diff --git a/Solar.md b/Solar.md
index b211a5b..b4d9c94 100644
--- a/Solar.md
+++ b/Solar.md
@@ -2,7 +2,7 @@
 -   FAQ, Begriffe - <https://www.zolar.de/photovoltaik-lexikon>
 -   DIY, Fotos -
     <http://home.eversberg.eu/medialog/index.php?path=projects%2Fsolar&limit=100>
-
+- https://pvtools.sektorsonne.de/ -> Amortisation rechnen
 
 -   Standortdaten -
     <https://joint-research-centre.ec.europa.eu/pvgis-photovoltaic-geographical-information-system/pvgis-releases/pvgis-52_en>