Zoe single phase charging

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doggy
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Zoe single phase charging

Post by doggy »

With the sale of the last Zoes in Oz and quite a few questions about charging, here are the single phase charging efficiency figures I measured and published some time ago. They will quantify the efficiency of low end charging:

"Three phase charging of Zoe at 22kW is pretty good. Typically, as long as the SOC is 80% or below, I get 20.7kW into the battery at the DC level. So, 94% or better.

Here are some single phase figures I have just measured on my Zoe at 75% SOC:

Pilot=32A. Actual=32A. Power at meter box=7.6kW. Power at EVSE input=7.35kW. Power to 12V battery=100W. Power to HVbat=6.5kW (377V 17.3A). Efficiency=90%
Pilot=20A. Actual=20A. Power at meter box=4.89kW. Power at EVSE input=4.75kW. Power to 12V battery=60W. Power to HVbat=4.05kW (374.5v 10.8a). Efficiency=86%
Pilot=10A. Actual=9A. Power at meter box=2.12kW. Power at EVSE input=2.04kW. Power to 12V battery=50W. Power to HVbat=1.61kW (375V 4.3A). Efficiency=81%
Pilot=6A. Actual=6A. Power at meter box=1.11W. Power at EVSE input=1.06kW. Power to 12V battery=50W. Power to HVbat=0.56kW (375V 1.5A). Efficiency=55%

Several points:
a. I have corrected for power to the 12V battery. This could be significant at low charging currents if accessories have been in use.
b. If the aircon has to run to cool the battery, you have zero left at 6A as it will use between 500 and 1000W.
c. Powers are measured with a 1% accuracy power meter, so reactance and power factor are taken care of. Power factor is somewhat below 1 between 6 and 10amps
d. If we turn the above figures upside down and calculate how much power we actually need to add 32kW from 0% to 80% SOC we get the following:

32A three phase. 34kWhrs. Wastage=2kWhrs
32A single phase. 35.7kWhrs. Wastage= 3.7kWhrs
20A single phase. 37.2kWhrs. Wastage= 5.2kWhrs.
10A single phase. 39.5kWhrs. Wastage= 7.5kWhrs.
6A single phase. 58.2kWhrs. Wastage = 26.2kWhrs"

Here is a link to my original post:

viewtopic.php?f=57&t=5976&sid=8bb37907d ... d4f9f7bff1

Regards,
Dave
spod
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Re: Zoe single phase charging

Post by spod »

That's great info, I think I need to order that 32A EVSE...
spod
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Re: Zoe single phase charging

Post by spod »

Well, got the Marvin EVSE, so will try to get it installed this weekend and post a pic.
Jackmoz
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Re: Zoe single phase charging

Post by Jackmoz »

We have just installed a Zappi V2 today, now for the Zoe to arrive next week!
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spod
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Re: Zoe single phase charging

Post by spod »

Well, Marvin is up and running,the Zoe is charging quite a bit faster now...

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