3 ms·
This is the Australia energy market price and demand dashboard[1]. Note the two peaks: 1 happens at 7am. There's very little solar at 7am even though the sun i
by XorNot 3y ago
This is the Australia energy market price and demand dashboard[1].
Note the two peaks: 1 happens at 7am. There's very little solar at 7am even though the sun is up, but demand is at a maximum. The other happens at around 6pm - when people get home. There's also very little solar at 6pm (sun sets at 5pm in Winter, during the day it's longer).
Also note the demand fall off in the evening: that's a very lopsided peak, because people stay at home (whereas in the morning they turn on the kettle, then leave). But also note the absolute magnitudes: at the minimum, which is about 4am, demand last night bottomed at about 6,800MW. The peak was 9,800MW. So even the "low demand" was 2/3rds of peak demand, and it took 8 hours to get there. Most of the night, consumption was a lot higher.
But it gets worse: before you're going to recover any real capacity from your solar, the largest demand of the day is about to happen in 3 hours, with the sun just barely over the horizon.
[1] https://aemo.com.au/en/energy-systems/electricity/national-electricity-market-nem/data-nem/data-dashboard-nem https://aemo.com.au/en/energy-systems/electricity/national-e...
- Retric 3y agoThe better you model this the better the number look. First demand falls off a cliff from midnight to 5 am, a steady state nighttime rate will be extremely wasteful but batteries can shift demand to these peaks just fine. Remember 100% of their output is offsetting battery demand which is significant even just at 9AM or 6PM. Also, your not actually getting 100% solar output over the day. Batteries that could store 50% of your hypothetical maximum are well over half of your expected average output especially in winter when these peaks are most pronounced.