Hello Marco.
No d'oh!
Your assessment is correct; you can't store kilowatts of power, you
*can* store kilowatt hours of energy.
Author Lyn Corum might have slipped up a couple times in there and
dropped an 'h' from the kw, but maybe not -- because when storing energy
on a utility scale, the engineers are greatly concerned with how fast
the energy can come in, and how fast they can send it out. So when they
refer to a '50 kw flywheel storage unit,' that often means the max power
coming in or out at any given instant.
In our (comparatively) puny end of the energy storage business,
batteries, we rarely have to deal with the issue. Assuming our battery
bank is big enough to keep the charge or discharge rate below C10, or
even C1, we just stack more inverters.
DAN FINK
Marco Mangelsdorf wrote:
I’m reading a piece on energy storage in the latest issue of Distributed
Energy mag.
The writer, Lyn Corum, repeatedly refers to the capacity of storage
mediums (thermal, compressed air, flywheel, battery) in kW and MW terms.
Heck, even my friends at Beacon Power refer to their flywheel systems in
MW terms.
Am I missing something here? Shouldn’t all references to energy storage
be in kWh and MWh terms?
Or am I experiencing a d’oh! moment?
Marco
ProVision Solar
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