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From: KevinJ93 <kevin_es@whitedigs.com>
Newsgroups: sci.electronics.design
Subject: Re: The Physics Behind the Spanish Blackout
Date: Fri, 13 Jun 2025 02:18:11 -0700
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On 6/13/25 12:57 AM, Don Y wrote:
> On 6/12/2025 6:28 PM, KevinJ93 wrote:
<...>
> 
>>> And, if your array is out of service (e.g., having repairs done or roof
>>> maintenance), then any savings the array might have realized quickly 
>>> evaporate.
>>
>> Yes, definitely possible - that would possibly cost $5,000 or 
>> equivalent to one year's consumption without solar.
> 
> Neighbor just had her roof replaced.  Remove the panels.  Replace the roof.
> Reinstall panels.  Wait for inspection before going back online.
> 
> I've not asked her what the change in electric costs were (she is "lucky"
> in that she could leave the house unoccupied during the day and just
> hope it doesn't get TOO hot inside for the ACbrrrr to bring it back
> to a livable temperature LONG AFTER she had returned home from work.)

I don't see why the power to the house would be affected. The Solar 
array can be completely isolated from power. In fact around here it is 
required that there be a well-marked accessible isolating switch on the 
exterior of the building accessible to emergency personnel. There is 
also a separate isolating switch for the battery system.

>>> We looked at the ToU tariff thinking we could easily shift our 
>>> consumption
>>> to leverage any rate reductions.  But, most of the cooling load 
>>> (which is most
>>> of the load!) happens during on-peak hours (3P-7P); and the rate is 
>>> ~50% higher
>>> per KWHr during those times.  Hard to imagine the cost in comfort to 
>>> appreciate
>>> any real savings!
>>
>> I run off batteries/solar during the peak time in summer.
> 
> It would be hard for us to do that for all of the time that
> refrigeration is needed.  E.g., it is now almost 1AM and it is
> still 85F outside.  It was 95 at 10PM.   And 98 at 7PM.
> 110 this weekend.

When I say "peak time" I mean the peak tariff time which you said is 3pm 
to 7pm - just four hours, during which there is probably a fair amount 
of solar as well so not completely off battery.

>