Choosing the right PV inverter is one of the most crucial decisions for PV system developers and operators on a large scale. Nowadays, people are in greater need of efficient and cost-saving solar solutions. String inverters are becoming increasingly popular since they are scalable, flexible，and easy to maintain. Here we will talk about the key points you should consider when choosing a string inverter.
1. System design flexibility
One benefit of string inverters is that they are modular in system design, and in system design, they are flexible. String inverters render each group of PV panels independent, unlike centralized inverters, where all the PV panels are strung to a single large inverter. In this manner:
It can accommodate different orientations and tilt angles more easily, especially suitable for projects with rolling terrain.
It reduces the impact of shading, dust，and aging of individual PV panels on the system overall.
Because each PV group has its maximum power point tracking (MPPT), it can generate more power.
Why is this important for large-scale PV systems?
In big PV systems, the performance of thousands of PV panels must be as good as possible. With string inverters, the performance of each panel can be optimized individually, unlike in centralized inverters, where a problem with one photovoltaic panel will cause the entire system’s performance to go down, like the “barrel effect.”
2. Increase reliability and reduce downtime
Compared to centralized inverters, string inverters are more reliable. The decentralized concept greatly reduces the likelihood of system-wide downtime due to single-point failures. The major benefits are:
Local failure effect: A string inverter failure will affect only a small part of the system.
Easy troubleshooting: One can directly locate the faulty photovoltaic group, saving maintenance time and effort.
Easy to replace: String inverters are small in size and light in weight, making replacement quick and cheap.
Comparison with centralized inverters?
Centralized inverters require a dedicated distribution room and complex wiring, and installation and maintenance costs are expensive. And in case of failure, the entire system can be affected, resulting in immense losses.
3. Cost-effectiveness and maintenance advantages
Cost is an important consideration when selecting a photovoltaic inverter. Central inverters are less expensive per watt upfront, but string inverters are less expensive overall because:
Less self-consumption: Uses significantly less auxiliary power than central inverters.
Easy installation: No additional cooling room or DC combiner box is required.
Low maintenance costs: A modular system allows for faster repair without disabling the entire system.
Life cycle cost considerations
String inverters also reduce operational expenditures (OPEX) through remote monitoring and predictive maintenance. Operators receive real-time information from each PV group, which makes operations more efficient and performance- optimized.
4. Scalability for future growth
Scalability is critical for big PV systems. String inverters make it easy to expand solar plants without having to resize the facility. The major benefits include:
Gradual expansion: New inverters can be added at any time as electricity demand increases.
Compatible with different PV panels: Compatible with different PV panels: Mixing different types of PV panels is convenient for projects with different directions.
Future-proof technology: The majority of new string inverters are compatible with energy storage and smart grid solutions.
5. Improved monitoring and data analysis
String inverters can also monitor the PV system operation in real-time with high accuracy. This is especially important for large PV operators, as this allows them to accurately monitor power output and identify faults in time. Benefits:
Monitor the power output of each PV group accurately.
Predict faults, and reduce downtime and losses.
Improve energy management and overall system performance.
Conclusion
When selecting a string inverter, system flexibility, reliability, affordability, scalability ,and monitoring capability are worth taking into account. As the solar market becomes mature, string inverters are the top choice for a lot of people because they have high performance and easy maintenance. Careful consideration of the above aspects can ensure the highest ROI of your solar investment and stable long-term system operation.