Medha’s 3.5 MW solar inverters are designed to deliver high efficiency and reliability for large-scale solar power installations. These inverters are built to handle the demands of modern solar energy systems, ensuring optimal performance and energy yield.

Smart User Interface

The inverter features a 128 x 64 dot matrix interactive display for user data configuration and fault monitoring. Data can be downloaded via Ethernet using PC-based application software. The system supports Ethernet/SCADA for web-based monitoring and stores 30 days of internal memory data and fault information with associated data packs for any triggered event.

Advanced Technology

Medha’s 3.5 MW inverters utilize advanced three-level technology to achieve the highest efficiency over a wide operational range. Key technological features include:

1. Configurable Reactive and Power Factor Control: Ensures compliance with grid requirements.
2. Grid Side Fault Monitoring and Support: Includes LVRT, HVRT, anti-islanding, reactive power control, and power factor regulation.
3. Integrated Grid Side Current Lower Harmonic Control Algorithm: Improves power quality and system stability.

High Yield

The inverter’s dual MPPT (Maximum Power Point Tracking) enhances total yield during cloudy and shading conditions. Each MPP (1750 kW inverter) operates individually with an independent cooling circuit, maximizing energy harvest.

Key Features

1. 1500 V Outdoor Inverter: Suitable for high-voltage applications, enhancing system efficiency.
2. Integrated Array Protection: Fuses eliminate the need for additional array junction boxes, simplifying installation and maintenance.
3. Array Current Monitoring: Allows users to monitor the health of each array, ensuring optimal performance.
4. Low Harmonic Current Output: Reduces electrical noise and improves power quality.
5. Input and Output Isolation: Automatic control of switches and ACB through a control computer ensures safety and reliability.
6. DC Insulation Monitoring and Protection: Compatible with both IT systems and positive/negative grounding (TN) systems.
7. Automatic Wake-Up and Sleep Mode: Enhances operational efficiency and reduces energy consumption.

Comprehensive Protections

Medha’s 3.5 MW inverters are equipped with extensive protection features to ensure safe and reliable operation:

1. Input and Output Disconnection: DC motorized switch for input and AC circuit breaker for output disconnection, providing isolation for maintenance and safety.
2. Grid Protection: Anti-islanding protection to prevent grid instability, and voltage and frequency protection to safeguard against abnormal grid conditions.
3. DC Side Protection: DC reverse polarity protection to prevent damage from incorrect wiring and overcurrent/overvoltage protection to safeguard the DC components.
4. AC Side Protection: Short-circuit and overload protection to prevent damage to the AC components.
5. Surge Protection: DC-side Type-I and AC-side Type-II surge protection to mitigate the impact of voltage spikes.
6. Ground Fault Protection: Monitors and protects against ground faults to ensure system integrity.
7. Thermal Protection: Overtemperature and cooling failure protection to maintain optimal operating conditions.

Compliance and Standards

Medha’s 3.5 MW inverters comply with international standards, ensuring high performance and safety:

1. Efficiency Measurements: IEC 61683.
2. Environmental Testing: IEC 60068 series.
3. Electromagnetic Compatibility (EMC): IEC 61000 series.
4. Electrical Safety: IEC 62109 series.
5. Protection Against Islanding: IEC 62116 and IEEE 1547.
6. PV Systems Utility Interface: IEC 61727.

Operating Performance

1. Maximum Efficiency: 98.99% (excluding auxiliary supply).
2. Weighted Efficiency (EURO/CEC): 98.71% / 98.74%.
3. MPPT Efficiency: 99.9%.
4. Auxiliary Power Consumption: <6230 W.
5. Night Mode Power Consumption: <175 W.
6. No Load Losses: <3630 W.

Medha’s 3.5 MW solar inverters are engineered to provide superior performance, reliability, and efficiency, making them an ideal choice for large-scale solar power projects.