Comment on Anon questions our energy sector
iii@mander.xyz 4 weeks agoUptime is calculated by kWh, I.E How many kilowatts of power you can produce for how many hours.
That’s stored energy. For example: a 5 MWh battery can provide 5 hours of power at 1MW.
What uptime refers to is: how many hours a year, does supply match or outperform demand.
So to match a 1gw nuclear plant, you need around 12gw of of storage, and 13gw of production.
This is incorrect. Under the assumption that nuclear plants are steady state, (which they aren’t), to match a 1GW nuclear plant, you need a 1GW battery, with a capacity of 1GWh.
mosiacmango@lemm.ee 4 weeks ago
My math assumes the sun shines for 12 hours/day, so you don’t need 24 hours storage since you produce power for 12 of it.
My math is drastically off though. Assuming that 12 hours of sun, you just need 2Gw production and 12gw of battery to supply 1gw during the day of solar, and 1gw during the night of solar, to match a 1gw nuclear plants output and “storage.”
Seeing as those recent projects put that nuclear output at 17bil dollars and a 14 year build time like, and they put the solar equivalent at roughly 14billion( 2 billion for solar and 12 billion for storage) with a 2 - 6 year build timeline, nuckear cannot complete with current solar/battery tech, much less advancing solar/battery tech.
iii@mander.xyz 4 weeks ago
Again, I think you might not understand the difference between W and Wh. The SI unit for Wh is joules.
When describing a battery, you need to specify both W and Wh. It makes no sense, to build a 12GW battery, if you only ever need 1GW of output.
mosiacmango@lemm.ee 4 weeks ago
You can quibble about battery engineering or focus on your original question, which is : can solar + battery tech do what nuclear does today, but faster and cheaper?
That is a clear yes.
If you want more exact details about the batteries that array used, click on the link in my comment
iii@mander.xyz 4 weeks ago
How many days a year does that occur? How much additional storage and production do you need add, to be able to bridge dunkelflautes, as is currently happening in germany, for example (1)?
That’s why I mentioned the 90%, 99%, etc. If you want a balanced grid, you don’t need to just build for the average day (in production and consumption), you need to build for the worst case in both production and consumption.
The worst case production in case for renewables, is close to zero for days on end. Meaning you need to size storage appropriatelly.