SolaRay 2 is a forced-circulation, closed-loop system, designed primarily for climates that experience annual and persistent hard-freeze conditions. The specified heat transfer fluid is an industrial grade propylene glycol. The Solaray 2 System solar storage tank incorporates an integral single-wall heat exchanger for maximum heat transfer effectiveness . The versatile SolaRay 2 solar storage tank meets or exceeds all major U.S. building and plumbing code requirements. The SolaRay 2 system is available with either AC or PV pumping options. If properly installed and maintained the Solaray 2 forced-circulation glycol system can safely be deployed in areas that experience annual persistent hard freeze conditions. SRCC Rated Freeze Tolerance: – 60° F.
The Solar Rating & Certification Corporation OG-300 systems level rating is an independent assessment of both system reliability and performance. Systems that receive this rating must meet HUD minimum property standards in addition to a rigorous review performed by SRCC staff and design review team. Once the system has passed these quality assurance checks it undergoes a full performance analysis to estimate the actual solar contribution of the system towards an average hot water load. This contribution, as defined by the Solar Energy Factor is listed alongside the different variants of each system type.