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AS 3010-2017
When the Sun Doesn't Shine — Backup Generation
In remote off-grid applications — cattle stations, mine camps, island resorts, rural homesteads — a diesel or gas generator is still the backbone of the backup power system. Even as battery storage becomes more affordable, generators remain essential for extended cloudy periods, high peak loads, or critical applications where power continuity cannot be compromised.
AS 3010-2017: Electrical installations — Generating sets is the standard that governs how a generating set (genset) is electrically integrated into a building's power system — including when that system includes a solar array and battery storage.
AS 3010-2017 — Key Requirements
Generator Selection and Rating
Parameter | AS 3010 Requirement | Solar-Hybrid Implication |
|---|---|---|
Rated power | Prime or Standby rating as appropriate to the duty cycle | Off-grid gensets typically rated for Prime duty (continuous run) |
Frequency control | ±2.5% at rated load (50 Hz ±1.25 Hz) | Poor frequency control causes inverter trips — generator must be isochronous governor |
Voltage regulation | ±2.5% from no-load to full load | Automatic Voltage Regulator (AVR) mandatory for inverter compatibility |
Harmonic content (THD) | <5% THD at rated load | High THD damages inverter chargers and causes voltage distortion |
Engine sizing | Genset must handle 100% of rated electrical load | Size for peak load — not just battery charging current |
Switchgear and Load Transfer
When a generator shares a switchboard with solar inverter AC output, the interconnection must prevent both sources from operating in parallel unless the system is specifically designed for this:
A mechanical or electrical interlock between the mains/solar supply and the generator supply — simultaneous closure of both is physically prevented
An Automatic Transfer Switch (ATS) can replace manual interlocking — it monitors the primary supply and automatically starts and connects the generator when the primary fails
For hybrid inverter-chargers (Selectronic, Victron, SMA) that are designed to operate in parallel with a generator — follow the inverter manufacturer's specific wiring diagram and AS 3010 together; the inverter's current-limiting feature protects the generator from overload during battery charging
Generator Room and Acoustic Enclosures
Generator fuel storage must comply with AS 1940 (flammable liquids) — diesel day tanks of up to 250 L are permitted inside the generator room
The generator room must be ventilated to remove both combustion exhaust and cooling air — typically 2× the cooling airflow of the generator radiator
Acoustic enclosures must be rated and tested — generator noise regulations are enforced by local councils
All wiring between the generator and the switchboard must be in conduit, rated for the generator's maximum output current
Exercising and Maintenance
AS 3010 requires that standby generators be regularly exercised. For solar-hybrid systems, the generator's role makes regular testing critical:
Task | Frequency |
|---|---|
No-load run (engine warm-up) | Monthly if generator has not operated |
Full-load run (connected to building load) | Quarterly minimum — 30 minutes at >50% rated load |
Automatic start test (ATS systems) | Monthly — simulate mains failure and confirm generator starts and transfers |
Full service (oil, filters, coolant, belts) | Per manufacturer schedule — typically 250 hours or annually |
Load bank test | Every 3–5 years or after extended idle period |
Solar-Generator Integration — Best Practices
Critical Design Rule: Never connect a generator to an inverter/charger system without first confirming the inverter's maximum AC input (generator) current limit. Many inverter-chargers have a "generator current limit" setting that, if not properly configured, will cause the generator to overload during battery bulk charging. Set the AC input limit to no more than 80% of the generator's rated current at the operating power factor.
Use isochronous (constant-speed) governors — hunting and surging governors destroy inverter rectifiers
Set the generator to warm up for 2–3 minutes before the inverter connects the load
Configure the inverter's transfer relay with a short delay (0.1–0.3 s) to avoid transferring during generator voltage transients at start-up
For maximum fuel efficiency, operate the generator only when the battery is below 30–40% SoC — let the inverter-charger bulk-charge the battery at maximum rate, then disconnect the generator and let solar finish the absorption charge
Monitor generator run hours separately from solar production hours — this allows accurate tracking of fuel consumption and maintenance intervals
Final Thoughts: Building a Compliant, Reliable Solar System
The 11 Australian Standards covered in this series represent a comprehensive, interlocking framework. No single standard is sufficient on its own — a solar installation that is structurally compliant (AS 1170) but electrically non-compliant (AS 3000) is still a failed installation. Conversely, an installation that meets every electrical requirement but uses incompatible DC connectors (AS 5033) creates a fire risk that only manifests years later.
The best installers in Australia treat compliance not as a checklist to be ticked, but as a design philosophy. When every component is selected and installed to its governing standard, the resulting system is not just compliant — it is reliable, safe, and optimised to deliver its rated performance for 25+ years.
Key Takeaways for Every Solar Project:
Start with the structure — AS 1170 before panels go on the roof
Design the DC array — AS 5033 governs string sizing, voltage limits, and protection
Select cables from first principles — AS 3008, not a generic "use 6mm² for everything" rule
Wire the AC side by the Wiring Rules — AS 3000 is non-negotiable
Commission properly — AS 4777 functional tests protect both the grid and your certification
Document everything — a commissioning record is your legal proof of compliance
Engr. Jason Morales — Founder, SolarEnergyPH
