Configuration Diagram of 150kW/482kWh PV & Energy Storage System

✅The system is built based on the equipment’s native 480V AC architecture, requiring no additional step-up transformer and fully complying with local grid specifications of three-phase 480V, 60Hz.

The system supports PV charging, bidirectional grid power regulation and off-grid backup power supply upon grid outage. It stores electricity generated by PV during daytime and autonomously allocates power for factory consumption, mitigating unstable power supply caused by grid fluctuations on Mindanao Island. Davao features an effective peak sunshine duration of approximately 5 hours. The 150kW PV array delivers a theoretical daily power generation of 750kWh, and the energy storage system can store up to 482kWh of surplus PV power per day to fully absorb excess electricity generated by the PV system.

Working Principle Video of 150kW/482kWh PV & Energy Storage System

241kWh Outdoor Integrated Energy Storage Cabinet

Monocrystalline modules ranging from 620W to 650W are adopted for the PV array. The open-circuit voltage of a single module is 41.5V at the standard temperature of 25°C. High temperatures in summer in Davao will slightly reduce the open-circuit voltage of the modules. In this design, 18 modules are connected in series to form one string. The open-circuit voltage of each string reaches 747V under standard temperature, and the maximum open-circuit voltage under low-temperature extreme conditions in early morning is approximately 785V.

This voltage falls within the inverter’s MPPT operating range of 250V~850V and will not trigger the overvoltage protection of the equipment, ensuring long-term stable operation of the system.

The entire 150kW PV system consists of 14 module strings with around 11.16kW per string. Each string is connected to multiple independent MPPT channels of the inverter for power tracking.

The whole system adopts a hybrid grid-connected PV-ESS topology. The PV array is connected to the PV terminals of the inverter, and two parallel energy storage cabinets are connected to the inverter’s battery terminals. The AC side of the inverter connects to the plant’s 480V/60Hz busbar, linking both plant loads and the utility grid. Four well-defined operating modes are implemented:

☀️ Daytime PV Surplus Charging Mode: When sufficient sunlight is available during the day, PV power is prioritized to supply the plant’s real-time loads. Excess electricity is stored in the energy storage cabinets. Up to 482kWh of surplus power can be stored daily, and unstored surplus energy can be exported to the external grid.

🌙 Nighttime Discharging Mode: During nighttime or periods of insufficient irradiance, the energy storage system discharges power, which is converted into 480V AC power via the inverter for plant consumption. Background scheduling strategies enable autonomous power supply for the facility.

⚡ Grid Emergency Backup Mode: The system maintains bidirectional grid-connected regulation under normal grid conditions. In the event of a power outage, it can rapidly switch to off-grid mode. The PV system and energy storage jointly supply power to ensure uninterrupted operation of critical plant loads.

🔗 Parallel Balancing Control Logic for Energy Storage The two energy storage cabinets adopt daisy-chain communication via CAN bus with master-slave control logic. The inverter’s energy management system uniformly collects operational data from both units, automatically equalizes charging and discharging power, restrains circulating current in the parallel loop, and ensures consistent and balanced operation of the two energy storage units.

Davos features a tropical humid and hot climate characterized by high year-round temperatures, frequent rainfall and elevated air humidity. All equipment has undergone targeted environmental optimization.

On the energy storage side, the SW-E240 outdoor cabinet is equipped with a heating and cooling dual-mode air conditioner with an operating temperature range of -20~50°C. A built-in independent dehumidification module prevents component corrosion caused by condensation inside the cabinet under high-humidity conditions. Weather-resistant modules are adopted for the photovoltaic array, paired with anti-corrosion treated supports. Connecting cables are dedicated photovoltaic cables suitable for tropical high-temperature conditions.

The project site sits at an altitude below 1,000 meters, so no power derating is required for inverters and energy storage cabinets, enabling continuous full-power operation.

Installation Scene of PV and Energy Storage System in Davao, Philippines

Combined with the local equivalent sunshine duration of 5 hours, the 150kWp photovoltaic array delivers a theoretical daily power generation of 750kWh. Taking into account module dust accumulation, high-temperature losses, line transmission losses and other factors, the actual effective daily power generation of the system remains stable at 630~680kWh.

The total usable capacity of the energy storage system is 482kWh, with a maximum daily capacity to absorb surplus photovoltaic power of 482kWh. The overall round-trip charge-discharge efficiency is no less than 90%. The power matching configuration is reasonable. The inverter has a rated power of 150kW, and the maximum charge and discharge power of two energy storage units in parallel reaches 250kW. The upper power limit on the energy storage side exceeds the rated power of the inverter, so there is no power output bottleneck during the whole charging and discharging process of the system.

This PV-ESS system adopts a native 480V, 60Hz electrical architecture with no requirement for step-up transformers. The electrical parameters of all core equipment are mutually matched. The series voltage of photovoltaic modules falls entirely within the MPPT operating range of the inverter. The energy storage cabinets adopt a DC parallel connection scheme, fundamentally avoiding the risk of equipment damage caused by overvoltage, with well-balanced power and capacity configuration.

The integrated energy storage cabinet integrates batteries, temperature control, fire protection and BMS management functions, effectively simplifying on-site civil construction and wiring work. The equipment structure is designed for the high-temperature, high-humidity tropical climate of Davao, Philippines. The system supports both grid-tied and off-grid operating modes, greatly improving the power supply stability of the plant. Equipped with long-life lithium iron phosphate cells, the system operates stably and durably. The complete solution is accompanied by a full set of technical documents including the system single-line diagram, equipment datasheets, equipment installation and commissioning instructions, and cell cycle performance documents, which fully support project implementation.