How to achieve load management with an ATESS EV charger?

2020.02.14

What is load management

Usually in a home or building installation, regular load appliances and EV charger together share the power limit from grid, building load equipment is first priority, so the EV charger will need to limit its loading power dynamically according to variation of building load power in such cases. It ensures load equipment operation meanwhile keep the EV charged at maximum available power.


Why do Load management

•Avoids facility disruption, which causes operating losses

•Reduces energy and electrical infrastructure costs

•Avoids tripping of main circuit breaker due to overload.

How does the load management of the ATESS EV chargerwork?

The charger can monitor the total power consumption at the grid point in the charging process through CT or meter. If the total power consumption exceeds preset maximum, the charger will reduce the charging power accordingly.


How to implement load management?

1) Hardware preparation

a CT or meter(optional from ATESS) is needed to detect the import power. If a CT is used, please wire it as below.( About the selection of CT or meter: when the charging point is single-phase, select the single-phase CT or meter, when the charging point is three-phase, select the three-phase CT or meter. if the distance between the distribution switch and the charging point is within 15 meters, select the CT , if the distance between the distribution switch and the charging point is more than 15 meters, select the meter.)

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If a meter is used, the wiring will be as the following:

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2) Parameter setting

(1) Connect the EV charger to a laptop with a network cable, access the parameter setting page on the web browser of the laptop.

(2) Scroll down to find the following parameter: Power Distribution Enable(0:Disable, 1:Enable) and set it to 1 to activate the load management function.

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(3) Select power sampling device in the field of the parameter: External Power Sampling Wiring(0: Inner CT 1: PowerMeter). 0 means CT while 1 stands for meter.

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(4) Set the maximum power import value in the field of External Maxlimit Power(kW). To avoid accidental tripping of the main breaker, it is suggested to set this parameter slightly lower than the max supply power of the property. e.g. the max supply power from grid is 15kW, you can set the max power import to 13kW or 14kW.

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