What is included in a standby generator monthly test?

A standby generator monthly test includes starting the generator on an automatic transfer signal (simulating mains failure and verifying auto-start within 10 seconds), running at rated speed for a minimum of 30 minutes, checking engine oil pressure and coolant temperature, checking battery voltage, recording fuel tank level, testing the automatic and manual transfer switches, checking load bank test results (if applicable), verifying controller alarms (common fault, mains failure, fail to start, high temp, low oil), checking the exhaust system, block heater, battery charger and fuel day tank, and recording the hour meter reading and generator room temperature. It takes approximately 45 minutes to 1 hour.

How often should a standby generator be tested?

Standby generators should be tested monthly per NFPA 110 (Emergency and Standby Power Systems) and AS 2941 (Fixed Fire Protection Installations). Monthly tests involve starting the generator, running for at least 30 minutes and verifying all automatic functions. Annual services include a full diesel engine service, alternator insulation test, full load test (100% rated output for minimum 2 hours), safety shutdown tests and compliance inspection. Some jurisdictions or building classifications may require more frequent testing.

Why does the generator need to run for 30 minutes?

Running the generator for a minimum of 30 minutes at rated speed allows the engine to reach full operating temperature, which prevents moisture build-up in the engine oil and exhaust system, exercises the fuel system and ensures the cooling system is functioning correctly. Short runs (under 15 minutes) can cause wet stacking in diesel engines, where unburnt fuel accumulates in the exhaust. NFPA 110 and AS 2941 both specify a minimum 30-minute run for monthly tests.

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Free standby generator monthly test checklist (PDF-ready). Auto-start, transfer switch, engine monitoring, alarms and NFPA 110 / AS 2941 compliance. Download free.

Last updated: 2026-03-26

Jarrod Milford

Commercial Director

Updated 26 March 2026

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What is a emergency standby generator monthly test procedure?

A standby generator monthly test is a routine operational test performed every month on building emergency standby generators (typically diesel). It verifies that the generator will start automatically on mains failure, reach rated speed, run reliably for at least 30 minutes, and transfer power correctly via the automatic transfer switch. The monthly test is required by NFPA 110 (Emergency and Standby Power Systems) and AS 2941 (Fixed Fire Protection Installations) to ensure the generator is ready to provide emergency power when needed. Unlike an annual service (which involves replacing filters, oil and performing load testing), the monthly test is primarily a functional verification with fluid level checks and recording of operating parameters.

Benefits of using this emergency standby generator monthly test procedure

Reliability when it matters: monthly testing confirms the generator will start and transfer power automatically during a real mains failure, protecting life safety systems (fire pumps, emergency lighting, lifts).
Early fault detection: checking oil pressure, coolant temperature, battery voltage and controller alarms each month catches developing issues before they cause a fail-to-start event.
Prevents wet stacking: running the generator for 30 minutes at operating temperature prevents unburnt fuel from accumulating in the exhaust system, which degrades performance over time.
Compliance: documented monthly test records demonstrate compliance with NFPA 110, AS 2941 and building authority requirements.
Insurance protection: insurers may require evidence of monthly generator testing as a condition of coverage for business interruption or essential services.
Reduced emergency costs: a monthly test costs nothing beyond labour and fuel. A generator failure during a real emergency can cost tens of thousands in damages, liability and lost revenue.

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When you digitise standby generator service procedures in MapTrack, you get:

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Take pictures or attach photos. Not possible with a paper-based form.
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Trigger work orders automatically when a fault is logged during an inspection.
Track service intervals by hours, kilometres or calendar date in one place.
Attach supplier invoices and parts receipts to each maintenance record.

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What to include in a emergency standby generator monthly test procedure

This emergency standby generator monthly test procedure covers 7 key areas:

Start-up: start generator on automatic transfer signal (simulate mains failure, verify auto-start within 10 seconds), run at rated speed for minimum 30 minutes.
Engine monitoring: check oil pressure, coolant temperature, battery voltage, record fuel tank level.
Transfer switch: test automatic transfer switch (auto transfer and retransfer), test manual transfer switch.
Load and performance: check load bank test results if exercised under load this month.
Controller and alarms: verify all controller alarms (common fault, mains failure, fail to start, high temp, low oil).
Exhaust and ancillaries: check exhaust system, block heater, battery charger, fuel day tank and transfer pump.
Records: record hour meter reading, generator room temperature, sign test log.

How to use this emergency standby generator monthly test procedure

Notify building management that a generator test is about to commence. Check that the generator room is clear and safe to enter.
Record the equipment details (make, model, rated output, voltage) and test date at the top of the form. Note the current hour meter reading.
Check that the block heater is operating (the engine should be warm). Check the battery charger float voltage. Record the fuel tank level and top up if not full.
Simulate a mains failure to trigger the automatic transfer signal. Verify the generator starts automatically within 10 seconds and the transfer switch transfers load to the generator.
Allow the generator to run at rated speed for a minimum of 30 minutes. During the run, check engine oil pressure, coolant temperature and battery voltage. Verify all readings are within specification.
Verify all generator controller alarms are functioning: common fault, mains failure, fail to start, high temperature and low oil pressure. Check the exhaust system for leaks and ensure the rain cap is operating.
Test the manual transfer switch operation. Restore mains power and verify the automatic transfer switch retransfers load back to mains.
Record the hour meter reading, generator room temperature and any defects or abnormalities in the notes section. Set the next monthly test date and sign the test log.

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Frequently asked questions

What is included in a standby generator monthly test?: A standby generator monthly test includes starting the generator on an automatic transfer signal (simulating mains failure and verifying auto-start within 10 seconds), running at rated speed for a minimum of 30 minutes, checking engine oil pressure and coolant temperature, checking battery voltage, recording fuel tank level, testing the automatic and manual transfer switches, checking load bank test results (if applicable), verifying controller alarms (common fault, mains failure, fail to start, high temp, low oil), checking the exhaust system, block heater, battery charger and fuel day tank, and recording the hour meter reading and generator room temperature. It takes approximately 45 minutes to 1 hour.
How often should a standby generator be tested?: Standby generators should be tested monthly per NFPA 110 (Emergency and Standby Power Systems) and AS 2941 (Fixed Fire Protection Installations). Monthly tests involve starting the generator, running for at least 30 minutes and verifying all automatic functions. Annual services include a full diesel engine service, alternator insulation test, full load test (100% rated output for minimum 2 hours), safety shutdown tests and compliance inspection. Some jurisdictions or building classifications may require more frequent testing.
Why does the generator need to run for 30 minutes?: Running the generator for a minimum of 30 minutes at rated speed allows the engine to reach full operating temperature, which prevents moisture build-up in the engine oil and exhaust system, exercises the fuel system and ensures the cooling system is functioning correctly. Short runs (under 15 minutes) can cause wet stacking in diesel engines, where unburnt fuel accumulates in the exhaust. NFPA 110 and AS 2941 both specify a minimum 30-minute run for monthly tests.

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