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Re: What's the maximum charging voltage?

Posted: Wed Aug 12, 2015 8:49 pm
by johnrhansen
what if you have a 50 amp EVSE? What's the most current the leaf can draw at 208 volts?

Re: What's the maximum charging voltage?

Posted: Wed Aug 12, 2015 8:57 pm
by TomT
The car is likely to be the limiting factor as few can draw 50 amps (Tesla primarily) ...

johnrhansen wrote:what if you have a 50 amp EVSE? What's the most current the leaf can draw at 208 volts?

Re: What's the maximum charging voltage?

Posted: Wed Aug 12, 2015 9:06 pm
by GerryAZ
johnrhansen wrote:what if you have a 50 amp EVSE? What's the most current the leaf can draw at 208 volts?


It would probably draw between 31 and 32 amperes if it has the 6 kW onboard charger, otherwise it would draw about 18 amperes for the 3.3 kW charger. It would draw a bit more to compensate if the voltage sags below 208.

Owner manual for 2015 lists maximum rated current at 32 amperes (if equipped with 6 kW charger) or 18 amperes (if equipped with 3.3 kW charger).

Gerry

Re: What's the maximum charging voltage?

Posted: Wed Aug 12, 2015 9:28 pm
by johnrhansen
Thanks, Gerry, that was helpful info.

Re: What's the maximum charging voltage?

Posted: Fri May 10, 2019 5:14 am
by Tsiah
kajol wrote:I just got a 16/32 volt buck/help transformer, 1kva. I'm supposing it may enable my charge to hold up time on excursions by raising the charging voltage a tad. I realize 240 is great, and that is the primary concern I'm attempting to do is to take the 208 volts from certain spots and knock it to 240. In any case, imagine a scenario in which I took the 240 and knock it up to 272. Would that sear the leaf



The car doesn't care if you give it 208V or 240V. It'll draw 6.6kW and charge. It'll draw ~31A@208V and~27A@240V. I don't know what the max input voltage is for the charger, but I don't see any point or advantage to raising it above 240V, nor do I see any advantage to bumping to 240V from 208V.
1kVA is 1000W. You're going to decrease your charge wattage by 5600W with that little transformer.

Re: What's the maximum charging voltage?

Posted: Fri May 10, 2019 6:33 am
by Nubo
kajol wrote:I just got a 16/32 volt buck/help transformer, 1kva. I'm supposing it may enable my charge to hold up time on excursions by raising the charging voltage a tad. I realize 240 is great, and that is the primary concern I'm attempting to do is to take the 208 volts from certain spots and knock it to 240. In any case, imagine a scenario in which I took the 240 and knock it up to 272. Would that sear the leaf


Moderator - this user seems to simply be parroting previous posts as a pretense to putting their spam link out there.

Re: What's the maximum charging voltage?

Posted: Fri May 10, 2019 9:58 am
by 91040
^^^I reported the first two posts by kajol to the moderator the other day. Hopefully, they will act.

Re: What's the maximum charging voltage?

Posted: Fri May 10, 2019 12:55 pm
by LeftieBiker
91040 wrote:^^^I reported the first two posts by kajol to the moderator the other day. Hopefully, they will act.


The spammer and his posts are now gone. I'm not going to bother deleting the quotes of the posts unless the authors request it - their posts would make no sense without the quotes. I did delete the link in the quotes.

Re: What's the maximum charging voltage?

Posted: Sat May 11, 2019 6:18 am
by jjeff
Tsiah wrote:
kajol wrote:I just got a 16/32 volt buck/help transformer, 1kva. I'm supposing it may enable my charge to hold up time on excursions by raising the charging voltage a tad. I realize 240 is great, and that is the primary concern I'm attempting to do is to take the 208 volts from certain spots and knock it to 240. In any case, imagine a scenario in which I took the 240 and knock it up to 272. Would that sear the leaf



The car doesn't care if you give it 208V or 240V. It'll draw 6.6kW and charge. It'll draw ~31A@208V and~27A@240V. I don't know what the max input voltage is for the charger, but I don't see any point or advantage to raising it above 240V, nor do I see any advantage to bumping to 240V from 208V.
1kVA is 1000W. You're going to decrease your charge wattage by 5600W with that little transformer.

This is totally incorrect, at least for both my '12 and '13 Leafs :)
My cars max out at either 16a(for the '12) or 27.5a(for the '13) so voltage makes a large difference for me AFA charging speed. It's my belief the 3.6kW or 6.6kW ratings are at maximum voltage or 240v, if you use 208v the Kw will be less. Now you Leaf may be different than mine but I know voltages and amps and know how my Leafs work(and have several EVSEs that display instantaneous amperage) :)

Re: What's the maximum charging voltage?

Posted: Sat May 11, 2019 7:51 am
by GerryAZ
My 2011 would draw about 16 amperes at 240 volts at home and 18 amperes at 208 (usually about 212) volts at my workshop/garage. The 2015 draws about 27 amperes at 240 volts and 30 amperes at 212 volts. I suspect it would draw a little more (probably up to 32 amperes) if the voltage were lower. Therefore, as stated before, there is not much difference in charging rate unless EVSE current limit is reached.