About us


work timeline

mission

people
1983
1990
1993-95
2000
2005
2009
2010-11
2011
2012
2013
Today
1983
SIEL is born under the aegis of Enrico Pensini, SIEL’s founder and current President, with the aim of designing and producing UPS devices.
1990
The headquarters is based in Trezzano Rosa, Milan.
1993-95
SIEL develops its high-power UPS range provinding it with microprocessor control.
2000
the company enters the field of renewable energies and develops its Solar line of products i.e. inverters for photovoltaic applications and high power solutions up to 660 kWp.
2005
Siel Spa is the market leader with its three-phase inverters for photovoltaic installations.
2009
Soleil PS 1000, the new 1MW “Plug and Play” photovoltaic solution, is introduced to the market.
200MW are installed.
2010-11
Siel’s Trezzano Rosa headquarters doubles in size with the incorporation of a nearby building.
The two buildings are supplied with 2, 18 and 80 kWp photovoltaic installations, so it be able to drastically reduce the own production of CO2.
2011
Novelty also for products: Sunsiel is born, the new range of PV Solar inverters specifically conceived for the USA market.
2012
Born SIEL AMERICA, new facility in New Jersey (Parsippany), a project that involves Glauco Pensini with driving task of CEO.
2013
Founded the new Spanish company located in Valencia SIEL ENERGY. Siel meets the UL requirements to become "ETL LISTED" and get authorization to mark its products for the U.S. and Canadian market.
Today
SIEL is a group present in over 80 countries

All the products by Siel America guarantee power, safety, pleasant design, and high versatility, and its main objectives are:

  • offering the highest efficiency levels of the sector
  • supplying the grid with cleverness and safety
  • afford the user to manage the installation
  • find the solution to any installation trouble by offering varied options
  • assuring the best efficiency in every condition
Enrico Pensini
Honorary Chairman
Glauco Pensini
CEO & President
Alessandro Mori
Chief Operating Officer
Rodrigo Bertoletti
Sales Manager