Quick Answer
String inverters are worth it for long-term use due to their ability to increase energy production and reduce maintenance costs, especially in larger solar arrays. They offer better efficiency and reliability compared to microinverters. However, the upfront cost is typically higher.
Cost and Efficiency Comparison
String inverters are designed to handle higher power outputs, making them more efficient for larger solar arrays. They can achieve efficiencies of up to 98% compared to microinverters, which often have efficiencies ranging from 95-97%. This difference may seem small, but it adds up over time and can result in increased energy production.
Microinverter vs String Inverter Lifespan
Microinverters typically have a lifespan of around 10-15 years, after which they may need to be replaced. String inverters, on the other hand, can last 20-25 years or more with proper maintenance. This longer lifespan means less frequent replacements and reduced maintenance costs for string inverters. For example, a 5 kW solar array with a string inverter may require only one replacement over its lifetime, whereas a microinverter system would require multiple replacements.
System Design and Installation Considerations
When designing a solar array with string inverters, it’s essential to consider the number of strings and the total system power output. A general rule of thumb is to limit the system power output to 3 kW per string inverter. This helps to maintain efficiency and reduces the risk of overheating. Additionally, installing string inverters requires a higher level of technical expertise and may require additional hardware, such as a DC disconnect switch. However, with proper installation and maintenance, string inverters can provide reliable and efficient energy production for 20 years or more.
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