Quick Answer
Yes, multiple string inverters can be connected in parallel, but it requires careful planning and implementation to ensure safe and efficient operation.
Compatibility Requirements
When connecting multiple string inverters in parallel, it’s essential to ensure that the inverters are compatible with each other. This includes matching the same model number, firmware version, and communication protocols. For example, if you’re using a string inverter like the SMA Sunny Tripower 12000 TL-US, you’ll want to ensure that all the inverters in the parallel configuration are the same model number and firmware version.
Design Considerations
To design a parallel inverter configuration, you’ll need to calculate the maximum DC current and DC power for each string. A common rule of thumb is to limit the DC current to 50-60% of the inverter’s maximum DC current rating. For instance, if you’re using a string inverter with a maximum DC current rating of 30A, you might limit the DC current to 15-18A. You’ll also need to account for the inverter’s efficiency, which can vary depending on the operating conditions.
Installation Guidelines
When installing multiple string inverters in parallel, it’s crucial to follow proper safety guidelines to prevent electrical shock or fire hazards. This includes ensuring that the inverters are properly grounded, using high-quality connectors and wiring, and following the manufacturer’s installation instructions. You may also need to install a parallel operation module or a communication system to ensure that the inverters can communicate with each other and the grid management system.
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