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From: john larkin <jl@glen--canyon.com>
Newsgroups: sci.electronics.design
Subject: Re: Grand Apagon - Electricity (not) in Spain
Date: Fri, 02 May 2025 07:45:34 -0700
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On Thu, 1 May 2025 11:37:46 -0700, KevinJ93 <kevin_es@whitedigs.com>
wrote:

>On 5/1/25 4:06 AM, Jeroen Belleman wrote:
>> On 5/1/25 12:24, Liz Tuddenham wrote:
>>> Chris Jones <lugnut808@spam.yahoo.com> wrote:
>>>
>>>
>>>> There is nothing magic about the current from a rotating generator that
>>>> cannot be exactly replicated by an inverter ...
>>>
>>> Inertia.  Not magic but physics.   A store of energy that can be drawn
>>> on instantly for several seconds.  Only an inverter with a massive
>>> energy storage system could match that; domestic systems can't.
>>>
>>>
>> 
>> I'm convinced it's becoming necessary for small domestic systems
>> to servo the injected power to the grid frequency, just as is done
>> for large power plants. There is no need for massive storage; Each
>> contributes what he is able to. I *do* think the dP/dF will need to
>> be adjusted by some central authority to keep a stable system.
>> 
>> Jeroen Belleman
>
>In California and many other states it is required that residential 
>solar inverters adhere to Rule 21 (aka UL 1741).
>
>They have some simple rules that are intended to stabilize the grid 
>where there are significant amounts of solar power.
>
>Below 60Hz and 245V the inverters are not restricted but as the 
>frequency or voltage rises above the thresholds the inverters will 
>curtail their output.
>
>As there is no energy storage in the inverters it is not possible to go 
>further and take power from the grid.

Just pump it back into the solar cells. Return it to the sun.