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From: Bill Sloman <bill.sloman@ieee.org>
Newsgroups: sci.electronics.design
Subject: Re: Grand Apagon - Electricity (not) in Spain
Date: Thu, 1 May 2025 15:33:48 +1000
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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