Beneath the sunshine of Águeda, Portugal, the 500kW/1075kWh user-side grid-connected/off-grid energy storage project customized by MECC for a local manufacturing enterprise has been officially put into operation. This is not only MECC's practice in expanding the European PV-storage market, but also a customized solution that addresses the factory's pain points of "high electricity costs and strict power supply requirements", setting a practical example for the application of small and medium-sized industrial and commercial PV-storage systems.

1. Project Overview: Customized Energy Solution for 24-Hour Production

The cooperative customer is a 300-employee manufacturing factory in Portugal, operating 24 hours a day in shifts with a daily average load of 150kW. High monthly electricity bills have become a major operational pressure. Previously, although the factory had a 200kW photovoltaic power station, the value of clean energy could not be fully released due to system bottlenecks.

In response, MECC designed an AC-DC integrated grid-connected/off-grid PV-storage solution: centered on a 500kW/1075kWh energy storage system, it integrates the existing 200kW and newly added 400kW photovoltaic systems through AC coupling to build a "photovoltaic + energy storage" system. This system achieves "self-generation and self-consumption, surplus electricity grid connection, and off-grid backup", covering the full-time electricity demand of the factory, which is highly aligned with Portugal's net metering policy that encourages distributed PV users to feed surplus electricity into the grid and offset electricity bills.

2. Technical Highlights: Solid Strength to Lay a Foundation for Stability and Efficiency

The technical advantages of MECC's PV-storage system accurately match the needs of the factory scenario, complying with Portugal's renewable energy grid connection technical guidelines:

Dual-Mode Coordination of PV-Storage Grid-Connected and Off-Grid: When connected to the grid, it prioritizes the consumption of photovoltaic electricity; in case of grid failure, it automatically switches to off-grid mode to ensure uninterrupted 24-hour production, which is crucial for manufacturing enterprises with continuous production needs.

Highly Integrated Design: It integrates photovoltaic, MPPT, transformer and other modules, eliminating the need for additional equipment. This design reduces costs, saves space and shortens the installation cycle, effectively lowering the project's capital expenditure.

Flexible Expansion and Strong Adaptability: It supports photovoltaic capacity expansion, can handle 100% unbalanced loads, and maintains stable power supply even when the load fluctuates, adapting to the dynamic electricity demand of manufacturing factories.

Intelligent Control Core: The self-developed BMS and EMS systems real-time optimize the charging and discharging strategy - using photovoltaic power for supply and energy storage for charging during the day, and using stored energy during nights or peak periods to reduce reliance on high-priced grid electricity. This strategy fully leverages Portugal's abundant solar resources (with an average annual sunshine duration of more than 2200 hours) to maximize energy utilization efficiency.

This solution can also be extended to scenarios such as PV-storage-diesel microgrids and off-grid islands, achieving "one solution for multiple adaptations" and meeting the diverse energy needs in different European regions.

3. Customer Benefits: Cost Reduction and Green Development Go Hand in Hand to Achieve Practical Value

After the project was put into operation, the factory's electricity consumption mode was upgraded, with remarkable benefits that align with Portugal's goals of energy structure transformation and carbon neutrality:

Maximized Clean Energy Utilization: The 600kW photovoltaic power generation is fully consumed, reducing reliance on thermal power and achieving a reduction of hundreds of tons of carbon emissions annually. This not only responds to the EU's carbon emission reduction requirements (Portugal needs to reduce greenhouse gas emissions by 55% by 2030 compared with 1990), but also helps the factory reduce costs related to carbon pricing under the EU ETS.

Significant Reduction in Electricity Expenses: By avoiding peak electricity prices, the monthly electricity bills of the factory have decreased significantly after calculation, and the long-term cost advantage is prominent. This is particularly valuable as Portugal's electricity market adopts a tiered pricing mechanism, and manufacturing enterprises face high electricity costs due to large energy consumption.

Comprehensive Guarantee of Power Supply Stability: The STS and maintenance bypass design ensures uninterrupted power supply during system maintenance or grid fluctuations, escorting the factory's continuous production and reducing losses caused by power outages.

4. Conclusion

Deeply rooted in the domestic market and expanding overseas, MECC has always focused on "improving the efficient and safe utilization of green energy". With customized solutions and technical strength, MECC provides efficient PV-storage services for global users. Taking advantage of Portugal's favorable renewable energy policies and abundant solar resources, this project has further consolidated MECC's layout in the European market.

In the future, MECC will continue to focus on the PV-storage field, create more "cost reduction + green" solutions for customers around the world, help enterprises achieve green and low-carbon transformation, and contribute to the global carbon neutrality goal.