Texas internet connectivity declining due to blackouts

Mark Tinka mark at tinka.africa
Wed Feb 17 18:40:09 UTC 2021


On 2/17/21 20:04, Lady Benjamin PD Cannon wrote:

> Other than financials limiting capacity, modern residential solar 
> systems do not care a wink about what sort of load their DC is 
> driving.  The inverters also are rated for continuous duty.

Solar can drive any load. But to support heavy loads + regular ones, 
you'd need a big array and a decent-sized inverter. Double or triple the 
array if you need to support the same demand during low irradiation days 
(rain, winter, e.t.c.).


>
> If you produce more power per day than you consume, you will be fine 
> forever, simply needing enough capacity to ride out volatility in 
> production.

Most grid-tied solar installations will produce more power than they 
need, at some point. But that does not help if there is no storage 
and/or the grid fails.


>
> Let me be clear: Solar systems are suitable for every type of electric 
> load, but, if anything, */especially/* resistive loads, as those are 
> driven most efficiently by the inverters, as opposed to inductive or 
> other reactive loads.

I didn't say solar wasn't suitable for resistive loads. I said batteries 
aren't... not from a lack of ability, but a lack of capacity given the 
amount of energy that is required to drive resisitive loads over a given 
period of time (think, heating bathing water in a 200-litre water tank, 
with a 4kW element, in the dead of winter).


>
> If everyone had a large enough solar system at home, let’s say 
> covering their entire roof - we wouldn’t need generation at all except 
> for certain industrial purposes. (which can be nuclear)   The grid 
> could be shrunk dramatically as it would be a rarely used inter-tie.

Let's be clear, solar does not automatically infer batteries also.

When I say solar, I mean PV only. When I say solar + batteries, I mean 
PV + storage.

Much of user demand occurs in the evening, when the sunlight is at its 
lowest. No amount of solar on the roof will offer you power then, and if 
the grid is massively shrunk, where will your power come from? Fine, 
you've got a battery - how big does it have to be to support you 
throughout the night until the sun comes out the following morning, 
assuming it doesn't storm?

Mark.
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