Free emergency standby generator annual service procedure
Free standby generator annual service checklist (PDF-ready). Engine service, alternator test, load test and NFPA 110 test records. Download free.
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Updated 26 Oct 2026
Standby Generator Annual Service Procedure
Annual service - building emergency standby generator (diesel, NFPA 110 test records)
Diesel Engine Full Service
Alternator
Full Load Test
Safety Shutdowns
Transfer Switch Service
Fuel System Service
Battery
Mechanical Inspections
Compliance
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Short answer
A standby generator annual service procedure records the yearly service of an emergency generator: engine oil, filters and coolant, alternator insulation resistance, a load test, safety shutdown tests, transfer switch service, fuel system and battery checks, and a records review. A generator technician does it every 12 months. Regulation 213 of the model WHS Regulations requires maintenance, inspection and, if necessary, testing following the manufacturer's recommendations.
Checked against Model WHS Regulations as at 5 December 2025 (cited within as the Work Health and Safety Regulations 2011) on by the MapTrack templates team. How we check templates
Key takeaways
- The MapTrack emergency standby generator annual service procedure contains 19 checks across 9 sections. Sections covered: Diesel Engine Full Service, Alternator, Full Load Test, Safety Shutdowns, Transfer Switch Service, Fuel System Service, Battery, Mechanical Inspections, Compliance.
- Regulation 213 sets the order: the manufacturer's recommendations, then a competent person's, then yearly inspection only where neither is reasonably practicable.
- Where NFPA 110 applies, clause 8.4.2.4 adds a yearly supplemental load test at 50 and 75 percent for diesel sets that can't meet the monthly loading.
- NFPA 110 clause 8.4.9 tests Level 1 emergency power supply systems at least once every 36 months.
- Take the full-load test duration and load steps from the manufacturer's procedure, and record voltage, frequency, current and kW at each step.
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What is an emergency standby generator annual service procedure?
A standby generator annual service is a comprehensive preventive maintenance and compliance inspection performed once every 12 months by a qualified generator technician. It includes all monthly test items (auto-start, run, engine monitoring, transfer switch, alarms) plus additional tasks that are only performed annually: full diesel engine service (oil change, all filters, coolant), alternator insulation resistance testing, a full load test at 100% rated output for a minimum of 2 hours, testing of all safety shutdowns, transfer switch servicing, fuel system maintenance (day tank cleaning, fuel polishing), battery load testing, mechanical inspections (exhaust back-pressure, vibration isolators, radiator) and an inspection and records review against NFPA 110 where it applies. The annual service is the point at which the compliance certificate and log book are updated. It is the most thorough inspection a standby generator receives and is critical for ensuring the generator will perform reliably during a real emergency.
Standby generators typically sit idle for 99 percent of their life, starting only during monthly tests or actual emergencies. This infrequent use creates unique maintenance challenges: fuel deteriorates in storage, battery capacity degrades without regular deep cycling, and seals and gaskets dry out. The annual service addresses all of these issues through comprehensive fluid replacement, full-load endurance testing and safety system verification. Without it, the generator may fail to start or sustain load when it is needed most.
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Benefits of using this emergency standby generator annual service procedure
- Proven reliability: a 2-hour full load test proves the generator can sustain continuous operation under maximum demand, not just start and run unloaded.
- Safety system verification: testing all safety shutdowns (high temp, low oil, overspeed, overcrank) confirms the generator will protect itself and connected systems during a fault condition.
- Engine longevity: annual oil, filter and coolant changes prevent the slow degradation that standby generators experience from infrequent use and long idle periods.
- Fuel quality assurance: draining and cleaning the day tank, polishing stored fuel and replacing deteriorated fuel lines prevents the most common cause of fail-to-start events: contaminated fuel.
- Compliance records: NFPA 110 requires written records of inspections, tests and maintenance where it applies, and the annual service record is the evidence building owners and insurers ask for.
- Insurance and liability: documented annual service records protect building owners and facilities managers from liability if the generator fails during an emergency.
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- Attach supplier invoices and parts receipts to each maintenance record.
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What to include in an emergency standby generator annual service procedure
This emergency standby generator annual service procedure covers 9 key areas:
- Diesel engine full service: drain and replace engine oil, replace oil filter, replace fuel filters, replace air filter, replace coolant or test concentration.
- Alternator: insulation resistance test (megger on all windings).
- Full load test: 100% rated output for minimum 2 hours, record voltage, frequency, amps and kW throughout.
- Safety shutdowns: test all automatic shutdowns (high coolant temp, low oil pressure, overspeed, overcrank).
- Transfer switch service: exercise, clean contacts, check voltage and frequency sensing.
- Fuel system service: drain and clean day tank, replace fuel lines if deteriorated, fuel polishing if long-term storage.
- Battery: load test (replace if CCA below spec).
- Mechanical inspections: exhaust back-pressure measurement, vibration isolator mounts, radiator (clean core, check hoses, pressure test), fire damper on exhaust.
- Compliance: inspection and test records per NFPA 110 where it applies, update the log book.
How to use this emergency standby generator annual service procedure
- Notify building management and schedule sufficient time (6-10 hours). Ensure a qualified generator technician is assigned. Arrange a load bank if the building load is insufficient for 100% testing.: Issue a building notice at least 48 hours in advance advising occupants that the generator will be under test. Confirm the load bank delivery and connection plan. Verify the technician holds the required electrical licence for the jurisdiction.
- Complete all monthly test items first (auto-start, 30-minute run, engine monitoring, transfer switch, alarms). Use the monthly test procedure as a checklist.: Run through the standard monthly test checklist to confirm auto-start, transfer switch operation, engine monitoring and alarm verification are all satisfactory before proceeding to annual-only tasks.
- Perform the diesel engine full service: drain engine oil, replace oil filter, replace fuel filters, replace air filter, replace coolant or test glycol concentration.: Use the manufacturer-specified oil grade and filter part numbers. After filling with new oil, run the engine for five minutes and recheck the level. Test coolant glycol concentration with a refractometer and replace the coolant if the concentration is outside the 40 to 60 percent range.
- Perform the alternator insulation resistance test (megger on all windings). Record readings and compare to previous years.: Disconnect the AVR before testing. Apply 500V DC for one minute to each winding (phase to ground) and record the reading in megohms. A minimum of 1 megohm is generally acceptable. Compare results with previous years to identify any downward trend that indicates moisture ingress or insulation degradation.
- Conduct the full load test: connect the load bank (or use building load), run at 100% rated output for a minimum of 2 hours. Record voltage, frequency, amps and kW at regular intervals throughout the test.: Apply load in increments of 25 percent, allowing the engine to stabilise at each step. Record voltage, frequency, current and kilowatts every 15 minutes throughout the two-hour test. Monitor coolant temperature and oil pressure continuously. The test validates cooling system capacity under sustained full load.
- Test all safety shutdowns individually: simulate high coolant temperature, low oil pressure, overspeed and overcrank conditions. Verify the generator shuts down and the correct alarm is raised for each condition.: Each shutdown must be tested by simulating the actual fault condition, not by bypassing the sensor. Verify the engine stops, the correct alarm is displayed on the controller and the event is logged. Reset each alarm and confirm the generator returns to standby mode before testing the next shutdown.
- Service the transfer switch: exercise auto and manual operation, clean contacts, check voltage and frequency sensing. Service the fuel system: drain and clean the day tank, replace deteriorated fuel lines, perform fuel polishing if the generator has been in long-term storage.: Exercise the transfer switch through multiple auto and manual transfer cycles. Inspect contacts for pitting or carbon buildup and clean with an approved contact cleaner. Drain the day tank completely, inspect for sediment or water and flush. Replace any fuel lines showing cracking, hardening or discolouration.
- Perform the battery load test (replace if CCA is below spec). Inspect exhaust back-pressure, vibration isolator mounts, radiator (clean core, check hoses, pressure test) and fire damper.: Load-test the battery with a dedicated battery tester and compare the CCA reading against the manufacturer minimum specification. Measure exhaust back-pressure with a manometer at the test port and compare to the maximum allowable. Clean the radiator core with compressed air and pressure-test the cooling system to the cap rating. Verify the fire damper operates freely.
- Complete the inspection and records review per NFPA 110 where it applies. Update the compliance certificate and log book. Record any defects, recommendations or parts replaced in the notes section. Set the next monthly test and annual service due dates and sign off.: Review the NFPA 110 maintenance and testing items to confirm each one has been addressed. Update the compliance certificate with the service date, technician details and next due date. Record all test results, parts replaced and any recommendations for capital works in the notes section.
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Get the free templateEnter your email above to download the full emergency standby generator annual service procedure as a PDF.Back to download formHow often should you complete this service procedure?
Standby generators should receive a comprehensive annual service once every 12 months. This is the most thorough scheduled maintenance event and includes a full diesel engine service, alternator insulation testing, full load test at 100 percent rated output for a minimum of 2 hours, all safety shutdown tests, transfer switch service, fuel system maintenance, battery load test and an inspection and records review against NFPA 110.
Between annual services, NFPA 110 calls for a monthly exercise of at least 30 minutes under load, covering auto-start, 30-minute run, engine monitoring, transfer switch test and alarm verification. Some building classifications or jurisdictions may require quarterly load testing in addition to the annual full load test. Always check the specific requirements for your building class and state or territory.
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Frequently asked questions
Applicable regulatory standards
This template is a starting point. Check the current requirements that apply to your equipment, work and location. The template alone does not establish compliance.
| Standard | Edition | Clauses this template relies on | Source |
|---|---|---|---|
| Model Work Health and Safety RegulationsCompetent-person maintenance and testing following the manufacturer, then a competent person; yearly inspection only where neither is practicable. | Model WHS Regulations as at 5 December 2025 (cited within as the Work Health and Safety Regulations 2011) |
| Safe Work Australia (drafted by the Parliamentary Counsel's Committee) |
| Standard for Emergency and Standby Power SystemsWhere NFPA 110 is adopted: monthly exercise, annual supplemental load test for underloaded diesel sets, 36-month Level 1 test, records. | NFPA 110, 2025 edition |
| National Fire Protection Association (NFPA)Sold by the publisher |
| Electrical installations - Generating setsInstallation requirements for permanently connected generating sets supplying safety and essential services. | AS/NZS 3010:2017 (incl. Amd 1:2020) |
| Standards Australia and Standards New ZealandSold by the publisher |
| Model Code of Practice: Managing risks of plant in the workplaceMaintenance by competent people to the manufacturer's instructions, and isolating energy sources before the work. | November 2024 version (reviewed May 2018; amended 2021, 2023 and 2024) |
| Safe Work Australia |
| IEEE Recommended Practice for Testing Insulation Resistance of Electric MachineryRecommended practice for insulation resistance testing of electric machinery, for the alternator megger test. IEEE lists it as inactive-reserved. | IEEE 43-2013 | Whole instrument | IEEE Standards AssociationSold by the publisher |
Model Work Health and Safety Regulations
Edition: Model WHS Regulations as at 5 December 2025 (cited within as the Work Health and Safety Regulations 2011)
Competent-person maintenance and testing following the manufacturer, then a competent person; yearly inspection only where neither is practicable.
- reg 213: Plant must be maintained, inspected and, if necessary, tested by a competent person, following manufacturer or competent person recommendations; annual inspection applies only if neither is practicable.
Safe Work Australia (drafted by the Parliamentary Counsel's Committee)
Standard for Emergency and Standby Power Systems
Edition: NFPA 110, 2025 edition
Where NFPA 110 is adopted: monthly exercise, annual supplemental load test for underloaded diesel sets, 36-month Level 1 test, records.
- 8.4.2: Generators in service exercised at least monthly for at least 30 minutes, using one of the listed loading methods.
- 8.4.2.4: Diesel sets that cannot meet the monthly loading are exercised monthly and load tested annually with supplemental load at 50 and 75 percent.
- 8.4.9: Level 1 emergency power supply systems tested at least once in every 36 months.
- 8.5: Records of maintenance, inspection and testing of the emergency power supply system.
National Fire Protection Association (NFPA)Sold by the publisher
Electrical installations - Generating sets
Edition: AS/NZS 3010:2017 (incl. Amd 1:2020)
Installation requirements for permanently connected generating sets supplying safety and essential services.
- 3.5: Additional requirements for permanently connected generating sets supplying safety and essential services
Standards Australia and Standards New ZealandSold by the publisher
Model Code of Practice: Managing risks of plant in the workplace
Edition: November 2024 version (reviewed May 2018; amended 2021, 2023 and 2024)
Maintenance by competent people to the manufacturer's instructions, and isolating energy sources before the work.
- Section 3.6: Maintenance, repair and cleaning of plant, following manufacturer instructions and by competent people.
- Section 4.5: Isolating energy sources before maintenance, repair or cleaning, with lock-out as the most effective isolation procedure.
IEEE Recommended Practice for Testing Insulation Resistance of Electric Machinery
Edition: IEEE 43-2013
Recommended practice for insulation resistance testing of electric machinery, for the alternator megger test. IEEE lists it as inactive-reserved.
IEEE Standards AssociationSold by the publisher
Each source was read at its publisher and the page checked on 26 October 2026. The publisher's current text is the authority.
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<p style="font-size:12px;font-weight:700;letter-spacing:0.05em;text-transform:uppercase;color:#071D49;margin:0;">Free template</p>
<p style="font-size:18px;font-weight:700;color:#071D49;margin:6px 0 0;">Emergency standby generator annual service procedure</p>
<ul style="margin:12px 0 0;padding-left:18px;color:#374151;font-size:14px;line-height:1.6;">
<li style="margin:4px 0;">Diesel engine full service: drain and replace engine oil, replace oil filter, replace fuel filters, replace air filter, replace coolant or test concentration.</li>
<li style="margin:4px 0;">Alternator: insulation resistance test (megger on all windings).</li>
<li style="margin:4px 0;">Full load test: 100% rated output for minimum 2 hours, record voltage, frequency, amps and kW throughout.</li>
<li style="margin:4px 0;">Safety shutdowns: test all automatic shutdowns (high coolant temp, low oil pressure, overspeed, overcrank).</li>
<li style="margin:4px 0;">Transfer switch service: exercise, clean contacts, check voltage and frequency sensing.</li>
<li style="margin:4px 0;">Fuel system service: drain and clean day tank, replace fuel lines if deteriorated, fuel polishing if long-term storage.</li>
</ul>
<p style="font-size:13px;color:#6B7280;margin:14px 0 0;padding-top:12px;border-top:1px solid #E5E7EB;">Free <a href="https://www.maptrack.com/templates/standby-generator-annual-service" style="color:#071D49;font-weight:600;text-decoration:none;">Emergency standby generator annual service procedure</a> by MapTrack</p>
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The MapTrack emergency standby generator annual service procedure contains 19 checks across 9 sections.
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- MapTrack Emergency standby generator annual service procedure, https://www.maptrack.com/templates/standby-generator-annual-service
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- MapTrack. (2026). Emergency standby generator annual service procedure [Checklist template]. Retrieved from https://www.maptrack.com/templates/standby-generator-annual-service
Free to reuse with credit under a Creative Commons Attribution 4.0 licence. If you’d rather link straight to it, the page is https://www.maptrack.com/templates/standby-generator-annual-service.
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