Last week i let my battery run down to 9 miles left on battery before fully charging it. 15.05kwh/59 miles were added and it was 35 to 40 degrees for that charge. tonight it was 60 degrees outside and i had 20 miles left on my battery when i fully charged it. u would think less kwh were needed to charge it since i had 20 miles instead of 9. the opposite happened. it took 16.02kwh/63 miles before full. I dont understand. did the warmer weather allow my battery to soak up more miles/kwh than when it was 35 degrees outside. im confused.
Help? Strange thing happened when charging to full??
- Thread starter evboy
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Does your EVSE have a kWh display? How are you coming up with these 'charge amount' numbers?
If your EVSE does report, or your using a public networked EVSE, TMS power consumption is part of that number. L1 vs L2 vs L3 charging has different efficiency also.
But you're right. Why the big difference?
As for the 'miles' part, that is a product of your GOM and is, as you know, only a Guess. That is not useful data. Only a vague report of how you used the last few battery cycles.
If your EVSE does report, or your using a public networked EVSE, TMS power consumption is part of that number. L1 vs L2 vs L3 charging has different efficiency also.
But you're right. Why the big difference?
As for the 'miles' part, that is a product of your GOM and is, as you know, only a Guess. That is not useful data. Only a vague report of how you used the last few battery cycles.
35 degrees will definitely have lower efficiency while driving compared to 60 degrees. Also, if you had been running the heater or defroster in the 10-20 miles before the first charge, that would also have affected your estimated range. If you had been driving more highway before the first charge and more city before the second, the efficiency would have also changed.
The miles left is not a hard number, it is and estimate based on how you have been driving. I the same way that rated gas efficiency depends on driving the same way they would for an EPA test (ypu can get better or much worse efficiency). It is quite possible to have 10% left showing 5 miles one time and 12 miles another for the same 10%.
The miles left is not a hard number, it is and estimate based on how you have been driving. I the same way that rated gas efficiency depends on driving the same way they would for an EPA test (ypu can get better or much worse efficiency). It is quite possible to have 10% left showing 5 miles one time and 12 miles another for the same 10%.
so the fact that chargepoint added 16 kwh the second time vs 15 kwh the first is hard evidence that i actually had a emptier battery on the second charge vs the first charge and didnt know it. that is kind of scary if you like to take chances that u wont get stranded driving that last 5 miles. when chargepoint says it added 16 kwh, that is not a estimate? correct??67goat said:
Correct, but depending on the temp of the battery during the charge a certain amount of power went to the TMS.evboy said:
That, along with the normal charge losses makes the 'Goes in' power not as accurate as the 'Goes out' power.
