away from windows, doors, and vents, never in a garage.

What should I do if the generator misses an exercise run?

Check the status display for a fault code and look up the code in the manual. A weak starting battery is one possible cause. If the code is not something the manual lets you clear yourself, call your dealer or installer.

Where does the price button go?

Straight to Amazon. Amazon sets the price and availability, and both can change.

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