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  Cascade SRCC OG-300 System Ratings
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.

To convert the Solar Energy Factor (SEF) to a Solar Fraction, use the following formula:

Solar Fraction (SF) = 1 - (EF/SEF)

where EF is the efficiency of the backup water tank.  The EF for a standard electric backup water heater is 0.9, and the EF for a standard gas backup water heater is 0.6.

See below for an explanation of System Model Numbers.

Painted Absorbers Chrome Absorbers
 Painted Absorbers
System Model Collector Model Panel Area
(sq. ft.)		 Ruud/Rheem Heat Exchange Tank (gal) Auxiliary Tank Type SEF
EPRD-40-80 one EP-40 40.81 80 none 1.5
EPRD-40-80-2 one EP-40 40.81 80 electric 1.3
EPRD-40-80-2G one EP-40 40.81 80 gas 0.9
EPRD-42-80 two EP-21 42.42 80 none 1.5
EPRD-42-80-2 two EP-21 42.42 80 electric 1.3
EPRD-42-80-2G two EP-21 42.42 80 gas 0.8
EPRD-48-80 two EP-24 49.22 80 none 1.6
EPRD-48-80-2 two EP-24 49.22 80 electric 1.4
EPRD-48-80-2G two EP-24 49.22 80 gas 0.9
EPRD-64-80 two EP-32 65.58 80 none 2.1
EPRD-64-80-2 two EP-32 65.58 80 electric 1.7
EPRD-64-80-2G two EP-32 65.58 80 gas 1.1
 Chrome Absorbers
System Model Collector Model Panel Area
(sq. ft.)		 Ruud/Rheem Heat Exchange Tank (gal) Auxiliary Tank Type SEF
ECRD-40-80 one EC-40 40.81 80 none 1.5
ECRD-40-80-2 one EC-40 40.81 80 electric 1.4
ECRD-40-80-2G one EC-40 40.81 80 gas 0.9
ECRD-42-80 two EC-21 42.42 80 none 1.5
ECRD-42-80-2 two EC-21 42.42 80 electric 1.4
ECRD-42-80-2G two EC-21 42.42 80 gas 0.9
ECRD-48-80 two EC-24 49.22 80 none 1.7
ECRD-48-80-2 two EC-24 49.22 80 electric 1.5
ECRD-48-80-2G two EC-24 49.22 80 gas 0.9
ECRD-64-80 two EC-32 65.58 80 none 2.1
ECRD-64-80-2 two EC-32 65.58 80 electric 1.7
ECRD-64-80-2G two EC-32 65.58 80 gas 1.1

Explanation of system model numbers:

The system model number is based on the square feet of collector, absorber coating, tank size, and the backup tank. 

 

For example, the EPRD48-80 includes two each EP-24 3' X 8' Collectors (48 ft2) with Moderately Selective Painted Absorber Coating, one 80-gallon Ruud/Rheem Heat Exchange Tank, and a Drainback Tank.

 

Model number ending in -2: Two tank system with back-up electric storage water heater

Model number ending in -2G: Two tank system with back-up gas water heater