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 solid generator maintenance tips come 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 are mobile and versatile, typically run on gasoline, and are fairly straightforward to maintain given their occasional use.
- Standby generators are permanently installed and switch on automatically during an outage. They run on natural gas or propane and need regular maintenance to stay dependable.
- Inverter generators 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 that electrical connections are secure. 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.
Steps for changing the oil:
- Run the generator briefly to warm the oil so it drains more easily.
- Turn it off and disconnect the spark plug to avoid 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.
- Install a new filter, properly lubricated and tightened.
- Refill with the manufacturer’s recommended oil type and amount.
- Reconnect the spark plug and start the generator to check for leaks.
Confirm the recommended oil type with your manufacturer. High-quality synthetic oil is often the better long-term choice for performance and durability.
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 can. Most standby generators run on a standard 12-volt DC battery, the same type found in most cars. A thin layer of petroleum jelly or anti-corrosion spray on the terminals helps prevent buildup.
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.
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 annually and use the type your manufacturer recommends. Inspect radiator lines for wear or leaks the same way you would fuel lines, and keep the radiator clear of built-up debris using a soft brush or compressed air.
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.
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 for about 30 minutes every few months.
- Load testing: Test it under an actual load occasionally by connecting real devices, rather than just letting it idle.
- Follow the manual: Manufacturers typically specify how often to exercise a unit, so check your generator’s documentation for specifics.
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 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 licensed electrician has the tools and training to catch problems that are easy to miss during a basic visual check, and to handle any hazardous work safely.
- Choosing the right provider: Look for a generator service company with real 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. This typically covers engine diagnostics, load bank testing, and a full system check.
Bringing it all together
Staying on top of generator maintenance tips throughout the year is what keeps your system ready when a storm actually knocks out the power. Weisman Electric has spent more than 30 years serving Annapolis homeowners and businesses, offering full service for propane, natural gas, and diesel generators of every make and model. Besides Annapolis, we also serve other locations in Maryland, including locations in 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 get your generator checked before you actually need it.
FAQs
1. What are the most important generator maintenance tips for someone who is new to owning a generator?
Start with the basics: keep an eye on oil levels and change it on schedule, check battery terminals for corrosion, inspect fuel lines periodically, and run the generator every few months even when there is no outage. These habits catch most problems long before they become expensive ones.
2. How do I know if I need a generator contractor instead of handling maintenance myself?
Basic visual checks, oil changes, and battery inspections are usually manageable on your own. Anything involving load bank testing, infrared diagnostics, or internal engine work is better left to a licensed contractor who has the right equipment and training.
3. How often should a generator service company come out for maintenance?
Most manufacturers recommend at least one professional visit per year, though generators used heavily or located in harsher outdoor conditions may benefit from semi-annual service instead.
4. What happens if I skip generator maintenance services for a year or two?
Skipping maintenance increases the odds of a failure right when you need the generator most, usually during a storm. Fuel degradation, battery corrosion, and worn parts tend to compound over time, and small issues that would have been a quick fix can turn into a full system breakdown.
5. Can I exercise my generator too often, or is more always better?
There is such a thing as unnecessary wear, so it is best to follow your manufacturer’s recommended frequency rather than running it constantly. For most units, about 30 minutes every few months strikes the right balance between keeping parts lubricated and avoiding excess strain.