Re: Grand Apagon - Electricity (not) in Spain

On 1/05/2025 4:51 am, john larkin wrote:

On Wed, 30 Apr 2025 11:41:19 +0100, Jeff Layman <Jeff@invalid.invalid>
wrote:
 

On 30/04/2025 08:05, Bill Sloman wrote:
>

About 40% of new roof-top solar power installations in Australia include
a Tesla Powerwall (or something similar) to keep the lights on at night.
>
It adds appreciably to the capital cost, but pays for itself in a couple
of years. Australia's feed-in tariffs aren't generous.

>
Over here in the UK a 13.5kWh Tesla 3 powerwall will cost around £10k
(includes installation). This (USA) site suggests a payback time of 14
years
<https://www.solarreviews.com/blog/is-the-tesla-powerwall-the-best-solar-battery-available#is-the-tesla-powerwall-worth-the-price?>.
>
This Australian site
<https://cleannrg.com.au/the-real-cost-of-teslas-powerwall-battery-storage/>
seems to suggest that a powerwall save A$3000 a year, but the initial
cost is A$20000. Doesn't that make the payback time 6 - 7 years rather
than just a couple?

 Seems to me that utilities can store energy more efficiently than
individuals can in their garage.
 Same for solar panels.

Twaddle. The whole point about solar panel and lithium batteries is that they are modular. Aggregating a lot of them in one spot doesn't make them any more or less "efficient".
--
Bill Sloman, Sydney