I also counted the mean number of doldrum hours, days and weeks per year: 9/ - ThreadSky

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kopfgold.bsky.social • 104 days ago

I also counted the mean number of doldrum hours, days and weeks per year: 9/

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kopfgold.bsky.social•104 days ago

Now forget doldrum counting. The questions we *really* want to answer are: How much storage, how much backup power, how much energy import is necessary. Instead of using data to count DDs, why not address these questions directly? 10/

kopfgold.bsky.social•104 days ago

To determine storage size we must first define the length of a buffer period in which we aim to be independent from imports (if applicable) and then calculate the energy deficit. Inspired by Ruhnau & Qvist I have done this for periods of 10, 30 and 90 days. 10 days: 11/

kopfgold.bsky.social•104 days ago

30 days: 12/

kopfgold.bsky.social•104 days ago

90 days: 13/

kopfgold.bsky.social•104 days ago

Backup power is determined by the maximum positive residual load encountered after batteries and DSM. It turns out to be 171 GW: 14/

kopfgold.bsky.social•104 days ago

Imports are determined by energy deficit. In the mean it turns out to be 269 TWh/a, 22% of mean yearly electricity generation. The maximum deficit in a single year is 344 TWh: 15/

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