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PV panels at Willems BV, Kessel, one of the largest PV solar panel arrays in the country.


to 11 %. Besides that, 25% less electricity needed to be purchased, resulting in savings of around € 0.11/ kWh generated power. This indicated a payback time of approximately seven years. As solar PV has a life expectancy of around 25 years (during which time the output degrades slightly), this was conside- red to be an acceptable payback time, and Willems decided to proceed.


Van Nieuwenhoven, Ospel The farm run by Wim and Gerry van Nieuwenhoven harvests manually and comprises 10 growing rooms of 300 m2. Two rooms are filled each week, and two flushes are produced in a five-week cropping cycle. The climate installation has individual climate units with the customary technology such as proportio- nal direct freon cooling, high efficiency boilers in a cascade system, and a steam boiler used for cook out and humidification. The farm also has the latest energy saving climate modules and participates in energy monitoring.


From torch to 115,000 kWh Wim van Nieuwenhoven met Durasolar at their stand at the Mushroom Days in 2011. He had been interes- ted in this form of power generation for years (‘since I first saw a solar powered torch’). Choosing solar PV was motivated by a desire to optimise operational aspects and save money, but in a form that respects the environment and supports sustainability. Van Nieuwenhoven compared several suppliers before deciding to award the order to Durasolar. Since January 2012, 127 kWp, or 910 m2 crystalline solar PV has been installed (455 PV panels of 2 m2 of 280 kWp). The annual generated output is approximately 110,000 kWh, the equivalent of around 44 house- holds and provides a third of the energy requirement on the company. Here too, the initial experiences indicate a higher generated power than assumed beforehand (115,000 kWh/year in 2012). The PV installation was purchased in cooperation with gro-


Inverters at Willems. They must be preven- ted from overheating, otherwise the output and life expectancy will decrease.


wers’ association Funghi, and the renewable energy subsidies and tax benefits were also utilised. A third less electricity was purchased, leading to savings of around


€ 0.11/kWh generated power. This also


gave van Nieuwenhoven a payback time of about seven years, so the decision to invest in solar PV was taken reasonably fast.


Experiences with suppliers Both men point out that suppliers of PV solar instal- lations generally know what they are talking about. What is important is to choose a supplier who can also provide a well-founded and realistic calculation that includes all the relevant aspects – such as the roof construction, the energy output of the various ty- pes of PV panels based on their solar angle, capacity of the electrical connections, savings on your own energy consumption, renewable energy subsides and tax benefits etc. Both companies ended up choosing PV panels made in China. A crucial deve- lopment that has contributed to the current payback time of around seven years is the sharp drop in the price of solar PV (over the past two years around € 2 per Wp to the current figure of around € 1 per Wp). Despite the threatened import levy on PV panels manufactured in China, any price rise is expected to be marginal or very limited. The chosen inver-


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