Why are transformerless inverters not a viable option?

Thin-film silicon (a-Si): Cells based on amorphous silicon have a tendency towards corrosion of the TCO, which leads to a permanent loss of output (problem no. 1). The solution is to negatively connect the generator to ground, which is why most transformerless inverters are not a viable option.

Which Inverter should I use?

In order to avoid unwanted deactivation, it is recommended to use an inverter that has no notable fluctuations of potential on the DC side (transformer device or transformerless inverter with quiet rail topology). The inverters available allow realizing any conceivable plant configurations.

Does a transformerless inverter shift to positive potential?

Thus, all modules of the PV system shift to positive potential when grounding the negative pole of the PV system, or to negative potential when grounding the positive pole. This is not always possible with transformerless inverters – at least not with the devices currently available.

Is there a right combination of PV module and inverter?

What seems like a double dilemma at first, is actually the solution. There is in fact a right inverter for every available module technology. Yet, it is not always easy to find the right combination of PV module and inverter. The modules simply have too many different characteristics. There are various sizes and power classes.

What are the different types of PV inverters?

There are various sizes and power classes. They are available with and without frames, as flexible or inflexible versions, manufactured using the crystalline or thin-film procedures and also made of various materials. Likewise, there are various models of PV inverters, employing different topologies and concepts.

What is the difference between transformerless and galvanically isolated inverters?

In terms of module compatibility, the distinction between transformerless and galvanically isolated inverters is probably the most important one. Thanks to their galvanic isolation, devices with a transformer allow grounding the PV array, a requirement for some module types.