Online-Monitoring UPS & Battery Sizing

Tick the analysers in your monitoring cabinet, set the hold-up time, and get the UPS VA rating and battery Ah that will actually ride through the outage — lead-acid DoD, C-rate discharge and tropical temperature included. For QCVN 08:2023 / PERMENLHK data-continuity stations.

1Cabinet load

Tick each device and set the count. Watts marked * are "per spec book" — the tools treat them as estimates until confirmed. Intermittent loads (pump, heater) are entered at their duty factor.

Total real load— W

Backup time T^[1] (0.5–8)h

Battery chemistry^[1][3]

Load power factor^[2][4] (0.6–0.9)

Battery bank V^[1]

Ambient temp^[1] (25–45)°C

Design margin^[2] (15–30)%

Results — UPS & battery

UPS rating needed

—VA

Battery (bank V)

—Ah

Discharge C-rate

—C

Item	Value	Basis

2Battery options (nearest standard)

Option	Holds (h)	Runtime

Standard VRLA blocks: 7 / 9 / 12 / 18 / 26 / 40 / 65 Ah. Runtime = bank Wh × DoD × η × discharge-eff ÷ load. C-rate efficiency from the discharge table (0.6C/1 h → 0.6; 0.2C/4 h → 0.8; 0.1C/9 h → 0.9) [4][5].

Station bill

Item	Spec

Quote this station at factory price

Analysers and UPS hardware at the manufacturer's ex-works price — our margin comes solely from the export tax rebate. Batteries are bought locally (transport rule); this sheet gives the Ah and the tropical 2-year replacement note behind that purchase.

Request a quote for this duty ← I&C Unit 3: range selector

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Sources & parameter basis

[1]	Rack Battery / AZCalculator UPS battery calc — VA=W/pf, Ah=P·T/(V·η·DoD), lead-acid 50 % DoD, temp comp 3 %/°C.
[2]	calculator.city UPS sizing — margin 15–30 %, pf 0.8 typical, watts vs VA.
[3]	jscalc UPS runtime — usable Wh = V·Ah·DoD·η; Peukert warning.
[4]	ups88.cn battery calc — output pf 0.7, load at 70–80 % of rating, η≈0.9, C-rate discharge efficiency table, worked 38 Ah example.
[5]	Industry C-rate discharge efficiency table (0.6C/1 h → 0.6 … 0.1C/9 h → 0.9).
[6]	Jiuyuhub product data — PH6000C/PH3000C <3 W published; other loads per spec book (estimates flagged).

Full derivation and worked example: Online-Monitoring-UPS-Calculation-Sheet.md (Unit 4 of the I&C manual).

Questions about a duty, a specification, or transparent sourcing? Contact our application engineers →