Request for Technical Assistance for Modifying a Solar PV Installation

[RenEngAlg]

The installation,consists of the following components:

• A 37 kWc PV array;
• An STP 50-40 inverter;
• Three Sunny Island 8.0H in a three-phase on-grid configuration, three phase single cluster;
• An Energy Meter and a Data Manager M;
• A Hoppecke OPzV 2V/2093 Ah battery bank (24 batteries connected in series).

The system currently operates with the following functions:

• Battery charging: Current and charging power: 190A / 11.2 kW;
• Excess energy production exported to the client's electrical grid, with an average export power of 20 kW;
• Nighttime lighting supply via AC coupling with the conventional grid: Discharge current and power: 180A / 8.2 kW.

The planned modification aims to:

1. Enable the battery system to function in the absence of an electrical grid (off-grid operation);
2. Ensure that the full capacity of the PV array is utilized during daylight hours (battery charging + excess energy production).

To implement these changes, we seek your expertise to:

1. Identify any necessary modifications to the existing system, including additional equipment;
2. Ensure that the system is configured in a safe and optimized manner post-modification.