[gertlex]

Curious where you are roughly located; Does that 80% include the distribution of the electricity?

Should I interpret the 20-25% returns as being, your annual savings on the utility bill are 20-25% of the cost of your PV install?

[hectormalot]

Netherlands. No distribution fees are separate.

Roughly speaking the electricity is about €0.06 with about €0.20 in taxes on top. So offsetting consumption nets me about €0.26 cents per kWh.

The installation of a 2800kWp system cost me about €2600 and generates between 2400-2750kWh annually, so about €650 euro. In a 10 year timespan that’s an IRR of 20%, creeping up to 25% for 20 years.

[gertlex]

Thanks for the numbers! I had no idea taxes were such a large fraction elsewhere. Good to know/consider. I'm most familiar with California. (and actually can't give a % that is taxes offhand)

After the first year of having PV, I determined my own payoff time of about 5-7 years, so that was nice and self-justifying, and haven't dug deeper into details on that.

[__alexs]

Congratulations for being the only person in the thread who did an ROI calculation.

Did you DIY your install?

[hectormalot]

Partly, I did the electrical work myself (dug a cable to the shed, added a breaker, etc). Asked the installer to put the panels on the roof and connect it to the existing line. The roof is low, so access was easy and they were done in a less than 2 hours, kept the cost low.

[guerby]

2800kWp => 2800Wp :)

[hectormalot]

Oops yes, that would otherwise make for very cheap solar.