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Battery cabinets standing in a row on the Calderwatt integration floor, DC cabling run between them

Commercial & industrial BESS

Industrial battery storage, sized to your plant’s load curve

We start from your metering data, not a catalogue. Capacity, C-rate and grid interface are set per site — then integrated, commissioned and maintained under one contract.

Request a quoteService commitments
Representative site load profile shown with and without storage, against the contracted peak
Representative profile. Your own 15-minute interval data replaces this in the first week.

How we size

Three inputs decide the configuration

  1. 01

    Metering data in

    Twelve months of 15-minute interval data, your tariff structure, and the contracted peak your grid operator holds you to.

  2. 02

    Configuration out

    Usable capacity, C-rate, cabinet count and grid interface — each derived from the profile above, not picked from a range.

  3. 03

    Payback modelled

    Against your tariff, before you commit. The model travels with the quote so your finance team can check the arithmetic.

Send us a load profile
Open cabinet door showing stacked module trays, busbars and wiring looms

What the numbers turn into: module trays, busbars and looms, built to the configuration above.

Integrating since
2019
Delivered across three sites
4.6 MWh
Remote response, business days
4 h

Delivered systems

Three sites, three tariff problems

Each of the three started as a metering file and a tariff bill. What follows is what was actually commissioned.

Containerised battery unit on a concrete pad beside an industrial building
  • 2.1 MWhAutomotive components plantGermany · commissioned 2024Peak shavingmodelled payback 5.8 yr
  • 940 kWhCold-chain warehouseNetherlands · commissioned 2025Demand-charge managementmodelled payback 6.4 yr
  • 1.6 MWhInjection moulding plantBelgium · commissioned 2025Price arbitragemodelled payback 5.1 yr

Client names withheld — none of the three has released us to publish them. Capacity, country, application and commissioning year are as delivered.

When something fails

Response times we sign for

Service engineer running a commissioning check on an opened battery cabinet
Commissioning and fault attendance are done by our own engineers, not subcontracted.
Remote diagnosis
4 hours, business days
On-site attendance
Next business day, Benelux and western Germany
Spare inverter and module
Held in Rotterdam
Monitoring
Continuous, with alarms routed to your maintenance desk
Service level agreementPDF · 0.6 MB · full terms, exclusions and escalation path

Certification

What we hold, and what we don’t

Certificates are downloadable in full. Where we have not certified for a market, the row says so.

Spare power electronics modules and cable held on shelving in the parts store
StandardScopeStatusDocument
IEC 62619Cell and battery safety, industrial applicationsCertifiedIEC62619-cert.pdf 1.2 MB
IEC 62477-1Safety of power electronic converter systemsCertifiedIEC62477-cert.pdf 0.9 MB
CEEU declaration of conformity, complete systemDeclaredCE-DoC.pdf 0.4 MB
UL 9540AThermal runaway fire propagation, North AmericaNot held — we do not supply North America
Enclosures at different stages of build along the Calderwatt assembly hall

Factory acceptance

Every system is built up and tested here in full before it ships. You are welcome to attend the acceptance test.

Request a quote

Send the load profile, get the configuration

We reply within one business day with an indicative configuration and a payback range — or with the questions we need answered first.

Quote requests answered within one business day.