What Size Inverter Do I Need for Solar Panels?
Solar inverters are essential parts of the solar system, without which you can't convert Direct Current into Alternate Current for further use.
As they come in an extensive range of sizes, designs, and capacities, it might be difficult for a non-technical person to make an accurate choice.
However, you do not have to worry because we have your back. In this article, we will discuss all the crucial information you must know to determine the perfect size of inverter for your solar panels.
So, without any further ado, let's jump in.
Your guide to determining the perfect size of inverter for your solar panels
How does inverter sizing function?
To determine the correct inverter size for your solar panel, it is first crucial to understand how solar sizing works. It is measured in watts (W), which should be the same as your solar system's capacity.
That means the inverter size must match the total wattage your solar array can handle.
In addition, an inverter must adhere to all the solar panels' voltage specifications and current requirements.
This includes paying close attention to proper sizing and longevity and taking measures to maximize reliability.
How to calculate the size of the inverter needed for the solar panels?
You need to check the DC rating to determine the correct sizing for your inverter. This refers to checking the relationship between the output of the alternate current and the direct currents' production.
To get the exact ratio, divide the direct current of your array by the inverter's capability of withholding maximum alternate current.
For instance, if your direct current rating is 4 kW and the alternate current output is 4000 W, you must divide the 4000 by 4000. The answer will be one, which is your final Array-to-Inverter ratio.
The solar system usually works under the 1.1 to 1.25 array-to-inverter ratio. However, if your required ratio is higher than this, you can choose higher-end or customizable options.
Factors that affect the size of your solar panel
Here are some of the significant factors which can affect the size of your solar inverters.
1.The voltage specification: Different types and sizes of solar panels can have distinguished voltage specifications. So, before buying a new inverter, check the data sheets of your panels and verify their compatibility with the potential options.
2.Maximum power point tracking: Also known as MPPT tracking, the term refers to the total variations in the panel performance an inverter can handle. So, the diverse variety of variations an inverter can handle, the smaller size you need.
3.Design of the system: The design of the system also plays a crucial role in its size. Brands with fancier-looking inverters might deliver the least efficient inverter in a bulky design. Conversely, efficient brands offer multiple features within compact and sleek designs.
4.Future expansion: Your future scope is one important factor in determining the size. For instance, you determined the correct size of your inverter according to your current need. However, expanding your usage sooner will not be effective in the long run. So, when determining the size, always calculate your future consumption in the ratio and multiply it with the current need.
5.Panel orientation and shading: A panel with a higher orientation variety or partial shading can develop multiple power levels. Thus, it affects the size of the inverters needed to handle such fluctuations.
6.The power situation of your area: If your area suffers from frequent power fluctuations and power outages, you might need a larger inverter to handle the variations.
7.Battery size: Last but not least, battery size also greatly impacts the size of your solar inverter. If you have larger batteries and need to store sufficient energy as a backup, you need a larger inverter. However, if you are not planning to store energy and only need it for temporary usage, you can go with smaller inverters as well.
Oversizing and under sizing the solar inverter
Oversizing and undersizing of the inverters can have different effects on the health of your whole solar system. Here is how both situations can influence the performance of your system:
1.Undersizing your solar inverter: The undersizing of the solar inverter refers to the maximum power output the system can dictate by its size. It means that the inverter has a lower capacity than the total wattage of solar panels. This approach might be cost-effective upfront but can result in the wastage of generated energy. In addition, it also results in consistent underperformance, which can deteriorate the total battery health of your solar panel in the long run.
2.Oversizing of the solar inverter: It refers to a situation where the inverter has a higher capacity than the solar panel wattage. The oversized inverter does not have such potential losses. Instead, it can drive you with multiple benefits. First, it allows you to handle sudden power variations without safety risks and ensures a constant power supply. In addition, if you have plans for future expansion, you can go with the oversized inverters, which can handle all your future loads without needing replacement.
How to Know If Your Inverter is Too Small or Too Big
Once you've chosen an inverter, it's important to make sure it's the right size. Here’s how to tell if it's too small or too big:
Too Small: If your inverter is too small, it will struggle to convert all the power generated by your solar panels. This can result in an inefficient system and power loss, especially on sunny days when the system is generating more than the inverter can handle.
Too Big: On the flip side, if your inverter is too large for your system, you’re paying for capacity you won’t use. It also means that the inverter will operate at lower efficiency since it will not always be working at full capacity.
Common Mistakes When Choosing an Inverter Size
When selecting an inverter, there are a few common mistakes that people often make:
Underestimating Energy Losses: Failing to account for wiring losses, shading, and dirt buildup can lead to an undersized inverter. This can cause your inverter to be overloaded and operate inefficiently.
Choosing the Cheapest Option: While it’s tempting to go with a budget-friendly inverter, remember that cheaper inverters might not be as efficient or reliable. Inverters are a long-term investment, and it’s better to spend a little more on a quality model.
Overestimating Your Needs: Sometimes, people opt for an oversized inverter in an attempt to maximize energy production. However, an overly large inverter may not provide any additional benefits and can be a waste of money.
How to purchase the right size of a solar inverter?
Once you have determined the proper inverter size for your solar panel, purchasing it from a trusted source is the next step. Innotinium has multiple years of track record in providing high-quality inverters to customers. Their offering list includes:
1.IPS- H0 (EU): Comes with a total capacity of 6 kWh to 15 kWh.
2.IPS- L0 (EU): Comes with a total capacity of 3.6 kWh to 10 kWh.
3.IPS- L0 (US): Comes with a total capacity of 6 kWh to 10 kWh.
Hence, you can decide on one based on your needs and preferences.
Final thoughts
In summary, the inverter is an integral part of solar systems; without it, electricity cannot be used. However, determining the correct inverter size is essential to ensure smooth operations.
That is why we have created this guide to help you determine the size of inverter you need for your solar panels. So, make sure to read the guide from start to end before you purchase one.