When I show my PV system to my friends, they often ask following questions:

Q: How much did your PV system cost ?
A: The total budget is close to 14 000 €

Q: What about the ROI (Return On Investment) ?
A: It will take 20 years to amortize the installation with the current electricity price (0.12 €/Kwh). If this price rises, it will take less time...

Q: Is it an expensive engineering gadget or does it really work ?
A: it really works. From end of winter to end of autumn, the production is sufficient for our daily needs (4 people family). During summer we even have large surpluses. We use all our traditional appliances without restrictions: dishwasher, electric kitchen oven, washing machine and even the clothes dryer, sometimes 3 times a day. The only change I made was to replace traditional bulbs by LED lights. A well designed PV system produces plenty of energy and provides a high level of comfort to the inhabitants.