ESS Disconnects and 2017 NEC 705.22

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Ridikuluz said:
...Is an ESS generating power, or is it storing power for future use?


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An ESS does not store power. Nothing stores power. An ESS stores energy. It generates power from its stored energy, regardless of where that stored energy was originally generated.

It's a fine point perhaps, but an important one, and one that in my opinion completely refutes your suggested reasoning.
 
In my opinion, converting stored energy into electrical energy is different than generating energy. An ESS is not the generating source. But it sounds like I might be on an island with this reasoning. The definition for a microgrid system draws the same distinction.

Energy Storage System (ESS). One or more components assembled together capable of storing energy for use at a future time. ESS(s) can include but is not limited to batteries, capacitors, and kinetic energy devices (e.g., flywheels and compressed air). These systems can have ac or dc output for utilization and can include inverters and converters to change stored energy into electrical energy.

Microgrid System. A premises wiring system that has generation, energy storage, and load(s), or any combination thereof, that includes the ability to disconnect from and parallel with the primary source.
 
You seem to be confusing energy with electricity. It's simple really:

Ridikuluz said:
Power Production Equipment. The generating source, and all distribution associated with it, that generates electricity from a source other than a utility supplied service.
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During a grid outage, if the ESS is off, is there any electricity? No. If you turn it on, is there electricity? Yes. So the ESS is generating electricity.

Nothing generates energy (except mass reducing interactions like fission and fusion). "Generators" just convert energy from one form to another. It doesn't matter if the input energy is chemical energy released by combustion, wind energy, sunlight, or chemical potential in a battery, when the output energy is in the form of electricity, it's Power Production Equipment.

Cheers, Wayne
 
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