Troubleshooting series: Steadily declining system yield over the years is to be expected due to module degradation in photovoltaic systems. But in the following case, the yield abruptly dropped - and it happened after several years of operation. In this series based on real cases, pv magazine aims to make assessment of troubleshooting efforts more concrete and stimulate a discussion about troubleshooting efficiency today.In this case, the yield abruptly dropped - and it happened after several years of operation. For the O&M service provider Ensibo, the search for clues was a challenge:
The system: A roof-mounted system on a logistics warehouse with a rated output of just under one megawatt. The crystalline modules are mounted at 22 degrees and oriented to the south. The plant was built in 2011 in North Rhine-Westphalia. The O&M service provider Ensibo assumed operational management of the facility in the summer of 2016.
The monitoring system reports: The monthly report shows a performance ratio of 75 percent for September. Up to now, the performance ratio has ranged from 80 to 83 percent in the sunny half of the year.
Suspicion: In September there were several failures of the measurements in the generator junction boxes. For this reason, the initial assumption is that the monitoring system data is incomplete.
pv magazine webinar
New monitoring options promise greater control at lower costs
Monday, 20. November 2017
5pm - 6pm CET
How much effort is wasted for troubleshooting?
Are conventional monitoring methods for solar plants actually substandard? Or do solutions providers simply make such claims as a marketing tactic?
In pv magazine's upcoming webinar, you will have the chance to form your own opinion. Analyst Götz Fischbeck has investigated the pros and cons
of the main options that are currently available, particularly SunSniffer's module-level monitoring system. Ingmar Kruse, CEO of SunSniffer and a sponsor of this webinar, maintains that for an additional investment of just $0.02/Wp, investors can reduce their O&M costs by 20%. This could radically change current O&M prac- tices, as site engineers would no longer have to waste their time looking for degraded modules, connectors, or other defects. Instead, they could use a mobile app to precisely identify modules that are ...Den vollständigen Artikel lesen ...