Solar Builder

JAN-FEB 2019

Solar Builder focuses on the installation/construction of solar PV systems. We cover the latest PV technology (modules, mounting, inverters, storage, BOS) and equip installers/contractors with tips and tools to make informed purchasing decisions.

Issue link: http://digital.solarbuildermag.com/i/1072350

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SOLARBUILDERMAG.COM | 45 Panasonic The Panasonic N340 HIT + Series with its heterojunction technology and enhanced 40-mm frame offers customers increased module efficiency, performance and longevity while maximizing available roof space. The new 40-mm frame increases durability and strength, being able to handle loads of up to 5,400 Pa. Also, the water drainage system gives rain water and snow melt a place to go, reducing water stains and soiling. Warranty: 25-year workmanship and linear power output. Rated power 340 W Cell type silicon heterojunction Cell efficiency 22.85% Module efficiency 20.3% Short-circuit current 6.13 A Open circuit voltage 71.3 V Rated current 5.70 A Rated voltage 59.7 V Temperature coefficient (Pmax) -0.26% Quantity per pallet 24 Lifetime value 4 Efficiency numbers in lab conditions and coming out of the box get the biggest headlines, but for an investment that degrades over its 25-year lifetime, it's not the most impactful metric on its own. Other module lifetime considerations such as warranty terms, temperature coefficients and degradation rates are now winning the day in many segments but especially in res- idential. EPCs and installers that only look at one facet, such as price or rated DC capacity, are doing themselves and their customers a disservice. While those factors are important, selling certainty over 25 years is more valuable overall. "Often we hear from our customers that they made the mistake of only looking at the price per watt when choosing a PV module," notes the team at Trina Solar. "Then they found that they had increased operations and maintenance costs down the road, and that the company they had bought from is no longer around to honor the warranty. Unit cost is important to consider, but if you neglect to look at things like performance, quality standards and company bankability, you may end up paying for it later."

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