Conext SW4048 4,000W 48V Installation

Introduction
1–6 975-0638-01-03
Scenario 2
Load Shave Amps = 5A,
L1 = 7A of AC load,
L2 = 9A of AC load
In this scenario, the Conext SW enters into the AC load shaving mode because
both phase currents exceed the value of Load Shave Amps.
(L1 =7A) > (Load Shave Amps = 5A)
The difference between these two values is 2A.
Conext SW will shave off 2A from each phase, meaning, the current draw from L1
will be limited to 5A and L2 limited to 7A.
However, when the battery is in charge mode, the total AC input current is limited
by 80% of Load Shave Amps to avoid the fluctuation between battery charge and
discharge.
This fluctuation is described as follows:
• If the AC input current limit is the same value as Load Shave Amps in battery
charge mode, the charge current can be higher than the limit value due to
the charge dynamics. Under this condition, the battery will enter into
discharge mode because the AC current is higher than Load Shave Amps.
After the battery is in discharge mode, the battery will go back into charge
mode again because the load current is smaller than Load Shave Amps.
• Therefore, the battery will fluctuate between the charge and discharge
modes. In order to avoid this fluctuation, a hysteresis band is set by limiting
the AC input current to 80% of Load Shave Amps when the battery is in the
charge mode.
In a grid-interactive backup system Load shaving combined with time-of-use
metering helps reduce utility peak demand surcharges.
In an off-grid system with generator Load shaving can be used to support the
generator. If the generator is unable to provide enough current to run loads in the
system, load shaving ensures that the system does not exceed the generator’s
current rating. This is done by matching the generator’s manufacturer
recommended current rating with the Load Shave Amps setting.
See “Load Shaving Setting” on page 4–29 for a sample scenario.