Minimum power for CCS DC Charging

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elt93

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Hi Guys,
I have been looking a lot at the different types of EV charging available out there and found a lot of information about everything but just have one last question that I haven't been able to answer on my own. I saw that DC CCS Type 2 Charging usually maxes out on most cars at 50kW but what is the minimum charging power? Could I theoretically charge a car at 100W using DC CCS at the right voltage (430V)?
Thank you for your time and help!
 
elt93 said:
Hi Guys,
I have been looking a lot at the different types of EV charging available out there and found a lot of information about everything but just have one last question that I haven't been able to answer on my own. I saw that DC CCS Type 2 Charging usually maxes out on most cars at 50kW but what is the minimum charging power? Could I theoretically charge a car at 100W using DC CCS at the right voltage (430V)?
Thank you for your time and help!
Click to expand...
There is a handshake between the car and the charger that limits the current as the battery approaches full charge. The car has to tell the charger what current. Sad to say, there is an SAE paper that has to be purchased to read the full technical specs. I only have the J1772 specs.

Now if we take 100W / 430V ~= 0.25 A. I've only seen integer amps on the chargers I've used.

Bob Wilson
 
Hi Bob,
Thank you very much for your answer. From what I can infer,there is not any low limit for DC charging using the CCS? It is possible to push through 1kW as much as 50kW?Thank you!
Eliott
 
elt93 said:
Hi Bob,
Thank you very much for your answer. From what I can infer,there is not any low limit for DC charging using the CCS? It is possible to push through 1kW as much as 50kW?Thank you!
Click to expand...
Without reading the spec or the maintenance and operation manual, I would only share the lowest I've seen is 3 A @395 VDC:
CCS_end_010.jpg

The last frame of two, 30 min. charging sessions at the free, fast DC charger in Huntsville, AL. So 3 A * 395 VCD ~= 1.185 kW.

So my NEMA 14-50 outlet has a maximum current of 40 A (usable) * 240 VAC ~= 9.6 kW. However the built-in charger of our BMW i3 is power limited to ~7.2 kWh. If an efficient DC power supply feeding a proper CCS plug, we could see an extra 2.4 kW. But it would only have an advantage if the SOC is less than 90%.

Bob Wilson
 
Last edited:
Here is a short video, ~1 min., showing two, 30 minute charge sessions of a 2014 BMW i3-REx:


Bob Wilson
 
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