in installing a solar cell system Choosing an inverter device is one of the most important decisions because there are many types of inverters and each type has a different effect on the efficiency of power generation. Including the issue of safety as well

At present, inverters that are popular are divided into 3 types: String Inverter, Power optimizer and Micro-Inverter. So let’s see how each type of Inverter differs ?

1. String Inverter

String Inverter is an inverter connected to Solar panels are wired together in series, also known as “strings”, so that the voltage is higher than the minimum voltage required by the string inverter. will be sent to a single inverter

Advantages of String Inverters

1. Easily accessible because it is cheap
2. The inverter can be maintained easily. because it will be installed near the ground

Disadvantages of String Inverters

1. Due to high voltage making it dangerous for people working on the roof If a fire occurs (Rapid Shutdown is not supported)
2. If one solar panel fails, other panels in series will not be able to generate power. or if the panel is obscured by shadows, it will cause other panels On the same string, the efficiency is also reduced.

The String Inverter is suitable for low-cost installation. because it is cheap and easy access to maintenance But it comes with the risk of danger from high voltage.

2. Micro-Inverter

Micro-Inverter It is a small inverter that is installed under each solar panel. making these solar panels work independently
This system will convert direct current (DC) to alternating current (AC), or that is, convert solar power to home electricity from the roof immediately.

Advantage of Micro-Inverter

1. With every solar panel working independently causing if any solar panel has lower efficiency it will not affect other panels
2. There is a monitoring system that can be checked immediately. If any panel is damaged
3. When it is necessary to replace solar panels or expand the system, we can use new panels with different wattages.
4. Supports Rapid shutdown (a system that can reduce the voltage to 30 volts within 30 seconds)

Disadvantage of Micro-Inverter

1. It is the most expensive inverter.
2. Difficult to install and maintain, for example, if one inverter is broken have to go up to the roof for repair or replacement

By Micro-Inverter It is suitable for small installations or houses because the price is very expensive if it is installed in a big project. This will result in a much slower payback.

3. Power Optimizer

Power optimizer is a small inverter that is installed under the solar panel. Instead, it operates as a combination of both a string inverter and a micro-inverter. This system “optimizes” the current and voltage on the DC side before sending it to the string inverter to convert it to AC.

(While Micro-Inverter will convert DC power to AC power immediately) by 1 power optimizer will be able to connect to solar panels multiple panels

Advantage of Power optimizer

1. If there is a shadow covering the solar panel Performance will be reduced only for pairs connected with the same optimizer (in case one optimizer is connected to a small number of solar panels).
2. There is a monitoring system that can be checked immediately. If any panel is damaged
3. isoflavones Micro-Inverter and is cheaper But it has slightly lower performance.
4. Supports Rapid shutdown (a system that can reduce the voltage to 30 volts within 30 seconds)

Disadvantage of Power optimizer

1. If there is a shadow covering the solar panel The efficiency of panels connected to the same optimizer will also be lower (in case one optimizer is connected to many solar panels).
2. Same as Micro-Inverter If one inverter is broken have to go up to the roof for repair or replacement

The Power optimizer is suitable for large installations or factories because the price is not too expensive. with similar performance Micro-inverters such as support for Rapid Shutdown

It can be seen that each type of inverter is different. Both in terms of efficiency, price, and safety. If anyone is looking for an inverter, it may be considered from the information above. We recommend that houses or buildings that are shadowed. or have panels facing in different directions Micro-Inverter and Power optimizer are considered alternative solutions.