EnerSys OutBack Power SkyBox, Руководство пользователя

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900-00272-01-001 Rev A
25
If you’ve read
The Power Grid and You
on page 6, you would know that normally, when SkyBox is set to
the
Self-consumption
profile, the battery will reach
Minimum SOC
and stop providing power to the loads until
it is fully charged at
Maximum SOC
. This is not the case with the profile
Net metering with backup
and the
TOU function. Figure 19 shows an illustration of this concept.
Self-consumption
is represented by the red
time blocks.
In the scenario below, the battery is discharged during the 06:00 – 09:00 timeframe and reaches
Minimum
SOC
before the rate change. All loads in excess of the solar power produced are carried by the grid. The
battery remains at rest until the rate changes, then it begins charging using grid power at the
Grid Charge
Limit
. The battery remains below the
Maximum SOC
during the 09:00 – 15:00 timeframe. When the grid rate
changes again at 15:00, based on the way Self-consumption works, you would think the battery would remain
at rest until it is charged. Not so. The internal command telling the SkyBox not to discharge cleared at 09:00
when the internal profile changed to
Net metering with backup . This is visible at the end of the first red time
block in Figure 19.
If programmed correctly, the SkyBox discharges the battery during the times when utility power is more
expensive than the battery. The battery charges from solar or utility power when allowed and when the utility
power is less expensive than the battery. Once the utility power is expensive again, the battery discharges to
support the loads regardless of the state of charge and if the previous charge cycle was completed.
Figure 19 Daily schedule and visual of battery SOC
NOTE:
The SkyBox does not check your actual grid rates, your actual TOU schedule, or your LCOE.
Feel free to adjust any of these three parameters to tailor the SkyBox's energy arbitrage to your
situation and make the best use of the components you have installed.