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Battery/UPS Sizing Calculator

AS 62040 + AS/NZS 3000:2018 (Australian conditions)

✓ Phase 2 Calculator

Inputs

Typical: 15–60 minutes for graceful shutdown

▶Advanced parameters

Lead-acid: 0.5, AGM: 0.6, Lithium: 0.8+

Results

Required UPS Rating

2000

VA

Total Load: 1600W

✅

UPS Rating

VA (Limit: 2000 >=)

✅

Battery Runtime

minutes (Limit: 30 >=)

Total Load1600 W
Critical Load1200 W
Total VA (PF 0.8)2000 VA
Required Battery Capacity19 Ah
Recommended (derated)29 Ah
Number of Batteries1 × 100Ah
Estimated Runtime30 min
Important: These results are indicative only. UPS and battery systems must be designed and verified by a qualified electrical engineer in accordance with AS 62040 and AS/NZS 3000:2018 before installation.

Battery & UPS Sizing Guide — AS 62040 + AS/NZS 3000:2018

Backup power systems protect critical loads during mains failure. Proper sizing ensures the UPS and battery bank can deliver the required power (VA) and energy (Wh) for the specified runtime. This calculator determines UPS rating, battery capacity, number of batteries, and estimated runtime based on load, backup time, and derating factors.

Key Battery Types & Characteristics

  • Lead-Acid (Flooded): Lowest cost, well-established. Requires maintenance. DoD typically 50%, lifespan 5–10 years.
  • AGM (Absorbed Glass Mat): Sealed, low maintenance. Better cycle life than flooded. DoD typically 60%, lifespan 7–12 years.
  • Lithium-Ion (LiFePO₄): Highest efficiency, longest cycle life. DoD up to 80–100%. Higher cost but lower total cost of ownership over life.

UPS Types

  • Standby (Offline): Simplest, lowest cost. Slight delay when switching to battery. Best for non-critical loads.
  • Line-Interactive: Balances cost and protection. Faster response than standby. Suitable for most applications.
  • Online (Double Conversion): Highest cost, best protection. Continuous battery operation. Required for critical infrastructure.

Disclaimer: These results are indicative only. UPS and battery systems must be designed and verified by a qualified electrical engineer in accordance with AS 62040 and AS/NZS 3000:2018 before installation. Battery temperature management, aging factors, and maintenance schedules must be carefully planned.