Solar Inverter Sizing Guide for Maximum Efficiency
This article explains how to calculate your inverter size, what affects it, and how to avoid costly mistakes, especially when using high
Solar inverter sizing refers to choosing an inverter with the appropriate AC output for your solar panel system's DC input. It's about matching capacity and performance, without wasting energy or breaching local export limits. Inverter size is measured in kilowatts (kW). It should match your solar array within a 1.15 to 1.33 ratio.
This means your inverter doesn't need to power your entire home—it just converts whatever your panels generate. Let's say you have a 6kW solar array (twenty 300-watt panels). Your inverter needs to handle that 6kW of DC power, regardless of whether your home uses 2kW or 10kW at any given moment.
An undersized inverter can lead to clipping losses, where the excess DC power generated by the solar panels is wasted due to the inverter's inability to handle the full output. On the other hand, an oversized inverter not only increases the initial cost but can also damage the inverter itself.
Areas with higher irradiance levels may require larger inverters for the same size array due to increased power production. The process of inverter sizing involves understanding the relationship between DC (Direct Current) from the solar panels and AC (Alternating Current) required for powering appliances. The Inverter Sizing Formula is –
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