· Specification starter / UPS / BESS — battery-backed power
UPS / BESS — battery-backed power
scope outline.
Online-double-conversion UPS and / or LFP BESS sized to the actual load profile and ride-through requirement. Coordinated with generator-start and BMS visibility.
In scope
Load audit and runtime requirement • UPS topology — per-load / centralised / 2N • Battery sizing per chemistry (VRLA / LFP) • Generator-start coordination • BMS visibility integration
Out of scope
Generator supply (separate civil + mechanical scope) • Building electrical distribution beyond UPS output panel
· Documents required
Materials the consultant needs before specification starts.
Load list with criticality classification per load
Required ride-through duration per criticality
Generator scope if any (capacity, start time)
Site ambient temperature profile
· Site survey
Pre-design walk-through verifications.
Battery cabinet ambient — must hold below 30 °C for life
UPS room ventilation and weight-bearing capacity
Power cable route to load panels
· Deployment checklist
Engineering items every install of this discipline carries.
True online double-conversion topology
Per-load UPS for life-safety, command-control, broadcast — never shared with comfort loads
LFP chemistry preferred above 30 kWh capacity
Generator-start coordinated with BESS hold-over for the start window
BMS visibility of state-of-charge and runtime
· Coordination with other trades
Works owed to / from other disciplines.
BMS: read-only state visibility
Generator: start-up coordination
Fire: dedicated standby for fire panel
Architectural: battery room layout, cable trays
· Commissioning
Measurable artefacts produced at handover.
Full load discharge test to design ride-through duration
Generator-start rehearsal with the actual building load
Battery cell-resistance baseline survey
Bypass switch function test
· Handover
What the building team takes ownership of.
UPS / BESS configuration baseline
Battery serial / install-date register
Generator integration commissioning report
AMC visit schedule including cell-resistance survey cadence
· Risk register starter
Risks worth tracking from day zero.
Battery ambient drifting above 30 °C and accelerating capacity loss
Generator coordination failure on a real outage event
Load growth past design capacity without UPS upsizing
· Exclusions and assumptions
What is not in scope; what we assume to be true.
Excludes generator supply and civil works
Assumes building electrical SLD is finalised
· Where to go next