Generators are a lifeline during outages, especially in a region like Annapolis where storms can knock out power with little warning. But a generator only works when it is called on if it has been cared for properly beforehand. That is where generator maintenance comes in. Like any electrical system, generators need regular attention, and skipping that upkeep is usually what turns a minor issue into a system failure right when you need power most.
Below, we walk through what routine generator care actually looks like, from the basics you can handle yourself to the point where it makes sense to bring in a professional.
Generator maintenance tips start with knowing your system
Generators come in a few different types, and each one has its own quirks and maintenance needs.
- Portable generators: These are mobile and versatile, typically run on gasoline, and are fairly straightforward to maintain given their occasional use.
- Standby generators: These are permanently installed and switch on automatically during an outage. They run on natural gas or propane and need regular standby generator maintenance to stay dependable.
- Inverter generators: These are compact, quieter, and more fuel-efficient, delivering the kind of stable power output that sensitive electronics need. They still require regular upkeep despite their efficiency.
Whichever type you have, know your specific model and its maintenance requirements. The manufacturer’s manual is the best source for detailed schedules and guidelines specific to your unit.
Set a regular maintenance schedule
Routine inspection is the foundation of good generator care. Catching small issues early makes them far easier and cheaper to fix than waiting until something breaks down. At minimum, plan on the following checks:
- Visual inspections: Look for leaks, corrosion, and general wear. Oil stains, coolant drips, and fuel leaks are all early warning signs worth taking seriously.
- Ventilation and clearances: Make sure the generator has enough airflow and is free of obstructions. Poor ventilation is one of the more common causes of overheating.
- Connections: Check electrical connections for visible signs of damage or corrosion. Loose connections can hurt performance and, in worse cases, damage the generator or whatever is connected to it.
An experienced owner can often spot these signs without help, but plenty of people prefer bringing in a qualified generator contractor who already knows what to look for.
Change the oil and filter on schedule
Generators need oil changes and filter replacements just like a car does, to keep internal components clean and working properly. As a general rule, change the oil every 100 to 200 hours of operation, or at least once a year. Brand-new generators should get their first service after 25 hours of use, then shift to an annual schedule from there. Always check your manufacturer’s recommendations, since service intervals vary by model.
Steps for changing the oil:
- Run the generator briefly to warm the oil so it drains more easily, following the manufacturer’s instructions.
- Turn it off and allow it to cool as directed. Disconnect the spark plug on applicable portable models to prevent accidental starting.
- Place an oil pan under the drain plug, remove the plug, and let the oil fully drain.
- Replace the drain plug and remove the old oil filter, if your model has one.
- Install a new filter, properly lubricated and tightened according to the manufacturer’s instructions.
- Refill with the manufacturer’s recommended oil type and amount.
- Restore the equipment to its specified operating condition and check for leaks before returning the generator to service.
Confirm the recommended oil type with your manufacturer. High-quality synthetic oil may be suitable for some models, but the correct oil specification for your generator should always take priority.
Check the battery and fuel system
Battery terminals and connections can corrode or loosen over time, especially on generators that do not see frequent use. Check them regularly, and use a multimeter to test voltage if you know how to do so safely. Most standby generators use a starting battery, but the required battery specifications vary by model. Follow the manufacturer’s recommendations when checking or replacing it.
Fuel system care matters just as much. A top-to-bottom review should include:
- Checking fuel levels regularly and confirming that natural gas or propane supply is sufficient for standby units.
- Inspecting fuel lines for cracks, leaks, or wear, and flagging anything that might need replacement.
- Adding fuel stabilizer for gasoline-powered units, particularly if the generator sits unused for long stretches, since stabilizer helps prevent fuel degradation.
If you notice a fuel leak or suspect a problem with a gas supply, stop using the generator and contact a qualified professional.
Take care of the cooling system and keep things clean
Overheating can shorten a generator’s life significantly, so coolant levels, hoses, and the radiator all deserve attention. If your unit is liquid-cooled rather than air-cooled, check coolant levels according to the manufacturer’s schedule and use the recommended type. Inspect radiator lines for wear or leaks, and keep the radiator clear of built-up debris using the cleaning method specified by the manufacturer.
A clean generator also runs cooler and holds up better mechanically. Wipe down the exterior regularly to clear dust, pollen, and debris, and trim back any foliage crowding an outdoor unit so airflow vents stay clear. Before cleaning, make sure the generator is shut down and safe to work around.
More generator maintenance tips: exercising the unit regularly
Running your generator periodically keeps its parts lubricated and its battery charged, and it is the best way to confirm the system will actually perform when you need it.
- Regular checks: Run the generator according to the manufacturer’s recommended exercise schedule. Some standby units have automatic exercise cycles.
- Load testing: A generator may need professional load testing to verify that it can handle its intended electrical demand. Simply letting it idle does not establish that it can carry the required load.
- Follow the manual: Manufacturers specify how often to exercise a unit and how long it should run, so check your generator’s documentation for the correct procedure.
When to bring in professional generator maintenance services
DIY checks go a long way, but they are not a full substitute for professional care. This is where professional generator maintenance services from an experienced contractor make a real difference, especially for tasks that involve deeper diagnostics or specialized testing equipment.
- Why it matters: A qualified generator technician has the tools and training to catch problems that are easy to miss during a basic visual check and to handle hazardous work safely.
- Choosing the right provider: Look for a generator service company with local experience, a solid reputation, and familiarity with your specific generator brand.
- How often to schedule it: Plan on at least one professional service visit a year, or more often if your manufacturer recommends it. Depending on the generator, service may include engine diagnostics, load bank testing, and a full system check.
For businesses, commercial generator maintenance is particularly important because an unexpected failure can interrupt operations and affect essential equipment. A planned maintenance schedule can help identify developing problems before the generator is needed.
Bringing it all together
Staying on top of generator maintenance throughout the year is what keeps your system ready when a storm actually knocks out the power. Weisman Electric Co. has spent more than 30 years serving Annapolis homeowners and businesses, offering full service for propane, natural gas, and diesel generators of various makes and models. Besides Annapolis, we also serve other locations in Maryland, including Anne Arundel County, Queen Anne’s County, Howard County, and Prince George’s County. Our team stocks parts for major manufacturers and provides warranty work for Briggs & Stratton, GE, and Generac systems, along with electrical testing, load bank testing, fuel and coolant sampling, infrared testing, and custom maintenance contracts.
If storm season is on your mind, now is a good time to schedule generator maintenance before you actually need backup power. Regular inspections and professional servicing can help you identify problems early and keep your generator prepared for an outage.
FAQs
1. What warning signs mean my generator needs professional maintenance?
Watch for difficulty starting, unusual noises or vibrations, visible leaks, warning lights, recurring error codes, or a generator that shuts down unexpectedly. These symptoms can point to different mechanical, fuel, battery, or electrical issues. Do not ignore recurring problems or attempt repairs beyond your training. Arrange a professional inspection to identify the cause before the next outage.
2. Can a generator’s battery fail even if the generator is rarely used?
Yes. A starting battery can lose its charge or deteriorate over time, even when the generator has seen little use. Extreme temperatures, loose connections, corrosion, and a failing charging system can contribute to battery problems. Include battery condition in your regular generator maintenance routine, and follow the manufacturer’s instructions for testing and replacement.
3. Does a standby generator need maintenance if it runs an automatic exercise cycle?
Yes. An exercise cycle helps confirm that the generator starts and runs, but it does not replace scheduled servicing. It may not identify problems that require oil or filter changes, battery testing, fuel system inspection, or other checks. Follow the manufacturer’s maintenance schedule and arrange professional service at the recommended intervals.
4. What is a generator load bank test, and when might it be needed?
A load bank test evaluates how a generator performs under a controlled electrical load. It can help identify performance issues that may not become apparent when the generator runs without carrying a substantial load. Whether and how often testing is appropriate depends on the generator, its use, and the manufacturer’s recommendations. A qualified service provider can advise whether it should be included in your maintenance plan.
5. Should businesses follow a different generator maintenance schedule than homeowners?
The right schedule depends on the generator’s design, operating hours, critical loads, and the manufacturer’s requirements. Businesses that depend on backup power for essential operations may need a more tailored maintenance plan, especially if the generator is used frequently or supports critical equipment. Professional generator maintenance can be scheduled around operating needs to help reduce the risk of unexpected downtime.
6. What information should I have ready when booking a generator service?
If possible, have the generator’s make, model, approximate installation date, and recent service history available. Note any warning codes, starting difficulties, unusual sounds, or other problems you have observed. Also mention whether the generator has recently operated during an outage. These details can help the service provider understand your concerns and prepare for the appointment.