Photovoltaic
Positing this only for fun.
Installed Nov 2019, ca 9.5kWp, 29 modules (15 East + 14 West), 40deg vertical angle, Hamburg Germany. Cost at the time ca 13keur (less when accounting the 19% VAT I recovered). Feed-in-tarif ca 10ct/kWh
The inverter logs data every 5min. Unfortunately I messed with the computer, so I have fine data only the last months, before that only daily data.
Playing with data is huge fun.
I did consider getting a domestic battery. Long story short: 1) financially it would pay off (after 20yr of uninterrupted functioning) if the price was ONE TENTH of the 10keur 10kWh I got, and 2) enviromentally I see harm for no benefit
Anyone interested just ask
Comments
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Sorry to be dim - is this correct?
financially it would pay off (after 20yr of uninterrupted functioning) if the price was ONE TENTH of the 10keur 10kWh I got0 -
Looking at your data is this something you would do again based purely on the financial aspect?
Sometimes. Maybe. Possibly.
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Yes, it's correct.
Edit: I got quotation for battery, but never bought one.
The assumptions in my maths:
*) same electricity behaviour by my household, don't really see how)why this should change
*) 3% electricity inflation
*) battery to last 20yr as the vendor says, not 10yr as the manufacturer warrants
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Good question.
The pure financial aspect: at the end of their 20yr lifetime I should have recovered the initial cost, PLUS an amount equivalent to 2% / yr.
If you stay 20yr in the stock market you get much better return. Therefore no, purely financially I would not do it.
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Hang on though, your data is for the $h1t months Nov-Apr, daylight hours and winter weather. Wait till the summer when you're pumping those electrons back into the grid at a profit.
I remember as a kid going on holiday to the Mediterranean seeing solar heating panels on roofs decades ago.
It is incredible no moving parts and all that energy goodness, lush!
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Well spot.
I have data on a daily basis since the Nov 2019 installation. Based on this data, I concluded by the end of their lifetime I will have recovered initial cost, plus 2% pa.
Unfortunately the data on 5min intervals I have them only since Nov 2023, because of IT issue. These are the data on the figures I showed.
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