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900KW / 700KWH AC Coupling Energy Storage System

Location
UK
Commercial Installation
System Type
AC Coupling
1MW AC Output · 400V
Battery
700 kWh
768V 120AH LFP · 8 Racks
Solar Panel
923 kWp
710W Half-Cell Topcon · 1,300 Panels

Project Introduction

Aurea Energy has engineered a high-capacity 900KW / 700KWH AC Coupling Energy Storage System for a commercial client in the UK. This system integrates a 923kWp solar PV array with a 737kWh LFP battery energy storage system and a 1MW PCS, delivering a complete behind-the-meter solution for self-consumption, peak shaving, and grid support.

The system operates on AC coupling architecture — the PV array feeds power through 10 × Solis 100KW G99/G100-certified on-grid string inverters, while the BESS connects via a dedicated 1,000KW PCS. This design provides maximum flexibility: the battery can charge from either solar or the grid, enabling intelligent energy management strategies that maximise financial returns under the UK's variable electricity pricing.

System Configuration

Item Specification Qty Unit Remark
PV Panel 710W Half-Cell Topcon N-Type 1,300 pieces 923kWp total
DC Combiner Box 10 lines in / 10 lines out 10 pieces Optional
Solar Panel Rack Custom mounting 1 set For 1,300 panels
On-Grid Inverter Solis 100KW · G99/G100 certified 10 pieces Tier-1 brand
Battery Module 768V 120AH LFP · with BMS 8 pieces 737.28kWh total
High Voltage Control Box BMS controller 8 piece One per rack
PCS 1000KW Power Conversion System 1 piece Bi-directional
Battery Combiner Cabinet DC aggregation & distribution 1 set With BMS & LCD display

Battery System

The 737.28kWh LFP battery system consists of 8 racks of 768V 120AH lithium battery modules with self-designed BMS. Key features include:

  • Safe & Reliable — Self-designed BMS with easy troubleshooting and problem resolution
  • Easy Installation & Maintenance — Standard rack and module format, front maintenance access
  • High Power Density — LFP battery chemistry, ≥130Wh/kg
  • Flexible Customization — Adaptable to different applications and installation environments

EMS — Intelligent Energy Management

The system is equipped with a comprehensive Energy Management System (EMS) accessible via the iESS cloud platform. Operators can monitor real-time system performance, adjust charging/discharging strategies, and receive fault alerts through any web browser — enabling remote management and optimisation of the entire installation.

Project Benefits

With over 300 projects completed, 15+ GWh deployed, and zero safety incidents, Aurea's AC coupling solution delivers proven financial and operational benefits for UK commercial energy users.

Core Functions

  • 1
    PV Absorption & Grid Stabilisation In regions where installed PV capacity has reached saturation, excess solar generation can destabilise the grid during peak hours. This system effectively absorbs surplus PV generation during peak production periods and discharges stored energy during peak consumption periods — smoothing grid impact and maximising renewable utilisation.
  • 2
    Peak Shaving & Valley Filling The UK grid operates variable time-of-use electricity pricing. The EMS charges the battery from the grid during low-tariff periods and discharges stored energy during high-tariff periods. This price arbitrage strategy significantly reduces electricity costs — directly improving the client's bottom line.

Why This System Delivers

Time-of-Use Arbitrage Charge at low tariffs, discharge at peak rates — maximising the value of every kWh stored.
Maximised Solar Self-Consumption Store excess daytime solar generation for evening and overnight use — reducing grid dependence.
Grid-Compliant Solis inverters with G99/G100 certification ensure full compliance with UK grid codes.
Scalable & Future-Proof AC coupling architecture allows independent expansion of PV or battery capacity without replacing existing equipment.

Battery Capacity Profile — 10-Year Degradation

Year Gross Capacity (MWh) Degradation AC Output Efficiency Usable Capacity (MWh)
Year 00.7498.40%85.06%0.630
Year 10.7492.01%83.05%0.615
Year 20.7488.03%82.26%0.610
Year 30.7485.32%81.57%0.604
Year 40.7484.06%80.95%0.599
Year 50.7482.75%80.35%0.595
Year 60.7481.57%79.78%0.590
Year 70.7480.35%79.22%0.586
Year 80.7479.13%78.66%0.582
Year 90.7477.91%78.12%0.578
Year 100.7476.69%77.57%0.574

Leave a Message

Whether you're evaluating a single installation or planning a large-scale rollout, send us your enquiry and we'll respond within one business day with a tailored proposal. Ask about volume discounts on system packages.

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