What are alternative names for a transformerless inverter?

A transformerless inverter is often referred to as an ungrounded inverter. This terminology stems from the inverter's design, which eliminates the need for a transformer that typically provides electrical isolation and allows for grounding of the system. Instead, transformerless inverters directly convert the direct current (DC) from solar panels into alternating current (AC) without this isolation, leading to increased efficiency and reduced size and weight.

In this case, the term “ungrounded” emphasizes how, unlike traditional inverters that may use a grounded transformer, these inverters operate without that isolation feature. This design can allow for a more compact system and can improve energy yield in certain conditions, making it a popular choice for residential and commercial solar applications.

Understanding that transformerless inverters are essentially ungrounded helps users and technicians recognize their operation principles, benefits, and potential risks, especially concerning safety and performance in solar energy systems.