All you need to know about solar inverter capacities performance

Solar inverters can rightfully be considered the brain or the central processing unit of an entire solar energy system. This is because the inverter is tasked with the most important job of the entire system, and modern smart and hybrid solar energy solutions use the inverter for so much more than just what the name might suggest. In this blog post, we will look at and understand the importance of solar inverter capacity in solar solutions, and also understand what solar inverter capacities and performance is, and how does it play out in the importance of solar inverters.

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Now, lets start by looking at the importance of inverter performance in solar solutions. But first, lets look at what solar inverters do and what makes them so important and then we’ll talk about solar inverter capacities.

Solar inverter capacities and performance: the basics

One of the major things to consider when installing solar is the size of your solar inverter. You might have heard about ‘undersizing’ and ‘oversizing’ your solar PV system, but what does that mean? Solar inverter sizes are rated in watts (W) based on the inverter’s maximum output. Broadly, inverter capacity should be equivalent to the system’s capacity, but it’s common practice to oversize the solar array (a smaller inverter) for efficiency gains. However, this should always be within the recommended ratio. This is the reason why you may see a ‘mismatch’ between inverter size and solar panel capacity; for example, a 6.6kW system advertised with a 5kW inverter. It’s critical for an oversized system to remain within the correct ratio, as this not only impacts efficiency, but also your eligibility for government solar incentives.

How Does Solar Inverter Capacity Sizing Work?

Solar inverter sizing is rated in watts (W). As a general rule of thumb, your solar inverter wattage should be about the same as your solar array’s total capacity, within the optimal ratio. For example, a 6.6kW array typically uses a 5kW inverter. It is important to get the sizing right so your solar inverter can carry the load or handle the power of the solar system you’re attaching to it. Choosing the right solar inverter size also ensures you can get the optimal performance from your solar system.

Incorrect inverter size may result in loss of power or inefficiency in your system. If your system is too large, you may not be eligible to export power to the grid, or you may need to limit your inverter.

However, within the recommended window, it’s possible to deviate from an ‘exact match’ and even benefit from improved performance.

Are All Solar Inverters the Same Size?

No, solar inverters are not the same size, as the size you need will depend on the generation capacity of your solar array. There is no one-size-fits-all inverter, as the size affects the unit’s efficiency and larger inverters are more expensive.

Choosing the Right Capacity for a Solar Inverter

The following points need to be considered before you choose your size and start the solar inverter installation process.

• Capacity of Solar Solution

The size of your solar system or array is the main determining factor in the size of your inverter. This is because the inverter converts the array’s DC electricity into your home’s AC requirement. Typically, manufacturers indicate the inverter size recommended for their solar array, and this should be about the same within a ratio of 33%. For instance, a 6.6 kW array could theoretically be paired with a 6,600-watt inverter. However, oversizing the array is a common practice for maximum efficiency, and a 6.6kW solar PV system typically comes with a 5kW inverter.

• Sunlight

The typical climate and sunlight available throughout the day will impact the ideal inverter capacity. The positioning of your solar PV system will also affect the solar inverter size you need to purchase. Consider the orientation of your house or building, plus the angle, tilt, and position of your mount on the roof. This is especially true if planning to oversize your solar array, as fluctuations in sunlight throughout the day and timing of peak generation is a key factor to consider.

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