In the world of solar energy, choosing the right inverter for your solar system is a crucial decision. When installing solar systems, there are typically three types of solar inverters that can be considered: string inverters, string inverters with DC optimizers, or microinverters . Each type of inverter has its advantages and disadvantages. In this article, we will discuss the features and advantages and disadvantages of each type of inverter individually to make your choice easier.
String inverter
As the name suggests, a string inverter connects a group of solar panels to a single inverter. The inverter converts the direct current from each solar panel connected to the string. However, if part of this string is obscured by solar panels or maintenance issues arise, it can affect the performance and efficiency of all other solar panels in the string. To prevent this, many homeowners also choose to install DC optimizers in string inverters.
DC optimizers are installed separately on each module and consider the performance of each module in the string individually. This means that even if one module is covered or turned off, all other modules continue to function normally. It is recommended to use DC optimizers when parts of the solar panel are obscured or are not at the optimal angle to the sun.
It should be noted that some manufacturers require the installation of DC optimizers on their string inverters. String inverters are also usually cheaper than microinverters. However, installing DC optimizers along with a string inverter requires additional costs. DC optimizers and string inverters also typically have separate warranties.
Advantages and disadvantages:
- DC optimizers can be installed to address the individual performance and efficiency of each module without affecting the entire assembly.
- Because they are typically wall mounted rather than roof mounted, they are easier to maintain and replace.
- Typically cheaper than microinverters.
- If DC optimizers are not installed, the performance of the solar panel system is limited to the performance of the worst panel.
- If you decide to add more panels to your solar system, new inverters may need to be purchased.
Microinverter
Choosing microinverters for your solar energy system results in a completely different configuration. Microinverters are not large inverter boxes connected to multiple solar panels, but rather are mounted on each individual solar panel in the array. Because microinverters operate at the module level, they are suitable for complex solar setups, partially shaded roofs, or roofs that may not be at the optimal angle to the sun. Microinverters also allow for easier system expansion.
For example, if you initially want to install panels on half of your roof and add more panels later, microinverters make it much easier to add more panels. When you purchase a system with DC optimizers and central string inverters, the inverter is sized based on your existing system.
Because microinverters are considered rooftop devices, their warranty is typically much longer than that of string inverters. The industry standard for microinverter warranties is 25 years. However, because they are mounted on the roof, maintenance and replacement are more difficult.
Advantages and disadvantages:
- The warranty is longer than that of string inverters.
- Later additions of panels can be made more easily.
- Suitable for shady roofs or unusual angles.
- Microinverters are roof mounted, so maintenance and replacement is more difficult.
- Typically more expensive than string inverters.
Solar inverters are crucial components of a solar power generation system and play an important role in converting solar energy, improving power generation efficiency and protecting safety. With continuous technological innovations, solar inverters are being further developed and driving the sustainable development of the solar energy industry
