The first beta installs were in 2013, followed by about a dozen SP1. models in 2014. In 2017 the SP3.1 is our 3rd.-generation with a combined total over 600 panels and 100 systems made. The installs range widely across North America from the Pacific to the Atlantic coasts, and from the North West Territories Arctic to the Bahama Island in the Caribbean. 2018 will be the 5th-year for SunPump in the field, with more testing planned in California and Massachusetts focused on Energy Efficiency and Cold Climate ratings. You can read more about some of the homes that have chosen SunPump here.