Which statement best describes designing microinverter and solar panel pairing based on power output?

• A. Because microinverters are a series DC string circuit, the correct minimum and maximum number must be carefully observed
• B. To claim STCs the output of each microinverter can be no less than 75% of the output of the solar panel that it is connected to
• C. Selecting solar modules with power output lower than the inverter output is a good idea because all solar panel output will always get captured
• D. The solar panel DC wattage must not exceed the microinverter input wattage to avoid damage

Answer: (D)

When designing with microinverters, the important idea is to respect the input power rating of the inverter for each connected module. In most microinverter setups, each solar panel has its own inverter, so the panel’s maximum DC wattage should not exceed what the inverter can accept on its input. If a panel can produce more power than the inverter can handle, the inverter can be overstressed, trigger protective mechanisms, overheat, or operate less efficiently, especially in hot conditions when performance derates.

The other statements don’t fit because they imply configurations or rules that don’t apply here. Microinverters are not arranged as a series DC string, so counting minimum and maximum numbers like a string design isn’t the right approach. There isn’t a universally applicable STC-based 75% rule tying panel output to inverter output. And assuming all panel output will always be captured simply because the panel is undersized relative to the inverter ignores real-world losses and protection behavior.

So, ensuring the panel’s DC wattage stays at or below the microinverter’s input wattage is the correct guideline for safe and reliable pairing.