HEC+ (High Efficiency Cell Plus) is an industrial standard established among the manufacturers of photovoltaic modules similarly as the introduction of standard measuring conditions. HEC+ represents a specific group of photovoltaic modules demonstrating low degradation curve and long durability.
The basic requirements for the HEC+ brand:
1. Silicon purity must be over 300Ω
2. Zero tolerance of „micro-cracks“ (microscopic cracks or cell deformations)
3. Limited group of EVA with high resistance against UV
4. Limited group of tempered glasses with additives for the preservation of crystality
5. Limited group of junction boxes with increased heat resistance
6. Balanced bi-pass diodes with a minimum division to 3 sectors
7. Solar cables with specific characteristics (e.g.temperature limit -40°C +120°C)
8. Connector with specific sealing qualities.
The most important criterion that must be met in order that a given product can be labeled as HEC+ are cell degradation curves (PV Cell), glass and EVA. The sum total of the basic components degradation curves must not be n excess of 10% after 168-month exposition. These parameter are tested by artificial light.
Another important aspect is the micro-cracks and a presence/absence of PV cell defects invisible by naked eye. Several kinds of defects – (cracks, unevenness) might result in a decrease in power output in the levels A, B and C. In the level C, it could be assumed, the components will not be able to endure the guarantee period the manufacturer provides.
Before you choose a supplier to provide you with “the best panels at the lowest price”, please, make use of our EFEKTIM-SUMEC test centre and take a rather closer look at the panels yourself.
