In Sweden and the Nordic power system, much of stability is about keeping frequency close to 50 Hz. When a plant trips or wind output shifts fast, reserves that respond in seconds are needed. Aggregated batteries, including residential systems, can play a role. ENEQUI Core acts as an EMS that can steer your storage toward lower own cost and, when conditions are met, ancillary services such as FCR.
Whether you live in Stockholm, Gothenburg or Malmö, the grid you are connected to poses the same physical challenge: small frequency deviations must be corrected before they propagate. With the right hardware and contracts, a 5–15 kWh home battery together with thousands of others can provide a measurable share of the fast power system operators need.
In short: FCR is an ancillary service where flexible resources (often batteries or hydro) within seconds raise or lower power to counter deviation from 50 Hz. It is not the same as hourly price optimization. FCR is about immediate system stability.
Svenska kraftnät and counterparts in neighbouring countries size these products from historical shortfall statistics and risk. Private batteries normally participate not in isolation but through aggregation: many small units are coordinated into a block that meets minimum requirements and telemetry. ENEQUI Core sits close to the physical plant, sends measurements and receives control signals according to the setup your supplier or aggregator offers.
For homeowners the value is twofold: you support a more robust grid and can receive compensation for the power you make available during procured hours. Exact levels follow the market, like certificates or spot, but the mechanism is clear: you trade some of the battery's cycles and standby headroom for revenue.
Three practical steps from installed hardware to having your plant participate in ancillary-service logic, without you manually watching frequency charts.
ENEQUI Core connects to the inverter, battery and metering so power and state of charge are available in real time (typically every second to a few seconds depending on device). We verify the control signal reaches the battery with enough margin for your FCR product requirements.
In the cloud you and the installer decide which services are enabled. Core always respects your bounds: minimum charge for backup, max cycles per day and windows where the battery is reserved for the home, for example evening peak load in Malmö or Gothenburg.
When the market calls for reserve, Core adjusts discharge or charge within allowed bounds. In Smart Saver you see history, savings and, where the contract allows, revenue indicators tied to ancillary services. Control logic updates roll out centrally so you don't need manual firmware swaps for every market change.
When the battery already exists for solar and backup, part of its power headroom can work the ancillary market without you trading power every hour by hand.
Your plant contributes to frequency regulation in the same 50 Hz system as Stockholm industry and northern wind, with measurable response when it matters most.
ENEQUI Core runs regulation continuously; you avoid app alerts for every small frequency shift. Human action is only needed for service or strategy changes.
Ancillary services and price optimization don't sleep. The system monitors grid, price and local load even when the house is empty, which matters for holiday homes and city apartments with batteries.
Book advice via the contact form or read more about ENEQUI Core, the hardware that brings solar, battery and control logic together in one EMS.