The PID effect occurs most commonly in crystalline photovoltaic modules and can lead to output losses, and therefore also yield losses, of up to 90 percent. This strategic partnership offers plant operators all the necessary services, from PID detection to regeneration of entire photovoltaic installations, from a single source.
One stop shop solution
Mischa Paterna is Managing Director of SUNCYCLE. He says, “Our cooperation benefits operators who suspect that their installations are affected by PID by offering them a one-stop-shop solution. To start with, SUNCYCLE performs a precise analysis of the installation. With our mobile measurement system, the modules do not even need to be dismounted, and measurements can also be taken during the day.”
SUNCYCLE has extensive experience in PID, boasting over 50 MW of regenerated PV capacity. A cost-efficient electroluminescence test can be performed on site using the portable Compact Test Unit (CTU Flex EL). If the measurement confirms the suspicion of PID, PADCON Float Controllers are installed to regenerate the modules affected.
Offset boxes connected parallel to the installation
They are anti-PID boxes, also known as offset boxes, which are connected in parallel to the installation near the inverter. Whilst the inverter is inactive, these “PID killers” raise the PV field to a high voltage, which regenerates the degraded module.
This way, even seriously degraded modules often reach 90 percent of the original output again after 4 or 5 weeks. As the companies have learnt through their customer projects, recognizing the PID effect as early as possible is paramount, not only to avoid yield losses, but also to maximize the probability of being able to fully repair the affected modules.
Long experience in the fields
According to their experience, a module whose output has fallen to 30 per cent of the original output level, can no longer be fully regenerated. “We have been working on PID prevention and regeneration since 2011, and draw on experience from over 1,000 installed devices in 20 countries around the world”, says PADCON Managing Director, Constantin Wenzlik. “Our Float Controller product family includes solutions for all power ratings and installation sizes with string or central inverters.” PADCON and SUNCYCLE offer their joint services throughout Europe. Enquiries regarding their product range can be directed to both companies. (HS)
