Back in 2020, I came across a huge difficulty with my GTI. I installed grid-tie inverters three years ago and was pretty much happy with their performance. However, the problem started to sprawl up due to poor sunlight.
Then, I consulted an engineer to integrate an additional inverter. To my surprise, he recommended installing a smaller one and to connect the grid. He also added, having two grid-tie inverters is actually a smart choice.
Here, in this article, I will share my experience. Moreover, I would like to help you guys to clear your doubts related to a grid-tie inverter.
Here is the Quick answer: Can you use two grid tie inverters at the same time?
Yes, it is possible to use two grid-tie inverters together to power a load. To use two grid-tie inverters together, you will need to connect them to the main power grid and to the load, and configure them according to the manufacturer’s instructions.
How to integrate two grid-tie inverters?
Functionally, the grid-tie suggests you need some additional resources of backup power.
Grid-tie inverters are truly energy efficient. Their peak efficiency ranges from around 94% to 96%, which is great.
Hence, its additional perks triggered my decision when I switched grid-tie inverter. The two inverters need to be synced to supply the power and feed the load. It is as simple as multiplication.
Generally, you won’t have any technical problems integrating. However, the building codes of these two systems might have an issue.
It concerns how much you feed into the breaker panel. That’s the reason you should always consult a professional to set up the entire system.
Here are the general steps for integrating two grid-tie inverters:
- Determine the power capacity and voltage rating of the inverters: It is important to make sure that the inverters are compatible in terms of their power capacity and voltage rating. This will ensure that they can work together effectively to power the load.
- Connect the inverters to the grid: The inverters must be connected to the grid in order to function properly. You have to connect them to the grid’s AC output and ground them according to the manufacturer’s instructions.
- Connect the inverters to the load: The inverters must be connected to the load in order to provide power. Then appropriate cables and connectors are to connect the inverters’ AC output to the load.
- Configure the inverters: Depending on the specific model of the inverters, you may need to configure them in order to optimize their performance. It means to set the inverters’ output voltage, frequency, or other parameters according to the manufacturer’s instructions.
Understanding grid-tie inverters and its integration
If you want to sync two grid-tie inverters, it’s a smart decision. However, you need to put in enough power to keep up the voltage.
Solar panels are typically aimed in different directions, isn’t it? It helps them to acquire more light and generate more power.
Now, these panels should be on their own MPPT input.
Now the trick is to place your panels in a multi-faced direction. Hence, the east-facing panel would generate power in the morning.
Similarly, the south-facing panel would start the add-in. Therefore, all the mechanism ensures to increase in the power peak.
A separate MPPT on each string would generate a bit more power for sure.
This way, you can save money from installing an additional inverter. On top of that, the engineer’s charges would also help you have a pretty penny.
However, from my experience, I found the grid-tie system is extremely efficient and reliable. Of course, if you are more concerned about the quality of power!
While solar inputs are a more economical option, they can’t compete with the unmatchable performance of the grid-tie inverter.
Interestingly, I had one set to charge the battery from the grid. And the second is a generator backup.
I use the second set if the first one runs off battery. Hence, I use both grid-tie and battery storage capabilities.
How is the system of grid-tied inverter wired?
The integration of the system entirely depends on the type of inverter. The configuration process uses three-layered wireframe. In addition, it also parallels connected with the three-phase system. The system deals with four significant mechanisms:
- Grid-tie series
The master inverter is set to 3ph. When I installed the system, the engineer suggested me a smart technique. While processing the configuration, I used two hot legs and a neutral port to attach the three-layered wireframe.
If the power load is moderate or light, the power save level allows the inverters to go off sleep. A manual master button is integrated to monitor the automated system.
Once the load goes high, the master inverter will enable the power level at 12aac.
Furthermore, the power level would go up from 12aac to 24aac. When the power level is around 4aac, the inverter goes off through automated technology.
Facts to know before installing the second grid inverter
- If the grid is down and connected, it is unlikely to generate the required power. On the other hand, if the grid is connected, it should go down and act accordingly.
- If they don’t have enough load and the grid is disconnected it would be reluctant to accept the current.
- It is ideal to discuss the intended design with a system engineer to avoid any difficulties. Also, it might require some additional equipment and interface.
- Off-grid is a separate mechanism with multiple functions. At the same time, grid access enables a reliable source of power generation that is an economically viable choice.
I have used this integrated system uninterruptedly. Moreover, the system gracefully maintained a surplus maintenance process (periodic refresh, pole transformer, power outages, etc.).
To Wrap Up
Finally, I can definitely suggest you guys use two grid-tie inverters. Moreover, you are concerned about the high-efficiency power and voltage; it’s a smart and reliable choice. Theoretically, they try to assist each other within the stipulated limit of available power.
In addition, if the system is unable to find the right balance of power, they both (or anyone) would shut down. In that case, they would use their ‘fail-safe’ technology.
Is it possible to use the same inverter for grid-connected and standalone operations?
Yes, it is possible to use the same inverter for both grid-connected and standalone operations. An inverter is a device that converts DC power from a battery or other source into AC power. Some inverters are designed to be used in both grid-connected and standalone configurations, while others may be limited to one or the other.
Can grid-tie inverter be used off-grid?
It is possible to use a grid-tie inverter off-grid, but it may require additional hardware and configuration. A grid-tie inverter is designed to be connected to the main power grid and is not typically equipped to operate in an off-grid configuration. To use a grid-tie inverter off-grid, you may need to add a battery or other power source and configure the inverter accordingly.
Do grid tie inverters really work?
Yes, grid-tie inverters are designed to operate in a grid-connected mode, converting direct current (DC) electricity from a renewable energy source, such as solar panels or a wind turbine, into alternating current (AC) power that can be utilized to power appliances and gadgets. The inverter is connected to the main power grid in this configuration and can sell excess electricity back to the grid. Grid-tie inverters are often very efficient and dependable, and they are an essential component of many renewable energy systems.
Eng. Matthew Joseph Nandirio is the Founder of walkingsolar.
After graduating from the University of Houston in 2002, matt started working as an electrical and electronic engineer for several multi-national solar energy companies.
He has a wide range of experiences including solar system requirement analysis, planning, maintaining, debugging and even solar device development through research.
He now shares his 20 years of expertise through his articles on the walkingsolar website.
Further, he is also the author of two books on Solar Technology, “Solar Power for Villages” and “DIY Solar System for Dummies”.