03 / 03
Case file
Lithium-ion Battery Energy Storage Systems — installed alongside online UPS, paired with rooftop solar, or stand-alone — for peak-shave, demand-response, off-peak tariff arbitrage and ride-through. The same battery, working three shifts.
/ The discipline, in detail
How we approach battery energy storage (bess).
BESS is what changes the economics of premium and mission-critical power. A traditional UPS battery sits idle 99% of the time, waiting for the grid to fail; a BESS-coupled deployment uses that same chemistry as an energy asset — discharging into the building during peak-tariff hours to reduce demand charges, absorbing surplus rooftop solar that would otherwise be exported below cost, and acting as the ride-through buffer when the grid actually does drop.
We design BESS at three scales. Building-level (50–500 kWh) for premium residential, hospitality and corporate installations where peak-tariff arbitrage and solar self-consumption are the primary case. Mission-critical (250 kWh–2 MWh) where the BESS is also the UPS battery, providing both clean-power backup and energy-asset behaviour from the same chemistry. Industrial and microgrid (2 MWh+) where we engineer in coordination with the utility and existing diesel-set infrastructure.
Lithium iron phosphate (LFP) chemistry has become the default for stationary BESS because of its thermal stability, cycle life (typically 6,000+ cycles to 80% capacity at 1C) and tolerance to deep discharge. We specify LFP almost always; NMC chemistries are reserved for specific use-cases where energy density is critical and the operating envelope is controlled. Every system ships with a battery management system that monitors cell-level voltage, temperature and impedance, balanced state-of-charge across the pack, and a full diagnostic dashboard that integrates into the building's BMS.
Payback math works for buildings that have either (a) significant peak-tariff exposure (commercial demand charges, time-of-use industrial tariffs); (b) rooftop solar with a poor export tariff; or (c) mission-critical loads where lithium displaces VRLA on lifetime cost. We model the case before quoting — typical building-level paybacks are 5–8 years, mission-critical hybrid stacks 6–10 years.
On record
Every battery energy storage (bess) engagement is documented end-to-end — design, programming, commissioning, calibration — and handed over with the files our successors would need if we were never to return.
/ Where we deploy this
Active across 5 sectors.
Battery Energy Storage (BESS) is rarely a standalone brief — it sits inside a wider sector practice with its own codes, expectations and operating rhythm.
/ Sister services
The rest of bms.
A serious brief usually crosses two or three of these. Read across the discipline — we deliver them as one contract.
- 01
Building Management System (BMS)
The building, on a single dashboard.
Open-protocol BMS frameworks — HVAC, lighting, fire and access integrated to a single graphical front-end with operator analytics and alarm escalation.0 - 02
Online UPS
Clean power, isolated from grid reality.
Double-conversion online UPS — continuous AC-to-DC-to-AC rectification that delivers regulated sine to your load with zero transfer time and complete isolation from grid sag, surge, harmonics and frequency drift.1
/ Frequently asked
Battery Energy Storage (BESS) — what buyers ask first.
What's the difference between BESS and a UPS battery?
A UPS battery sits idle waiting for grid failure; a BESS is sized larger and controlled to discharge during peak-tariff hours, absorb solar and provide backup — same chemistry, three shifts. A UPS battery exists to bridge the gap between mains failure and generator startup; it sits idle the rest of the time. A BESS is sized larger and controlled by a smarter inverter that allows it to discharge into the building during peak-tariff hours, absorb surplus solar, and provide grid services in addition to backup. The same lithium chemistry can do both jobs in a hybrid topology — that's what we mean by 'three shifts'.
What's the typical payback period?
BESS payback runs 5–8 years for buildings with significant peak-demand charges, 4–7 years where rooftop solar export tariff is poor, and 6–10 years for mission-critical hybrid topology. It depends on tariff exposure. peak-shave alone can return 5–8 years. For a building with poor-export-tariff rooftop solar, self-consumption shifts that to 4–7 years. For mission-critical hybrid topology where the BESS is also the UPS battery, the case is built on lifetime-cost displacement of VRLA — typically 6–10 year total cost of ownership advantage.
What chemistry should we specify — LFP or NMC?
Specify LFP (lithium iron phosphate) for stationary BESS — better thermal stability, longer cycle life, lower fire risk; NMC only for weight-or-footprint-critical applications. LFP is the default for stationary BESS. Better thermal stability, longer cycle life, more tolerant of deep discharge, lower fire-risk. NMC (nickel manganese cobalt) has higher energy density per kg and is appropriate where weight or footprint is critical and operating temperature is controlled. For 95% of the buildings we engineer, LFP is the right answer.
How long does a BESS last?
An LFP BESS lasts 16+ years cycled once daily for peak-shave or 8–10 years cycled twice daily for arbitrage — 6,000+ cycles at 1C discharge to 80% retained capacity. 6,000+ cycles at 1C discharge to 80% retained capacity. Cycled once per day for peak-shave that's roughly 16+ years; cycled twice per day for arbitrage closer to 8–10 years. We specify and warranty against actual usage profile, not against an idealised cycle count.
Can a BESS run a building entirely off-grid?
Yes for short windows; continuous off-grid operation needs solar generation exceeding daily consumption plus a BESS sized for night-time — that's microgrid territory. Sizing the BESS to building-level autonomy is what 'mission-critical' deployments do. For continuous off-grid operation you need solar generation that exceeds daily consumption plus a BESS sized for night-time operation; that's microgrid territory and we engineer it where the location and economics support it.
What does a BESS deployment AMC look like?
BESS AMC includes quarterly cell-bank impedance and temperature reviews, annual capacity tests, BMS firmware management and a spare-cell pool — written response targets in contract. Cell-bank impedance and temperature trend review, annual capacity-test report, BMS firmware management, balancing-routine verification, and integration health-check with the building's BMS. We hold spare-cell and BMS-board pool for active deployments; response targets are written into the contract.
· Begin
Begin a
battery energy storage (bess)
brief.
Tell us about the building, the timeline, and what success looks like a year after handover. We will reply within two working days with a written response, not a sales pitch.