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Discussion Starter #1
Been driving my 2017 LT for a week in Fresno. Our salesperson was quite clueless. After a week of frustration with charging i finally started looking at L2 options. I am confused by the math around battery capacity, charge rates, and time to full charge.

My understanding is that a 2017 has an 18.4kWh battery with an OBC capable of 3.6kWH charge rate. I am aware of ChrisTX' adapters that enable the OEM L1 charger to charge at 240V and 12A. Others have reported dropping charge times to 4.5 hrs with this which is just perfect for my needs. But i dont understand how since the math says that it should be 6.4 hrs. Could someone please look at the table below and explain where i have gone wrong?
V A. KWH. Time for full charge. Cost
120. 8. 0.96. 19.2. 0. OEM L1
120. 12. 1.44. 12.8. 0. OEM Setting for L1
240. 12. 2.88. 6.4. 50. $50 To build ChrisTX adapter
240. 15. 3.6. 5.1. - NA -
240. 20. 4.8. 3.8. $5xx. Commercial L2 chrager egs., Clipper Creek.

The 240/12 amp solution is just fine at 6.4 hrs. What i dont get is how people are getting 4.5 hrs with this solution.

Thanks
Prabha
 

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The usable portion of the battery is only 14.4 kWh

To fully charge it, depending on your wiring, it will take around 16kWh

On a level 2, you charge at 240v x 15Amp = 3600 kW and it will therefore take 4.45 hours to charge 16kWh
On the standard EVSE plugged on 240v, it uses only 12 Amps or charge at 2.88 kW, which will take 5.55 hours to do the job.
 

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Discussion Starter #3
Aah - i missed the part that i am only charging 14.4kWh. Now it makes sense.
Thanks for the clarification.
 
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