A solar power plant (SPP) is more than just panels installed on a roof or ground-mounted structure. Stable operation requires power conversion equipment, mounting systems, cables, protection devices, and, where backup power is required, batteries. The system configuration depends on the facility’s capacity and operating mode.
Main Components of a Solar Power Plant
A solar power plant operates as an integrated system in which each component performs a specific function — from energy generation and conversion to storage and safe delivery to consumers. The configuration may vary depending on the plant capacity, connection type, and the need for backup power.
Solar Panels — Source of Electricity
Photovoltaic modules convert solar radiation into direct current (DC). The panels are connected into strings to form a solar array with the required capacity. The number of modules is calculated based on electricity consumption, available installation area, orientation, and expected generation.
Inverter — Power Conversion Device
The inverter converts direct current from the solar panels into alternating current (AC) at 230 or 400 V to supply electrical equipment. Grid-tied models operate together with the external grid, off-grid models work with batteries, while hybrid inverters combine solar generation, battery storage, and the grid.
Battery Storage — Energy Storage
Batteries store surplus solar energy and supply it in the evening, at night, or during power outages. When selecting batteries, factors such as capacity in kWh, discharge power, depth of discharge, cycle life, and inverter compatibility are taken into account. Batteries may not be required in a grid-connected solar power plant without backup functionality.
Solar Panel Mounting System
Mounting systems secure modules to pitched or flat roofs or ground-mounted structures. They must withstand wind and snow loads, maintain the specified tilt angle, and provide reliable panel fixation.
Cables and Electrical Connections
Solar cables, connectors, and distribution components connect the solar array, inverter, batteries, and electrical switchboard. Cable cross-sections are calculated based on current, cable length, and permissible losses. On the DC side, components rated for direct current are used.
Solar Power Plant Protection Systems
Solar power plants use circuit breakers, fuses, surge protection devices, disconnectors, and grounding systems. These components protect equipment and cables against short circuits, overloads, and transient overvoltages.
BESS Systems as Part of a Solar Power Plant: Energy Storage and Efficient Energy Use
Commercial and industrial solar power plants can use BESS, or Battery Energy Storage Systems. In all-in-one solutions, battery modules, a bidirectional converter, BMS, control system, and key protection components are integrated into a single cabinet or container. Once a compatible solar array is connected, such a system becomes the foundation of a hybrid solar power plant.
BESS systems are particularly relevant for facilities with capacities starting from 50 kW. They allow businesses to store daytime surpluses, shift consumption to the evening, reduce peak loads, and maintain power supply during grid outages.
What Determines the Configuration of a Solar Power Plant?
The equipment configuration is determined by the facility’s specific requirements:
- grid-connected solar power plant — panels, grid-tied inverter, mounting system, cables, protection equipment, and metering;
- off-grid system — panels, off-grid inverter, and batteries;
- hybrid system — solar array, hybrid inverter, battery storage, and grid connection;
- industrial solar power plant with BESS — solar array, energy storage system, and protection equipment.
The higher the plant capacity, the more important the design of PV strings, cable lines, protection systems, and operating modes becomes.
What Does a Typical Solar Power Plant Configuration Look Like?
The basic chain is as follows: solar panels — DC protection — inverter — AC protection — load and external grid. In a hybrid system, a battery is additionally connected. In an industrial solar power plant with BESS, the storage system operates as a controlled node between generation, load, and the grid.
How to Choose Equipment for a Solar Power Plant
The equipment should be selected as an integrated system. It is necessary to determine the solar power plant capacity, operating voltages and currents, maximum load, backup requirements, required level of energy autonomy, and grid connection conditions.
Compatibility between the solar panels, inverter, and batteries is particularly important. For businesses, the hourly load profile should also be analyzed. It shows how much solar energy will be consumed immediately and how much should be stored in the BESS.
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