Electronics > Projects, Designs, and Technical Stuff
EV Charging - Is it realistic to simulate a battery?
741:
The diagram A.8 is in a standard called 61851-1. You might be right about the purpose of the variable load, makes sense to me anyway.
mikeselectricstuff:
--- Quote from: 741 on September 26, 2019, 04:06:01 pm ---The EV unit allows mains power (or not), via a relay - taking into account how many amps the EV unit states it wants (if the EV car wants 32A then the charger can 'refuse' for example). It also monitors the ground lead's integrity.
--- End quote ---
That's not how it works - the EVSE tells the car how much it's allowed to draw via the PWM signal on the CP pin. The car should never draw more than this.
And EVSE does not actually need to monitor the car's current draw at all.
It will also not usually monitor ground integrity, just provide residual current protection for AC, and ideally DC faults.
However due to the earthing requirements of the latest UK wiring regs, which sometimes require a local grounding rod, some EVSEs get around this by being able to isolate the earth connection. In this case it should have some monitoring to ensure that the earth is connected before applying power, i.e. the earth isolation relay hasn't failed open.
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