On Sun, 25 Aug 2019 08:55:48 -0700 (PDT), wrote:

Even if UPSes were 100% efficient, they would still not be practical for grid backup.

That'll be why 450 MW (ish) of battery was called upon to help keep
the grid up the other Friday. Mind you it's not been stated for how
long said "battery" could supply that power...

The costs, pollution, energy consumption in manufacture and vast demand
for lead would be problematic.

More likely to be lithium than lead. But isn't there some other weird
and wonderful battery technology about using molten sulphur or
something?

--
Cheers
Dave.