PV Energy Storage Project for Spain

Project Overview

Located in Spain, this reliable photovoltaic and energy storage (PV+ESS) solution is engineered to resolve power supply challenges for sites without stable municipal electricity access. The system adopts a flexible hybrid design, integrating off-grid power supply capability and reserved grid-tied expansion function, which perfectly matches customers’ immediate power demand and long-term electricity upgrade planning.

The core system configuration consists of a 30kW PV inverter, an 86kWh energy storage battery pack, and 45 pieces of 550W high-efficiency solar panels. It delivers stable, sustainable, and eco-friendly power supply for off-grid scenarios while reserving full compatibility for future municipal grid connection, enabling seamless upgrade from independent power supply to grid-connected self-consumption and power export.

Operational Modes & Core Advantages

1. Off-Grid Power Backup Mode (Default Working Mode)

This mode applies to sites with no municipal power supply or during grid outages, realizing automatic intelligent switching of power supply to ensure continuous power for loads. Under normal solar irradiation conditions, the PV array absorbs solar energy and converts it into electric power, which directly supplies power for on-site loads while charging the energy storage battery system simultaneously. When solar power generation is insufficient due to cloudy weather, night time or weak light conditions, the 86kWh energy storage battery will automatically discharge to sustain the normal operation of electrical loads.

To protect battery service life and system safety, the system is equipped with an intelligent low-power protection program. Once the battery state of charge (SOC) drops below 10%, the system will automatically enter standby or shutdown mode to avoid deep battery discharge damage. It will resume automatic power supply and cyclic charging and discharging when solar power generation recovers, ensuring the long-term stable and safe operation of the entire system.

2. Reserved Grid-Tied & Off-Grid Switchable Mode (Future Expandable Function)

To cater to the customer’s future grid access demand, the system reserves a complete grid-tied upgrade solution. A anti-reflux meter can be installed on the AC input side of the 30kW PV inverter to realize safe and standardized grid connection of photovoltaic power. After the upgrade, the system supports automatic switching between grid-tied and off-grid modes.

In grid-tied operation, the system follows the priority rule of self-generation and self-consumption. Solar power is preferentially supplied to on-site loads to reduce municipal electricity consumption and save energy costs. In the future, according to local grid policies and customer demands, the system can be further optimized to realize on-grid power sales of excess photovoltaic electricity, creating additional economic benefits and maximizing the utilization rate of clean solar energy.

Detailed Project Specifications & Core Equipment

Installed Capacity

• PV Inverter Rated Power: 30kW

• Total Energy Storage System Capacity: 86kWh

Main Equipment Configuration

• PV Inverter: 1 unit of 30kW high-efficiency hybrid PV inverter, supporting off-grid operation and reserved grid-tied function

• Energy Storage Battery: 86kWh high-capacity energy storage battery pack, featuring stable discharge performance and long cycle life

• High-Voltage Cabinet: Supporting matched high-voltage cabinet for energy storage battery and inverter, ensuring safe and stable system operation

• Solar Panels: 45 pieces of 550W high-power, high-efficiency PV modules, with strong light absorption and power generation capacity

• Anti-Reflux Meter (Reserved): Professional anti-reflux protection device, used for grid-tied function upgrade to prevent reverse power transmission and ensure grid connection safety

Project Value

This customized Spanish PV energy storage system solves the problem of temporary power shortage for customers through mature off-grid power supply technology, achieving zero-carbon power supply with clean solar energy and reducing reliance on traditional fossil energy. Meanwhile, the reserved grid-tied expansion design avoids secondary investment in equipment replacement and renovation for future power demand upgrades, greatly improving the system’s service life and economic value. It is a cost-effective, flexible and sustainable new energy power supply solution suitable for off-grid and grid-upgradable scenarios in Europe.