Unisolar approves transformerless inverters from Sputnik Engineering for its thin-film modules


has officially approved transformerless inverters from Sputnik
Engineering for use with its products. With immediate effect, all
amorphous thin-film modules from Unisolar – both branded and OEM
products – can be combined with SolarMax products from Swiss inverter
manufacturer Sputnik Engineering without further approval procedures.

The question of whether transformerless inverters are suitable for combination with thin-film modules has long been the subject of discussion. In addition, solar modules made from amorphous silicon tend to degrade over the first few months, with output and voltage initially increasing. The system must be designed in such a way as to ensure that the increased initial voltage does not damage the inverter.

Sputnik Engineering AG has been able to evaluate the effect of this voltage increase using its MaxDesign system visualisation software. The software offers the option of calculating limit values with stabilised end values or initial voltages.

“Transformerless inverters from Sputnik Engineering AG have been operating successfully with Unisolar’s amorphous silicon modules since 2005,” reports Stefan Burri, Sputnik’s Head of Technical Sales Support. However, installers have until now had to combine the products at their own risk as Unisolar had not officially approved this practice. “Their official approval offers clarity and safety,” adds Burri. Galvanically-separated central inverters from Sputnik Engineering AG have been approved for use with Unisolar modules for several years.

This article requires Premium SubscriptionBasic (FREE) Subscription

Unlock unlimited access for 12 whole months of distinctive global analysis

Photovoltaics International is now included.

  • Regular insight and analysis of the industry’s biggest developments
  • In-depth interviews with the industry’s leading figures
  • Unlimited digital access to the PV Tech Power journal catalogue
  • Unlimited digital access to the Photovoltaics International journal catalogue
  • Access to more than 1,000 technical papers
  • Discounts on Solar Media’s portfolio of events, in-person and virtual

Or continue reading this article for free

Sputnik Engineering AG focuses on the development, sales and maintenance of inverters for grid-connected PV systems.

Read Next

Subscribe to Newsletter

Upcoming Events

Solar Media Events
February 28, 2024
Seattle, USA
Solar Media Events, Industry Events
March 12, 2024
Frankfurt, Germany
Upcoming Webinars
March 13, 2024
9am EDT / 1pm GMT / 2pm CET
Solar Media Events
March 19, 2024
Texas, USA