C&I ESS + STS cabinet
C&I battery cabinets and all-in-one systems with an integrated STS / ATS transfer cabinet for backup.
Solution
Backup Power
Keep critical loads running through grid outages with fast battery-backed switchover for commercial and industrial sites.
The challenge
When the grid drops, production stops
For factories, data-critical sites and cold storage, even short outages mean lost output, spoiled goods or safety risk.
- Grid outages and voltage dips interrupt continuous processes and damage sensitive equipment.
- Diesel gensets are slow to start, costly to run and add emissions and maintenance.
- Critical loads need a fast, seamless switchover — not a manual restart.
How it works
How battery backup works
The system detects grid loss and transfers critical loads to the battery within milliseconds.
- 01
Grid monitoring
An integrated STS / ATS cabinet continuously monitors grid voltage and frequency.
- 02
Outage detected
On grid loss the system switches critical loads to battery with seamless on/off-grid transfer in ≤20 ms.
- 03
Battery supplies loads
The PCS supplies backed-up loads; PV can keep charging the battery during a prolonged outage.
- 04
Grid returns
When the grid recovers, the system resynchronises and switches back automatically.
Outcomes
System specifications
≤20 ms on/off-grid switchover
Up to 4 ESS units in parallel (STS)
PV-rechargeable extended outage cover
Product specifications are indicative for the Hithium 261 kWh C&I storage class. Project outcomes such as payback, self-consumption and demand-charge reduction depend on your site load profile, tariff and system sizing, and are confirmed in the project quote.
Sunket Supply scope
What Sunket Supply supplies
Critical-load design
Sizing of backup capacity and duration around your critical loads and acceptable downtime.
Project support
Switchover configuration, grid-code compliance and commissioning and after-sales support.
FAQ
Frequently asked
How fast is the switchover?
The integrated STS cabinet provides seamless on/off-grid switching within 20 ms, fast enough for most sensitive C&I loads.
How long can the system back up my site?
Backup duration is sized around your critical loads. With PV recharging during daytime outages, a site can stay powered well beyond a single battery discharge.
Can backup be combined with peak shaving or self-consumption?
Yes. The same system can deliver self-consumption, peak shaving and backup, with reserve capacity kept for outages.
Request a project-specific quote
Share your site profile and Sunket Supply returns a tailored quote from European stock — typically within 1–2 business days.