daveo4EV
Well-Known Member
- First Name
- David
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- Jan 28, 2019
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- Cayenne Hybrid, 911(s) GT3/Convertable
they can be - but to accomplish that the EVSE just pretends to be "disconnect" or "offline" so the car thinks it's not plugged in.I thought that the AUTEL EVSE can be timed to charge at a certin time. I'll look again.
it would be like putting your XMAS lights on a timer - just chop teh power and they turn off
EVSE's are quite "dumb" and the amount of interaction they have with the vehicle is limited by conformance with the J-1772/ISO charging protocols - which themselves are quite basic, simple and rudimentary…
but the general model is that of a "flow control" device - their job is simple and breaks into the various bullet points
- safety - if they are not actually plugged into a vehicle no power flows in the charging cord to avoid electrocution
- flow control of power until the control of the vehicle - power goes on, power goes off
- reporting to the vehicle the maximum power they can provide - so that the vehicle doesn't "overload" the circuit by demanding more power than can be safely provided
- this is easily demonstrated every time you charge your Taycan with a PMC+/PMCC - Taycan is an 11/19.2 kW vehicle, but when plugged into a PMC+/PMCC in north america it limites it "requested" power to 9.6 kW (40 amps) because the PMC+/PMCC "tell" the vehilce it can only provide 40 amps.
"advanced" EVSE following "optional" ISO protocol can also harvest vehicle information such as VIN, battery SOC state, and other stats about the vehicle- but they are still honestly very very simple devices mostly there for safety - not control.
any EVSE (autel/tesla/chargepoint) that offers scheduling support only does so by simple disconnecting from the vehicle when they can not provide power - this will prevent the vehicle from charing during those hours, but for this to work oyu have to fore-go using the vehicle's onboard scheduling - since the EVSE can not force power into the vehilce and/or force it to charge - this only works if the vehicle is configured to charge when ever it's plugged in…
if your EVSE is programmed to allow charing between 11 pm and 7 am
and your Taycan is programed fro depature time charging at 6 am
your EVSE will be "offline" until 11 pm - will turn on at 11 pm - but the Taycan remain "waiting" until like 2 hours before 6 am and begin charging at 4 am to meet it's 6 am dead line
but it will fail to charge if you have a 9 am departure schedule in the Taycan
EVSE offline until 11 pm - online until 7 am
Taycan "knows" it has departure timer for 9 am - it also knows it only need 90 minute to charge - so internally the taycan schedule itself to begin charging at 7:30 am
11 pm comes around - EVSE pop's "online" - Taycan says great - I'm going to wait until 7:30 am to begin charging to reach my 9 am depature time
7 am comes around EVSE drops offline - Taycan see's "no power/no cord" -
your Taycan never charges because it's schedule required power to be available at 7:30 am - but your EVSE schedule drops it offline at 7 am…
EVSE's are "dumb" devcies - they do not charge your car - they simple provide on/off control for the car to cause power to flow or not-flow - the CAR controls charging the battery - the EVSE just pasively waits for the car to "request" power.
all North American EVSEs are really at the end of the day just an "on/off" switch until control of the vehicle they are plugged into - nothing more/nothing less…if they are not plugged into a vehicle the "switch" is OFF for safety - when they are plugged into a vehicle the switch is "OFF" until the vehicle sends a command to allow the power to "flow" - but the default state for an EVSE is that power flow is "OFF" - power is only allowed to flow once conditions are "met" to allow power to flow safely…
if we didn't ahve EVSE's we would just use extension cords - but that's problematic because power is always flowing with an extension cord, and if you dropped it in a puddle it would short out - J-1772 connectors are "safe" when not connected to a vehicle.
the EVSE does not control your car or the charging - it provides raw power when the car requests power - it is NOT a charger - it is a power supply…in fact it's name is EVSE
Electric
Vehicle
Supply
Equipment
it provides a raw AC 240V power source to your Taycan's onboard charger - the EVSE does know how to charge your Taycan's battery - only the software/hardware inside your Taycan "know" how to charge the battery - the EVSE provide a raw source of power to accomplish the charging…but fundementally doesn't have any specific knowledge as to how to charge a LiON battery - this is also why they are universal and can charge _ANY_ EV - it's because they are simply a "raw" 240V power source - nothing specific to any vehicle is provided.
my 12 year old 32 amp Ford EVSE is still doing duty at my friends house charging his 2022 eTron SUV - and I'm positive it will successfully charge my 2024 Macan EV when the time comes…cause it's just a faw AC power source.
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