String inverter
A string inverter is a vital component of a solar power system that converts the direct current (DC) produced by solar panels into alternating current (AC) for residential, commercial, and industrial use. It is called a “string” inverter because it connects a series (or string) of solar panels. These inverters are widely used for their cost-effectiveness, ease of installation, and reliability.
How String Inverter Works
String inverters connect to multiple solar panels wired in series to form a string. The DC electricity generated by the panels is transmitted to the string inverter, where it is converted into AC electricity. This AC power can then be used to run household appliances or fed back into the grid. The inverter also monitors the performance of the panels and adjusts output to optimize energy conversion.
Key steps:
- Solar panels capture sunlight and produce DC electricity.
- The string inverter receives DC power from the connected panel strings.
- The inverter converts the DC into AC suitable for standard electrical systems.
- It sends the AC electricity to the building’s main electrical panel or the grid.
comparison of Micro inverter vs string inverter vs central inverter
| Feature | String Inverter | Micro Inverter | Central Inverter |
|---|---|---|---|
| Design | One inverter for multiple panels. | One inverter per panel. | Large inverter for entire system. |
| Performance | Performance depends on the weakest panel. | Independent panel performance. | Suited for large-scale setups. |
| Cost | Affordable. | More expensive per panel. | High initial cost. |
| Maintenance | Easy but affects the whole string. | Complex for many panels. | Requires specialized maintenance. |
| Applications | Residential, small commercial. | Residential, shaded roofs. | Utility-scale installations. |
Uses and Applications for String Inverter
Residential solar systems are installed in houses that receive consistent amounts of sunlight.
Small Commercial Systems: Perfect for companies that need to use a moderate amount of energy.
Grid-Tied Systems: Able to export surplus electricity in grid-tied configurations.
Batteries are used with hybrid solar systems to provide grid backup and energy storage.
Off-Grid Systems: Combined with additional energy sources and batteries.
Major Brands of String Inverter In India
- SMA Solar Technology – Renowned for its high-quality inverters and advanced technology, SMA is a leader in the solar industry.
- Fronius – Known for innovative solar solutions, Fronius inverters are popular for their reliability and efficiency.
- Havells – A well-established Indian brand, Havells offers a range of solar products, including efficient string inverters.
- SolarEdge – Specializes in optimized solar energy solutions and is recognized for its high-performance string inverters.
- Microtek – Known for its power backup solutions, Microtek also provides reliable solar inverters suitable for residential and commercial applications.
- Luminous – Offers a variety of solar inverters and systems, catering to both residential and commercial markets.
- TATA Power Solar – A subsidiary of TATA Power, this brand offers solar solutions, including string inverters, focusing on quality and performance.
- Delta Electronics – Known for high-efficiency inverters, Delta’s products are used in various solar applications.
- Zever Solar – Offers a range of inverters known for their cost-effectiveness and reliability.
- Kaco New Energy – A global brand providing innovative string inverter solutions with a strong presence in the Indian market.
