The Ironman for photovoltaic panels takes place every day in our own quality control laboratory. After all: We only offer the very best IBC SOLAR modules! In order to receive this distinction, the panels must pass a series of endurance tests. In the second article in the series, we will present the insulation resistance test under wet conditions.
Rain, dew, melted snow – a lot of water flows down the cells over the course of a solar panel’s service life. The measurement of resistance to moisture is therefore a central test procedure that our photovoltaic panels have to undergo. The “insulation resistance under wet conditions” is tested according to DIN EN 61215-2:2017.
The panels are immersed in a special water bath to just below the outlets for two minutes at 22 degrees Celsius and a resistance of 3,500 Ω/cm and then electricity is applied. If panels have an area of greater than 0.1 m², the measured insulation resistance multiplied by the module area must not be less than 40 MΩ x m².
It is important to measure the insulation resistance because moisture may not reach active parts of the PV module, which means that corrosion, earth leakages and safety risks can be ruled out.