DC Charge Rate for BEV - 2018 Honda Clarity Forum
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post #1 of 15 (permalink) Old 10-12-2020, 02:07 PM Thread Starter
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DC Charge Rate for BEV

I assume there is a post somewhere, but I cannot find it. Does anyone know what the official max DC charge rate is for the Clarity Electric (2019 specifically, not sure if it changed from year to year)? I've seen mine top out at about 30 kW, but I wasn't sure if that's what the limit is or if it's just the chargers I've been using.
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post #2 of 15 (permalink) Old 10-12-2020, 02:49 PM
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6.6KWh, which translates to 4 hours to charge using a 28 amp EVSE. (Source for max charging rate: www.clippercreek.com)

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post #3 of 15 (permalink) Old 10-12-2020, 04:02 PM
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Originally Posted by obermd View Post
6.6KWh, which translates to 4 hours to charge using a 28 amp EVSE. (Source for max charging rate: www.clippercreek.com)
He was asking about the DCFC rate, which bypasses the charger in the car (which will draw up to 32A but typically 7.2 kW @ 240V even thought the specs say 6.6).

The max DCFC rate is going to depend on the amperage of the charger.
The nominal Voltage of the Clarity pack is 311, so on a 100A charger it will be close to the 30 kWh you are seeing (at low SOC%). If you connect to a charger that supports 125A, you will see up to 39 kWh. The taper starts at about 70% SOC.

Li-Ion DCFC starts at constant current, then switches to constant voltage, so as the battery charge increases you'll see the charging voltage increase and the amperage drop (at some point the voltage remains constant at ~ 348).

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post #4 of 15 (permalink) Old 10-12-2020, 05:32 PM Thread Starter
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Thanks for the info. I hadn't looked at the intricacies of how DCFC worked, that's good to know.
Do you know if there is an upper limit the batteries can support, assuming the charger can support any amperage?
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post #5 of 15 (permalink) Old 10-12-2020, 06:20 PM
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Based on the battery size and the ChargePoint article on the Clarity Electric stating 80% charge in 30 minutes, I'm estimating the peak DCFC charge rate is between 30 and 40 KWh. The reason for this range vs. a single number is the ChargePoint article doesn't say the starting SOC when charging to 80% in 30 minutes.

Battery size: 25.5KWh
Charging 10% to 80% in 30 minutes => 40KW
Charging 20% to 80% in 30 minutes => 30KW

2018 Honda Clarity Touring PHEV - Forest Green w/Tan interior (wife's car)
2017 Volt LT - Heather Gray; black bow ties, Charcoal VoltShelf
2012 Cruze ECO MT (hail totaled 5/8/17 103,600 miles @42.5 MPG)
2010 Mit Lancer GT MT (traded for ECO @31K miles)
2002 Pont Montana AWD - title to son at college graduation
1990 Pont Transport (traded for Montana @240K miles)
1986 Fiero GT MT (traded for Transport - needed more seats)
1985 Fiero 2M4 MT (traded for Fiero GT @8K miles)
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post #6 of 15 (permalink) Old 10-12-2020, 06:28 PM
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Originally Posted by ticker47 View Post
Thanks for the info. I hadn't looked at the intricacies of how DCFC worked, that's good to know.
Do you know if there is an upper limit the batteries can support, assuming the charger can support any amperage?
The limit is 125A. Charging at an Electrify America 300A/150 kW charger doesn't yield anything more than a 125A unit.

Honda has determined that 125A (~40 kW) is the upper limit and the Battery Management system will not pull anything more than that from a charger.

Note: A "50 kW" charger can get there by a rating of 100A @ 500V, or 125A @ 400V. Since the Clarity (and most other EVs) will not draw more than 400V, the 125A units will charge faster (higher kW).

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post #7 of 15 (permalink) Old 10-22-2020, 07:01 AM
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Originally Posted by obermd View Post
6.6KWh, which translates to 4 hours to charge using a 28 amp EVSE. (Source for max charging rate: www.clippercreek.com)
Keep in mind that kWh is a measurement of quantity of energy, not a rate. You could say that a battery charges at a rate of 6.6kW **per** hour (rate). If it could charge at that rate for four hours then it would have received 26.4kWh of energy (amount).
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post #8 of 15 (permalink) Old 10-22-2020, 12:02 PM
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Quote:
Originally Posted by ClarityDave View Post
Keep in mind that kWh is a measurement of quantity of energy, not a rate. You could say that a battery charges at a rate of 6.6kW **per** hour (rate). If it could charge at that rate for four hours then it would have received 26.4kWh of energy (amount).
KWh is shorthand for KW per hour, which is a rate.

2018 Honda Clarity Touring PHEV - Forest Green w/Tan interior (wife's car)
2017 Volt LT - Heather Gray; black bow ties, Charcoal VoltShelf
2012 Cruze ECO MT (hail totaled 5/8/17 103,600 miles @42.5 MPG)
2010 Mit Lancer GT MT (traded for ECO @31K miles)
2002 Pont Montana AWD - title to son at college graduation
1990 Pont Transport (traded for Montana @240K miles)
1986 Fiero GT MT (traded for Transport - needed more seats)
1985 Fiero 2M4 MT (traded for Fiero GT @8K miles)
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post #9 of 15 (permalink) Old 10-22-2020, 04:52 PM
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Originally Posted by obermd View Post
KWh is shorthand for KW per hour, which is a rate.
kWh is a unit of energy (capacity)

kW is a measure of power (rate)

kW per hour is something else entirely that is roughly equivalent to saying "gallons per minute per hour" when talking about pumping gas.
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post #10 of 15 (permalink) Old 10-24-2020, 03:06 AM
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Originally Posted by DucRider View Post
kWh is a unit of energy (capacity)

kW is a measure of power (rate)

kW per hour is something else entirely that is roughly equivalent to saying "gallons per minute per hour" when talking about pumping gas.
Exactly. When I get my electric bill at the end of the month stating that I used 1300 kWh, it has nothing to do with the rate at which I used the electricity. It has to do with the amount of energy, in total, that I used.
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