— UPS Runtime · Data & IT
Data hall 100 kW, 15-min hold - 140 kVA VRLA N+1
Problem. A 100 kW data hall at 0.9 power factor needs a short, dependable battery hold while the standby generator starts and takes load. The design brief is a tight battery-to-generator handover, not a long autonomy window.
Answer. Sized up from 100 kW at 0.9 PF, the tool lands on 140 kVA on a 250 kVA-class enterprise chassis, with a single VRLA string (~48 kWh) per bank. Against the 15-minute target the single string rounds up to about 17 min at 100% load, 24 min at 75% and 41 min at 50%.
02 / In depth
How this preset reads — the engineering view.
Online double-conversion sizing begins with the real load: 100 kW at 0.9 power factor, rounded up and carried +25% to the next standard tier, gives 140 kVA - fitted here on a 250 kVA-class enterprise chassis so the frame has room ahead of the installed rating.
The runtime target is 15 minutes, and a single VRLA string of roughly 48 kWh already carries the hold: the tool reports about 17 minutes at 100% load, so the bank rounds up just past target rather than sitting under it. At lighter loads the same string stretches to about 24 minutes at 75% and 41 minutes at 50%.
Redundancy here is N+1: one installed string of runtime plus a spare module. The spare protects against a single module fault - it does not add minutes, so the quoted runtime is the hold delivered by the one working bank.
Ambient is set at 30 degrees C, right at the VRLA hot-zone threshold, so effective battery life works out at about 4.5 years - the honest figure for a room running warm at 28 to 30 degrees C, and the line item that drives the replacement plan.
What this preset deliberately does not solve
- Runtime is per single bank; the N+1 spare adds fault-tolerance, not minutes.
- At 28-30 degrees C the VRLA hot-zone puts effective life near 4.5 years - plan the replacement cycle.
- A sub-15-min hold assumes a reliable generator handover; confirm the start-and-transfer window separately.
How this preset differs from its siblings
The healthcare sibling preset chases mission-critical 2N redundancy on LFP, where a single string already clears the target by a wide margin and the second bank is a fully independent path. This preset is the tight-window case: VRLA is the right chemistry for a sub-15-min hold, the single string only just rounds past the 15-minute target, and N+1 buys one-module fault-tolerance rather than a second bank. Use this one when the generator handover, not autonomy, sets the brief.
03 / Hydrated calculator
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