— UPS Runtime · Healthcare / critical
Hospital 40 kW, 2N - 60 kVA LFP, two banks, ~64 min
Problem. A 40 kW critical-care load at 0.9 power factor needs mission-critical continuity with no single point of failure. The design driver is a fully redundant power path, not a longer battery window.
Answer. Sized up from 40 kW at 0.9 PF, the tool lands on 60 kVA on a modular cabinet with LFP batteries in a 2N arrangement - two independent banks of one string each, two strings installed in total. Runtime, quoted per single bank, is about 64 min at 100% load, 86 min at 75% and 129 min at 50%.
02 / In depth
How this preset reads — the engineering view.
Online double-conversion sizing takes the 40 kW load at 0.9 power factor, rounds up and carries +25%, giving 60 kVA on a modular cabinet - the frame that suits a phased, serviceable critical-care install.
LFP string energy is granular, so a single ~48 kWh string already delivers about 64 minutes at 100% load - comfortably past the 30-minute target - rising to about 86 minutes at 75% and 129 minutes at 50%. Because the target is already met by one string, the design driver here is redundancy, not chasing more minutes.
Redundancy is 2N: two independent banks of one string each, two strings installed in total. Runtime is quoted for one bank; the second bank is a fully independent path providing fault-tolerance, not additional autonomy.
Ambient is 32 degrees C, which sits inside the LFP 40-degree-C hot-zone, so no derate applies and effective battery life works out at about 10 years - the reason LFP is the sensible default at this runtime and tropical ambient.
What this preset deliberately does not solve
- Runtime is per single bank; the second 2N bank is a redundant path, not extra minutes.
- At 32 degrees C the LFP hot-zone is not breached, so the ~10-year life carries no derate - revisit if the room runs hotter.
- A single LFP string already clears the 30-min target; the second bank is specified for continuity, not autonomy.
How this preset differs from its siblings
The data-hall sibling preset is a tight sub-15-min hold on VRLA, where the single string only just rounds past target and N+1 buys one spare module. This preset is the opposite balance: LFP string energy alone clears the 30-minute target with room to spare, so 2N - two independent banks and paths - is specified for mission-critical continuity, not for more minutes, and the warmer-tolerant LFP chemistry holds a ~10-year life at 32 degrees C. Use this one when a redundant power path, not autonomy, is the requirement.
03 / Hydrated calculator
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