Case StudyA battery-free medium-voltage UPS architecture supported a large technology campus
Piller reports that NetApp changed a conventional static UPS and battery design to a diesel-coupled flywheel architecture for its Bangalore campus.
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Piller reports that NetApp changed a conventional static UPS and battery design to a diesel-coupled flywheel architecture for its Bangalore campus. [1]
Published operating context
The manufacturer source identifies the customer, application and intervention. It is the primary evidence for the project facts. Guidance for another site comes from the separately identified technical references. No manufacturer result is represented as an independent measurement.
The manufacturer case describes four 1,800 kW dynamic UPS units in an N+1 arrangement with flywheel energy storage. [1]
Figure 1: Published case sequence.
Reported challenge
Piller reports that removing the battery plant released 10,000 square feet and reduced associated cooling requirements. [1]
Operational risk is not limited to a complete outage. A voltage variation, short interruption, transfer, weakened battery, overload, high temperature or unowned alarm can interrupt the protected function. The first task for a similar project is therefore to measure load, read the event history and name the consequence of interruption.
Published response
The source reports a standalone power yard, acoustic limits and a single 35-metre exhaust chimney, but does not provide an independent energy audit or the complete as-built one-line. [1]
The published sequence shows a solution selected for one context. It does not prove that the same rating, model, runtime or architecture fits elsewhere. A new project must confirm voltage, conductors, grounding, bypass, alternate source, clearances, environment and delivery route before purchase.
Figure 2: Evidence boundary.
Engineering qualification for another site
The design register separates known, measured, customer-stated, calculated and unresolved inputs. It covers normal watts and VA, peaks, runtime, power factor, phase loading, generator, temperature, cooling, batteries, communications and the work window. An unknown that changes safety, capacity, runtime or maintainability blocks firm selection.
States to prove include normal operation, source loss, stored-energy support, alternate source, static bypass, maintenance bypass, component isolation and return to normal. For each state, the record names the load path, remaining protection, reserve, permitted duration, alarms, switching authority and rollback condition.
Implementation controls
The purchase record binds the exact model, voltage, rating, batteries, bypass, accessories, network interface, certification, warranty and startup. A substitution requires a dedicated source and a fresh check of every criterion. Custom or non-cancellable equipment receives a separate release gate.
For intervention planning, review data-centre UPS service. For equipment context, review UPS systems.
Figure 3: Case-specific decision matrix.
Reported results and measurement limits
The results above are manufacturer-reported. The public source is not an independent audit and may omit load profile, event logs, runtime tests, costs, failures, settings and observation duration. Those omissions do not disprove the published result, but they prevent conversion of that result into a guarantee for another site.
Records to carry forward
The closeout file retains the load survey, as-built one-line, models and serials, battery configuration, settings, firmware, transfer tests, alarms, deficiencies, corrections and final state. It also names the owner for alarms, updates, spares and the next lifecycle decision.
Subject-specific decision register
Four decisions govern this publication: four-unit n+1 capacity basis, flywheel bridge and generator coupling, power-yard space, acoustics and exhaust and battery-free claim and unreported evidence. They form a reviewable register instead of a generic checklist. Each row has an input, source, owner, acceptance condition and consequence when evidence is missing.
| Decision | Required evidence | Stop condition |
|---|---|---|
| Four-unit N+1 capacity basis | The critical-load basis and the four-unit N+1 capacity calculation showing one unit can be lost | Hold if the N+1 basis does not hold with one unit out at the peak load |
| Flywheel bridge and generator coupling | The flywheel bridge seconds and the medium-voltage generator start-and-couple time and scheme | Do not accept the design if the bridge is shorter than the generator start-and-couple time |
| Power-yard space, acoustics and exhaust | The power-yard footprint, the acoustic limits, and the generator exhaust and clearance against the site permit | Hold if the yard cannot meet the acoustic or exhaust-clearance limits of the permit |
| Battery-free claim and unreported evidence | What the manufacturer published case reports versus what it does not; the battery-free claim is bounded to the published evidence | Do not represent unreported figures as measured; bound the battery-free claim to the published source |
The site survey records load, source, room, environment, bypass, delivery route and operating constraints [4]. Calculations and assumptions retain units, load state and source [5]. This connection prevents a catalogue value or a case outcome from becoming the default value for a new installation.
The state register separates normal operation, source loss, stored-energy support, static bypass, maintenance bypass, isolation and return [6]. It states what supplies the load, remaining protection, energized sources, permitted duration, alarms and the point where work must stop.
Monitoring identifies card, firmware, protocols, network segment, accounts, logs and alarm owner [7]. Read-only remains the starting point. A remote command or automated shutdown requires an approved need, dependency map and tested rollback.
Commissioning establishes criteria before testing and retains measurements, events, deficiencies, corrections and final state [8]. The service agreement states response, exclusions, spares, maintenance window, report and next lifecycle decision [9].
The cited GDF field pattern is used only for the comparable-project method [10]. It does not mean that GDF performed the manufacturer case. Customer facts, products, quantities and results remain attributed to the manufacturer source.
Sources
- Piller Power Systems, NetApp Global Centre of Excellence Campus. https://www.piller.com/de-de/wp-content/uploads/2023/08/netapp-case-study.pdf
- GDF Technologies internal knowledge library, UPS Energy Storage Technology Selection. Local library: Energy Storage/Energy Storage & UPS/UPS Energy Storage Technology Selection.md
- GDF Technologies internal knowledge library, UPS Redundancy, Bypass and Concurrent Maintainability. Local library: DataCenter/UPS Redundancy, Bypass and Concurrent Maintainability.md
- GDF Technologies internal knowledge library, UPS Site Survey and Requirements Capture. Local library: UPS Solutions & Quotes/UPS Site Survey and Requirements Capture.md
- GDF Technologies internal knowledge library, UPS Engineering Calculations and Independent Design Verification. Local library: UPS Solutions & Quotes/UPS Engineering Calculations and Independent Design Verification.md
- GDF Technologies internal knowledge library, UPS Maintenance MOP Safety Boundaries and Go-No-Go Criteria. Local library: UPS Maintenance/UPS Maintenance MOP Safety Boundaries and Go-No-Go Criteria.md
- GDF Technologies internal knowledge library, UPS Monitoring Cybersecurity and Network Integration. Local library: Monitoring, SNMP & Shutdown/UPS Monitoring Cybersecurity and Network Integration.md
- GDF Technologies internal knowledge library, UPS Commissioning and Acceptance Testing. Local library: Installation & Commissioning/UPS Commissioning and Acceptance Testing.md
- GDF Technologies internal knowledge library, UPS Service SLA Design and Coverage Scoping. Local library: Service Contracts & PM Agreements/UPS Service SLA Design and Coverage Scoping.md
- GDF Technologies, GDF Field Case Library: Engineering and Quoting Patterns. Local library: UPS Solutions & Quotes/GDF Field Case Library - Engineering and Quoting Patterns.md
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