Wekken mijn zonnepanelen meer op tijdens Coronavirus?

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Gert-Jan Onderzoekt #1

Wekken mijn zonnepanelen meer op tijdens het Coronavirus?

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Er zijn nagenoeg geen vliegtuigen in de lucht, er rijden minder auto’s en de industrie werkt op halve kracht. De lucht is al met al een stuk schoner dan voor de Corona-crisis. Al weken vraag ik mezelf af of mijn zonnepanelen ook meer opwekken. Het was best lastig om te onderzoeken maar ik heb een mogelijke verklaring gevonden!

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Om te beginnen hebben we een perfect voorjaar achter de rug. In maart heb ik 277kWh opgewekt met mijn zonnepanelen. Dat is veel hoger dan in 2018 en 2019 waarin ik respectievelijk 177 en 213kWh heb opgewekt. In april liep dit op naar 423 kWh tegenover 368 (2019) en 297 kWh (2018). En dit terwijl 2018 en 2019 voor mij al recordjaren waren qua zonopbrengst. De maand mei lijkt nu weer een recordmaand te worden. De sky is the limit. Of beter gezegd, the sky was the limit.

Ik ben van het principe “meten is weten”. Daarom ben ik in de cijfers gedoken van mijn Envoy.

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De onderzoeksopzet

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De hoge opbrengst komt uiteraard door het aantal zonuren. Toch lijkt het erop dat schone lucht invloed heeft op de hogere opbrengst. Om dit te onderzoeken heb ik gekeken naar een perfecte zonnige dag. Ik kwam uit op 20 april 2020. Het jaar hiervoor was ook een perfect zonnige dag. Hierdoor hebben we een zelfde dag op het zelfde moment in het jaar met zo goed als dezelfde condities. Dat maak dat we de resultaten met elkaar kunnen vergelijken.

In de onderstaande afbeelding is de opbrengst van 2020 zichtbaar. In de afbeelding ziet u ook de grijze lijn. Deze lijn is de opbrengst in 2019. U ziet duidelijk dat de opbrengst in 2020 over de gehele dag hoger ligt dan opbrengst in 2019. Over de gehele dag is de opbrengst 8% hoger dan het jaar ervoor.

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Verandering in zonneactiviteit of vieze panelen?

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Hoe verklaar je zo een groot verschil terwijl de omstandigheden nagenoeg hetzelfde zijn? Een factor die mee zou kunnen wegen is de activiteit van de zon en de UV-kracht. Een zonnevlam zou hier een schommeling in kunnen veroorzaken. Nu ben ik een beetje een nerd, maar dat gaat me een beetje te ver om uit te zoeken. Daarnaast zou een zonnevlam nooit een opbrengstverhoging van 8% kunnen verklaren.

Een andere variabele zou een verschil in viezigheid op de zonnepanelen kunnen zijn. Om de invloed van vuiligheid te kunnen inschatten ben ik in het archief van neerslagkaart.nl gedoken. Ik heb gekeken naar de week voorafgaand aan 20 april in 2019 en 2020. In 2019 was het de hele week droog, behalve op 14 april. Toen heeft het 1-2mm geregend. In 2020 heeft het op 19 april 1mm geregend in Ede. In beide gevallen kan vastgesteld worden dat er geen significant verschil zou moeten zijn in de zonnepanelen dat een opbrengstverschil van 8% zou kunnen verklaren.

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Temperatuur

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De temperatuur van zonnepanelen hebben invloed op de opbrengst. Dit voorjaar is het relatief koud geweest. Dat is ideaal voor zonnepanelen. Hoe warmer het paneel, hoe lager de opbrengst. Dit heeft te maken met geleiding van stroom door het paneel. In 2019 was de eerste zomerse dag op 19 april. Help! Dat is een dag voor onze testdag. De temperatuur was in 2019 max 22, min 6 graden. In 2020 was dit max 17, min 4 graden. Het was in 2019 dus wel een stukje warmer.

Het verschil in opbrengst is dus mogelijk te verklaren door een warmteverschil. Om hier zeker van te zijn heb ik ook gekeken naar een andere dag. Op 21 april 2019 was de temperatuur max 19, min 1 graden. Een jaar later was het max 18, min 6 graden. In de grafiek zien we dat de opbrengsten vrijwel gelijk zijn aan de opbrengsten van 20 april. Kortom, de resultaten blijven overeind. Met daarbij nog een andere conclusie: de temperatuur is geen verklaring voor het verschil in opbrengst. Sterker nog, temperatuur lijkt in dit deel van het jaar nog amper een negatief effect te hebben op de opbrengst.

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Conclusie

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Met dit onderzoek heb ik kunnen vaststellen dat ik op de testdag 8% meer heb opgewekt dan het jaar ervoor. Ik heb vastgesteld dat de zonnepanelen in beide jaren ongeveer even vuil moeten zijn geweest. Ook heb ik vast kunnen stellen dat het effect van de temperatuur op de opbrengst nog niet zo groot is bij de temperaturen op de testdag. De omstandigheden zijn nagenoeg gelijk. Toch zien we dat de zonnepanelen op de testdag in 2020 8% meer hebben opgebracht.

Echt wetenschappelijk bewijs kan ik niet leveren leveren, maar het is aannemelijk dat het verschil kan komen door de gevolgen van het Corona-virus. Door Covid-19 draait de industrie op een lagere capaciteit waardoor zij minder smog uitstoten. Hierdoor is de lucht schoner. Daarnaast vliegen er veel minder vliegtuigen waardoor er minder witte strepen in de lucht hangen. Smog en witte strepen zorgen voor diffuus licht op de zonnepanelen met als gevolg een lagere opbrengst.

Uiteraard zijn we ons er van bewust dat dit positieve effect in geen mogelijkheid opweegt tegen al het leed en verdriet dat Covid-19 heeft veroorzaakt. Onze gedachten gaan dan ook uit naar mensen die hier op een of andere wijze mee in aanraking zijn gekomen.

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