ENERGY STORAGE SYSTEMS

BESS solutions for commercial and utility-scale projects

We select the battery, inverter or PCS and define the system control architecture based on site power requirements, load and generation profiles, grid connection conditions and the intended operating strategy.

From compact 15 kWh systems to multi-MWh projects. Depending on project requirements, we assess warranty terms, cycle life, operating conditions and the manufacturer’s Availability Guarantee.

BESS applications

A single BESS can perform several functions. Its power, capacity and control strategy are selected around the primary operating scenario.

Grid balancing

FCR, aFRR and mFRR services.

Energy arbitrage

Charging during lower-price hours, discharging when prices rise and reducing site demand peaks.

Excess solar generation storage

Increasing self-consumption and managing the permitted export power.

Backup power

Backup operation with a transfer time from 0 ms, where supported by the selected system architecture.

BESS architectures

The system architecture is selected according to the existing electrical infrastructure, PV system type, point of connection, critical loads and project scale.

Hybrid BESS system

The PV system and battery are connected to a hybrid inverter. Critical loads are supplied through the backup output, while common loads remain on the site’s main AC bus. 

The meter and CT at the point of connection measure power flows and provide data to the system controller. This solution is suitable for new or modernised PV systems where self-consumption and backup power are priorities.

AC-coupled BESS for an existing PV system

Where one or more PV systems with grid-tied inverters are already operating on site, the BESS can be connected as a separate system to the common AC bus.

The BESS with integrated PCS is controlled using meter data, so the existing PV inverters do not need to be replaced. This architecture is typically used to retrofit existing PV systems for energy arbitrage, peak shaving and increased self-consumption.

Utility-scale BESS architecture

Three battery containers are connected to a common DC bus and one power conversion container. The container integrates the PCS, transformer, RMU, communications and EMS equipment. 

The system is connected to the medium-voltage grid through the transformer and RMU. Power and capacity are increased by repeating standardised battery and power conversion blocks.

What do we assess when selecting a system?

Required power and capacity

Site load profile

Connection architecture and transformer

Battery and inverter compatibility

EMS and communication protocols

Cooling, heating and fire protection

BaltSolar helps define the system architecture and select the equipment, verify battery, inverter or PCS compatibility, assess technical constraints, and prepare the project for installation and commissioning.
We work with installers, EPC contractors, commercial and industrial clients, and energy project developers.

BESS products

Below you will find our main C&I solutions. Looking for something different? Contact us – we’ll offer a broader range of BESS products tailored to your needs.