UPS size at battery run time
I-size ang UPS at ang battery nito para sa run time.
Reads AS/NZS 3000:2018. Tables checked 2 Oct 2026.
Subukan ang isang job 4
Nilalagyan ng halimbawang value ang bawat job. Palitan ang mga ito ng sarili mong value.
- Size a UPS for a comms rackThe UPS and battery to keep a comms rack and security system up for half an hour.
- Find the battery for an hour on UPSHow much battery an office rack needs to run for an hour.
- Size a UPS for a small data hallA three‑phase UPS for forty racks for ten minutes, and its input current.
- Pick a UPS for a home officeThe UPS for a computer and router to ride a short outage.
Mga input
Worked example gamit ang mga default na input.
- Mga load sa UPS
- 3 row
- Headroom para sa paglaki
- 25 %
- Output power factor ng UPS
- 0.9
- Run time sa baterya
- 15 min
- Voltage ng battery bus
- 96 V
- Efficiency ng inverter sa baterya
- 92 %
- Ageing factor
- 1.25
- Recharge time
- 8 h
- Input phases
- Single phase
- Input voltage
- 230 V
- Efficiency ng UPS sa mains
- 94 %
- Input power factor
- 0.99
Rating ng UPS, hindi bababa sa
1.86kVA
- Karaniwang laki
- 2 kVA
- Load
- 1,340W
- Enerhiya ng baterya
- 455Wh
- Kapasidad ng baterya sa bus
- 4.7Ah
- Input current
- 6.5A
Design aid lang ang resultang ito. I-verify ito laban sa kasalukuyang standard.
Mga hakbang ng kalkulasyon
- Load, real power1,340W
- Load, apparent power1,424.6VA
- kVA para sa load na may 25 % headroom1.78kVA
- kVA para sa kW nito sa UPS power factor na 0.91.86kVA
- Rating ng UPS, hindi bababa saResulta1.86kVA
- Karaniwang laki2 kVA
- Energy ng baterya para sa 15 min, kasama ang ageing455Wh
- Kapasidad ng baterya sa 96 V4.7Ah
- Input power na may recharge sa loob ng 8 h1,488W
- Input current6.5A
Tungkol sa calculator na ito
How this is calculated
A UPS has two sizes that matter: the power its inverter can deliver, and the energy its battery holds. This tool works both from a list of what the UPS supplies, then the current it draws from the supply.
You list each load with how many there are, the real power each draws in watts and its power factor. The tool adds the watts, and it adds each load's apparent power. With your headroom for growth on top, the UPS needs at least that many kVA, and its kW rating, its kVA times its output power factor, must cover the watts. The larger of the two is the rating. The tool also names the next typical size up; the sizes are common ratings, not a standard's list.
The battery must hold the load's watts for the run time, divided by the inverter's efficiency, times an ageing factor so it still lasts when old. Divided by the bus voltage that gives Ah, but at the run time's rate: a battery gives far less than its 10 or 20 hour Ah over a short run, so the maker's discharge table decides the battery.
The input is the load through the UPS's efficiency plus the power to recharge the battery in the time you set. AmpSize does not hold AS 62040, so the headroom, efficiencies and ageing factor are your assumptions. The result names the AS/NZS 3000 rules for converters.
| Step | Table or clause | What it decides |
|---|---|---|
| Load | Watts added, and each load's apparent power | The power the UPS supplies |
| Rating | The larger of the kVA and the kW at the output power factor | The UPS rating with headroom |
| Battery energy | Load times run time, over efficiency, times ageing | The energy at the battery bus |
| Battery capacity | Energy over the bus voltage, at the run time's rate | The Ah to look up in a maker's table |
| Input current | Load over efficiency, plus recharge | The current for the supply cable |
| Installation | AS/NZS 3000 Cl 4.12.4.2, Cl 4.12.5.1, Cl 4.12.5.2.2 and Cl 4.12.7 | The switch, protection, RCD and neutral rules |
Worked examples
- An office rack: two servers, three switches and storage, 15 min needs 1.86 kVA, so a 2 kVA unit, with 4.7 Ah at 96 V.
- The same rack for an hour still needs 1.86 kVA and a 2 kVA unit, but the battery holds 1,821 Wh.
- A comms rack and security system, 30 min on a 192 V battery needs 4.17 kVA, a 5 kVA unit, with 10.6 Ah at the bus.
- A small data hall of forty 1.2 kW racks, 10 min, three‑phase needs 61.86 kVA, an 80 kVA unit, drawing 76.6 A a phase.
- A home office PC and router, 10 min needs 0.51 kVA, so a 1 kVA unit.
Limits
The battery figure is the energy and Ah at the run time's rate. It does not pick cells: read the maker's constant-power discharge table at your end voltage and temperature. The tool does not model a UPS in parallel, redundancy such as N+1, the bypass supply, or a generator behind the UPS; for that, size the generator for the UPS's input.
See also: Generator sizing, Battery and Cable size.
Mga tanong
Design aid ang resulta. I-verify ito laban sa kasalukuyang standard.
Paano ko i-size ang UPS?
Idagdag ang watts ng lahat ng sinusuplayan nito, at ang VA nito. Magdagdag ng headroom para sa paglaki. Dapat kayanin ng UPS kVA ang VA, at dapat kayanin ng kW rating nito, kVA na pinarami ng output power factor, ang watts.
Gaano karaming battery ang kailangan ko para sa run time?
Ang energy ay ang load sa watts na i-multiply sa oras, hinati sa inverter efficiency, at i-multiply sa ageing factor. Hatiin sa bus voltage para makuha ang Ah, sa run time rate, at pagkatapos basahin ang discharge table ng maker.
Bakit ganoon kalayo ang Ah sa label ng battery?
Ang label ay nagbibigay ng Ah sa 10 o 20 oras. Sa loob ng 15 minuto, mas kaunti na ang ibinibigay ng parehong battery, kaya ang UPS battery ay pinipili mula sa constant-power discharge table, hindi sa label.
Anong laki ng cable ang nagpapakain sa UPS?
I-size ito para sa input current: ang load na hinati sa efficiency ng UPS, dagdag ang power para i-recharge ang battery. Ibinibigay ng tool ang current na iyon para ipasok sa cable size tool.
Ano ang sinasabi ng AS/NZS 3000 tungkol sa UPS?
Sakop ng Cl 4.12 ang converters, kasama ang UPS. Nananatiling buo ang neutral papunta sa load sa pamamagitan ng bypass, ang output protection ay nasa loob ng 15 m, at ang switch sa tabi ng battery ang nagpuputol ng supply nito.
Mga clause at table na binabasa ng tool na ito
- AS/NZS 3000:2018 Cl 4.12.4.2Switch for converter batteries
- AS/NZS 3000:2018 Cl 4.12.5.1Converter overcurrent protection
- AS/NZS 3000:2018 Cl 4.12.5.2.2RCDs on a converter output
- AS/NZS 3000:2018 Cl 4.12.7Neutral continuity through a UPS
- AS/NZS 3000:2018 Cl 4.12Electricity converters, including UPS
Bawat clause at table, kasama kung paano ito na-verify
Huling na-check ang mga table noong 2 Oct 2026.
Mga kaugnay na tool
Nakatulong ba ito?
May tanong, o may value na mukhang mali? Makipag-ugnayan sa amin.