Project Overview
This project involves the deployment of an AC-coupled photovoltaic-storage integrated system at a client’s 4S dealership in Cambodia. It incorporates a 125kW photovoltaic inverter and a newly added energy storage system, enabling dual functionality: ‘self-generation for self-consumption with surplus feed-in to the grid’ and ‘off-grid backup power’. The system design fully accounts for the client’s electricity consumption patterns (average daily usage of approximately 14.8kWh, operating hours 8:00–20:00) and supports the sale of up to 15kWh of surplus electricity to the grid daily.
- Project Details
Application
The system operates in two modes:
- Grid-connected mode:
– Daytime loads prioritise photovoltaic power;
– Excess PV generation charges storage batteries first;
– Upon battery full charge , surplus PV power may be sold to the grid (capped at 15kWh/day);
During night-time or overcast conditions, battery discharge supplies power until SOC drops below 10%, at which point the system shuts down and switches to mains supply;
Charging batteries from mains supply is prohibited.
- Off-Grid Standby Mode:
During mains power outages, the energy storage system automatically switches to off-grid operation to supply critical loads;
The system shuts down when battery discharge reaches SOC < 10%, resulting in load disconnection.
Installed Capacity
Photovoltaic side: 125kW inverter
Energy storage side: 100kW / 215kWh
Supporting equipment: 1 x 200kVA static transfer switch (STS)
Principal Equipment
Photovoltaic inverter
Power conversion system (PCS)
Static transfer switch (STS)
Battery management system (BMS)
Air conditioning
Metering equipment
Communication Interface: Reserved RS485 (PV Inverter & Grid Connection Meter)
