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..., level 2 is anything above the 125 volt limit for level 1 (OK, we are also talking about only 208/240 volt circuits). The upper limit for level 2 charging is 100 amps rating but NEC only allows 80% or 80 amps for a continuous duty load which is what electric vehicle charging is. The EVSE and the related connector does not determine the rate at which a vehicle will charge unless the vehicle's on-board charger is capable of loads greater than the EVSE is capable of supplying. The communications between the EVSE and the vehicle will lower the demand from the vehicle if the EVSE is not capable of supplying the amperage the vehicle is capable of receiving. Most EVSE is going to be rated at 40 amps or something less. Very few (Tesla and BMW units aside) vehicles will actually be capable of receiving more than 32 amps (80% of 40 amps). Major difference between the 40 amp rated units and the 100 amp rated units will be size of the wiring in the connector cord. The J1772 connectors and receptacles are going to be primarily 100 amp rated units (no need to have varying sizes as the pin sizes and locations are predetermined regardless of the amp rating of the EVSE). However, someone will need to provide to UL the units for certification at that amperage.
6.6 kW is the nominal rating for vehicles receiving 30 amps from the EVSE. Since voltage is variable depending on whether the circuit is 208 volts (primarily commercial locations feed from 480 volt three-phase supply circuits) or 240 volts (primarily residential locations where only single-phase power is available) and not constant depending on loads on the circuit and wire size. The 3.3 kW is the nominal rating for vehicles receiving 15 amps from the EVSE.
The 50 kW chargers are going to be connected to three-phase power (primarily 480 volts) and will require 60 plus amps from each phase. FYI, if connected to a single-phase 240 volt circuit as proposed, the current demand would be north of 200 amps. 200 amp service is a common service for a home with central air and other electric intensive appliances like clothes dryers, ovens and stoves.
...expect to see 32A (for 40A 208-240V circuits) J1772 cordsets
available by early 2010. It's the 70-80A version that is in limbo.
Reason: low volume. Nobody is stepping up to funding the tooling and
the UL approval process for the 70-80A version.
The existing infrastructure is 32A on 40A 208-240V circuits. Those
circuits are reusable for the new infrastructure, as I indicated in
earlier replies.
There will be 15A J1772 cables (for 20A 208-240V circuits), but those
should not be installed in public infrastructure. Any vehicle that
can use the 15A J1772 cable can also use the 32A J1772 cable.
Hmm... again it seems [the Germans have worked a lot of this out. Can't we follow zee Germans?
Could you remind me what EVSE stands for?
4:25 [Comment From John Brown ]
Are charging cables now standardized so that Volt, LEAF and other plugins have the same plug and specs?
4:25 Britta Gross: Yes, GM's Gery Kissel is chair of the SAE J1772 standards committee. The standard is going to a vote this week after two and a half years of work. All major automakers are expected to agree to adhere to these charging standards. All infrastructure that goes in from now on should be J1772 compliant so all plug-in vehicles can use it.
...All infrastructure that goes in from now on should be J1772 compliant so all plug-in vehicles can use it...
Well, GM clearly wants all new charge infrastructure to be J1772 standard compliant, however they are not in position to use more assertive language like must or will. DoE, on the other hand, is. At least to the extent of projects they fund. Then, there is always a possibility that some entity may decide to implement non-J1772 charging infrastructure, perhaps based on European-standard or some variant of DC fast charge, so there is an element of uncertainty here"Should be" sort of implies that it just may happen... Or at least some people think it is the right thing to do even if it doesn't happen.
Well, GM clearly wants all new charge infrastructure to be J1772 standard compliant,
Synonyms:
Must, ought, should express necessity or duty.
Must expresses necessity or compulsion: I must attend to those patients first. Soldiers must obey orders.
Ought (weaker than must) expresses obligation, duty, desirability: You ought to tell your mother.
Should expresses obligation, expectation, or probability: You are not behaving as you should. Children should be taught to speak the truth. They should arrive at one o'clock.
The article mentions quick charge socket being capable of 50 kW. Is plug design proprietary?
Would be nice to have a 50kW standard. Particularly since such stations will be more expensive to set up.
Explains the confusion with the i-MiEV quick charge connector. For some reason Mitsubishi keeps quoting the input of the charging station rather than what the car sees.Specifications
-Type: Switching type, constant current power supply
-Input: 3-phase 200V
-Maximum DC output power: 50kW
-Maximum DC output Voltage: 500V
-Maximum DC output Current: 100A
Should is one of those words that manufacturers in standardisation groups love. It gives them some wriggle-room not to do it :wink:
...The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119.
...
3. SHOULD This word, or the adjective "RECOMMENDED", mean that there
may exist valid reasons in particular circumstances to ignore a
particular item, but the full implications must be understood and
carefully weighed before choosing a different course.
...
3. SHOULD This word, or the adjective "RECOMMENDED", mean that there
may exist valid reasons in particular circumstances to ignore a
particular item, but the full implications must be understood and
carefully weighed before choosing a different course.
At stake in the debate is the public's
acceptance of EVs and plug-in hybrids. Or as
Renault SA project engineer Philippe Dupuy puts
it: "How many cables will you have in the trunk?