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Discussion Starter · #1 ·
In the last week, my 451 with now 3000 miles on it is exhibiting an odd behavior.

I drive it to work and plug into an outlet using the supplied EVSE. I always plug the EVSE into the outlet, insert the charging handle, then reach down and press the button to get it going at full current. It used to always then display the number of hours it would take to get to full charge, or at least show how full it predicted the charge would be at the time of my departure if I chose that option.

If I were a bit slow in pressing the button on the EVSE, the display would within seconds recalculate and show a new estimate.

In the past week, the display always shows as if the charging current were limited on the supplied EVSE. The display never recalculates based on the higher charging current before it goes out. I have to use the key to restart the car in order for the display to be correct. The times I haven't done this, it still does manage to charge at the full rate.

Has anyone experienced this, and could this be an early indication of some issue with the HV battery or supplied EVSE?


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Discussion Starter · #3 ·
Yes, when the instrument panel display shuts off, it is still showing a time representative of how long it would take at the low current charging rate. It is switching to the faster rate charging, but it's not doing it as quickly as it used to.

Interesting, but I think it is charging faster now. Even when I had the car set to "max", I never saw much more than 10-11 amps of charging speed. I think it's faster now as I'm able to get from 40% to 100% during a workday, whereas it would end up only around 95% previously. Maybe because my ED sat for the better part of two years, the batteries needed some cycles to kind of regain their full functioning?

I should go and do a range test again, or maybe run it pretty low and then charge it full in one shot to rebalance the cells.
 

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Discussion Starter · #8 ·
Also notice that the estimated time to full charge is pessimistic. What is interesting is just the change in behavior - how it now takes longer to recognize a change in the charging current.

I did charge it to full and then went out and did some steady, city-speed driving and the usage according to the on-board meters is about the same - just over 1 mile per 1% SOC so at least that aspect hasn't changed. I won't have time to really run it down until some time next week to test that end of the SOC spectrum.


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