Alessandro
Member
How efficient is the i3 if charged from a 110 V/230 V home socket ? Have you ever tried to charge your i3 at home and, if so, how many kWh does it take from a flat (or near flat) battery to full capacity ?
Alessandro said:How efficient is the i3 if charged from a 110 V/230 V home socket ? Have you ever tried to charge your i3 at home and, if so, how many kWh does it take from a flat (or near flat) battery to full capacity ?
That's exactly what the EPA measured in its tests. 22 kWh out of the wall, 18.8 kWh into the battery => 85% efficiency.mindmachine said:So approximately 22 Kwh on 220 volt.
ultraturtle said:That's exactly what the EPA measured in its tests. 22 kWh out of the wall, 18.8 kWh into the battery => 85% efficiency.mindmachine said:So approximately 22 Kwh on 220 volt.
I'll sample the approximate L1 (120 volt) EVSE efficiency later today after a short drive, although the average sample of recharging after many longer drives would be a more useful number.
KurtEndress said:A couple weeks ago I made careful note of my 120V charging. It took 8.5 hours to recharge from 58% SOC. That's replacing 7.9 kWh at an effective rate of 930 watts. Since it was drawing about 1400 watts from the wall that's about a 66% efficiency.
That probably deserves more than a single test, but since I just got my 240V charger installed I be monitoring that now.
kevinb61 said:KurtEndress said:A couple weeks ago I made careful note of my 120V charging. It took 8.5 hours to recharge from 58% SOC. That's replacing 7.9 kWh at an effective rate of 930 watts. Since it was drawing about 1400 watts from the wall that's about a 66% efficiency.
That probably deserves more than a single test, but since I just got my 240V charger installed I be monitoring that now.
Wow...All I use is the occasional charger (110v), and with my measurements (kill-a-watt, and couple others devices), I have never seen worse than 85%.
mindmachine said:kevinb61 said:KurtEndress said:A couple weeks ago I made careful note of my 120V charging. It took 8.5 hours to recharge from 58% SOC. That's replacing 7.9 kWh at an effective rate of 930 watts. Since it was drawing about 1400 watts from the wall that's about a 66% efficiency.
That probably deserves more than a single test, but since I just got my 240V charger installed I be monitoring that now.
Wow...All I use is the occasional charger (110v), and with my measurements (kill-a-watt, and couple others devices), I have never seen worse than 85%.
I too am really surprised at the low efficiency attributed to 120 volt charging.
Conditions were 78 degree garage, BMW Occasional Use Charge Cable (Nominal 12 amp, 120 volt, Level 1 EVSE), unloaded wall socket voltage 119.8 volts, dropping to 111.0 volts under load, initially drawing 1.22 to 1.31 kW. Charge took 5 hours 45 minutes:ultraturtle said:I'll sample the approximate L1 (120 volt) EVSE efficiency later today after a short drive, although the average sample of recharging after many longer drives would be a more useful number.
ultraturtle said:Battery kWh charged: 5.6 kWh (13.7 to 19.3 kWh, or 73% to 100% SOC) measured from the i3 display
Drawn from wall outlet: 7.36 kWh - measured by Kill-A-Watt
Efficiency: 76%
Interesting that the car shows 19.3 to 19.4 kWh capacity.
Alessandro said:my understating is that it's much more difficult to charge the "last" kWh than the previous ones, a cleverer sample should be to charge the battery from zero to 100% - if you have time and opportunity to do this experiment
elptex said:Alessandro said:my understating is that it's much more difficult to charge the "last" kWh than the previous ones, a cleverer sample should be to charge the battery from zero to 100% - if you have time and opportunity to do this experiment
That has to do with the battery, not the electricity supply. It isn't a matter of 'difficult', it is to protect the battery.
I will not do it, as I not only seldom deplete the battery capacity (only once in 1,500 miles), am confident that L2 charging is significantly more efficient (having measured both on other EVs), and do not have a planned 20 hour block of time for the car to sit on a charger.Alessandro said:a cleverer sample should be to charge the battery from zero to 100% - if you have time and opportunity to do this experiment
The EPA measured it at 22 kWh:Alessandro said:I' m rather interested to the kWh consumption to fill up the i3, not in particular a comparison between 230 V and less efficient 110 V (and not the time to charge it, either)
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