The next question in your series (which I am helping a German relative figure out out of intelectual curiosity) is: assuming very low or zero feed in tariff, what size battery is the best economically.
With falling battery costs (for households I bought at 280€/kWh), moving from 1 to 2 or even 4h battery systems start making sense.
Yes, that's a fun engineering project to work on. The following step could then be to include EV charging and heat pumps in the optimization. You'd need to also consider different scenarios for electricity prices, as their future trend is highly uncertain and tied to geopolitical developments
Great post!
The next question in your series (which I am helping a German relative figure out out of intelectual curiosity) is: assuming very low or zero feed in tariff, what size battery is the best economically.
With falling battery costs (for households I bought at 280€/kWh), moving from 1 to 2 or even 4h battery systems start making sense.
Yes, that's a fun engineering project to work on. The following step could then be to include EV charging and heat pumps in the optimization. You'd need to also consider different scenarios for electricity prices, as their future trend is highly uncertain and tied to geopolitical developments
Great post, thanks! You can also calculate the changes in ROI of solar, onshore wind and offshore wind as categories by looking at the market value data that the TSOs in Germany are obliged to publish: https://www.netztransparenz.de/en/Renewable-energies-and-levies/EEG/Transparency-requirements/Market-premium/Market-value-overview
The calculation method is the same that you're using. Data goes back to 2012 – things really were different back then
Thanks for sharing this interesting resource!