Re: A peek at the Leaf's Charger
Posted: Thu Oct 11, 2012 1:01 pm
When you connect the car with a charge timer set, it turns on the EVSE for a few seconds to check the voltage. I expect that it also reads the amperage specified by the pilot signal. This it will limit to 16A (or 12A at 120V). I doubt that it actually starts a short charge and measures the power output by the charger. There's no need - it knows that the OBC will only generate 3.3KW; why go to the effort of measuring it?planet4ever wrote:Not completely hardwired, because the timer is aware of the capacity of the EVSE. The 120v aspect is obvious, but I'm sure it must also be taking the EVSE's amperage into its calculation. I have Phil's 12A upgrade, and use an end-only timer. If the timer assumed 3.84kW (the 16A max at 240v, enough for the charger output to be 3.3kW) and my EVSE could only give it 2.88kW, I wouldn't reach 80% by the cutoff time. But I always do, with lots of time to spare.Nekota wrote:I suspect the BCM or what ever measures the current for coulomb counting see's the increase in current and reports it as amps. But I'm not surprised the charging time is hardwired to the 'expected' 3.3KW LEAF charger.grommet wrote:Phil told me at National Plug-in day that the LEAF itself has no clue the extra charger exists... so charge time estimates on the dash, timer, etc. won't change. No big deal.
Anyone want to bet there is a CAN signal the timer is watching for that tells it what the charger capacity is?