What Size UPS Do I Need? | Complete UPS Sizing Guide Australia
What Size UPS Do I Need?
The correct UPS size depends on your total equipment load, required battery runtime, future growth requirements, and redundancy needs. Most small offices require a 1kVA–3kVA UPS, while server rooms often require 5kVA–20kVA systems. Data centres, healthcare facilities, telecommunications networks and industrial operations typically use three-phase UPS systems ranging from 10kVA to more than 1MW. A professional load assessment ensures the UPS can support current demand while allowing capacity for future expansion.
How to Calculate UPS Size
To size a UPS correctly you need:
- Total connected wattage
- Required runtime
- Future growth allowance
- Redundancy requirements
A UPS should never be selected solely on current load.
Typical UPS Sizes by Application
| Application | Typical UPS Size |
|---|---|
| Home Office | 650VA–1500VA |
| Small Office | 1kVA–3kVA |
| Network Cabinet | 3kVA–6kVA |
| Server Room | 6kVA–20kVA |
| Medical Facility | 10kVA–80kVA |
| Data Centre | 20kVA–1MW+ |
| Mining Facility | 20kVA–500kVA+ |
Single-Phase vs Three-Phase UPS
Single-Phase UPS
Suitable for:
- Offices
- Retail
- Small server rooms
- Communications racks
Three-Phase UPS
Suitable for:
- Data Centres
- Mining
- Healthcare
- Telecommunications
- Government Facilities
Common UPS Sizing Mistakes
- Ignoring future growth
- Undersizing battery runtime
- Not considering redundancy
- Choosing the cheapest option
Industries We Support
Indigi Power & Cooling designs UPS systems for:
- Brisbane
- Sydney
- Melbourne
- Darwin
- Regional Australia
- Papua New Guinea
- Pacific Islands
FAQ
How much spare capacity should I allow?
A minimum of 20–30% spare capacity is recommended.
Is a bigger UPS always better?
No. Oversizing can increase costs and reduce efficiency.
Can I add more batteries later?
Most commercial UPS systems support additional battery modules.
Do you supply UPS systems throughout Australia?
Yes. Indigi Power & Cooling supplies, installs and maintains UPS systems across Brisbane, Sydney, Melbourne, Darwin, Regional Australia, Papua New Guinea and the Pacific Islands.
Which UPS brands do you support?
We support and supply leading UPS brands including Eaton, Vertiv, APC, PowerShield, Socomec and other major critical power manufacturers.
Do you provide UPS battery replacement services?
Yes. We provide UPS battery testing, replacement, disposal and lifecycle planning services for both VRLA and lithium battery systems.
Can you help determine the correct UPS size for my business?
Yes. Our team can perform a load assessment and recommend the most suitable UPS solution based on your current load, runtime requirements and future growth plans.
Do you provide UPS preventative maintenance?
Yes. We offer preventative maintenance, battery testing, thermal scanning, health checks and emergency support for UPS systems throughout Australia and Papua New Guinea.
