littldave
Posts: 3
Joined: Fri Mar 31, 2017 7:37 pm
Delivery Date: 09 Feb 2016
Leaf Number: 321099

Charge at 3kW rate with 6kW charger

Sun Apr 02, 2017 10:18 am

I have a '15 Leaf SV with a Level 2 6kW charger. I want to charge the car from my home's off-grid PV system which will support a 3kW charge rate but not the 6kW charge rate. (I can charge using the 6kW charger but only with my on-grid electrical system. If I an charge at 3kW I can charge for free.) Can I adjust the vehicle to charge at 3kW even though it has an on board 6kW charger?

The trickle charger works swell, but... since much of our driving is done while the sun shines, the car isn't available,while the sun shines, for the long charge times needed with the trickle charger.

I know, most folks want to know how to charge faster, I'd like to slow it down without going to the trickle charger.

Graffi
Posts: 399
Joined: Wed Nov 27, 2013 12:01 pm
Delivery Date: 06 Sep 2013
Leaf Number: 414757
Location: San Diego, CA

Re: Charge at 3kW rate with 6kW charger

Sun Apr 02, 2017 10:29 am

It is my understanding that no matter what size EVSE you use the vehicle will only use up to 6.6kw.

From the other direction, even though the Leaf can use up to 6.6kw, it will only use up to the amount of supplied electricity.

Now your issue is using an EVSE that is rated for higher power than what is available. In this case I believe that that using an EVSE and the onboard charger that has a higher limit than the electricity supplied will be okay, as it will only use up to the limit of what is being supplied.

If I am incorrect will someone please correct my understanding.
2013 SL Metalic Slate - We LOVE our Leaf
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littldave
Posts: 3
Joined: Fri Mar 31, 2017 7:37 pm
Delivery Date: 09 Feb 2016
Leaf Number: 321099

Re: Charge at 3kW rate with 6kW charger

Sun Apr 02, 2017 11:21 am

Thanks graffi!

You're probably right (I don't know this for a fact, will have to wait and see if others weigh in on the subject)

jjeff
Posts: 1364
Joined: Wed Jan 13, 2016 9:10 am
Delivery Date: 13 Jul 2014
Leaf Number: 422121
Location: MSP MN

Re: Charge at 3kW rate with 6kW charger

Sun Apr 02, 2017 11:53 am

You just need a EVSE that will allow you to lower the charge rate. Many will, some won't. Since you can't go over 3kw that eliminates the cheap fixed 16a L2 EVSEs, they charge at 3.6kw @ 240v. Probably your best option is to have your factory EVSE upgraded by EVSEupgrade.com to 16a, note 16a is the max, you can lower your charging down to as low as 6a if wanted and your upgraded charger will work on both 120v and 240v(12a max on 120v without spending $25 extra for a special 16a adapter cable). The upgrade cost itself is ~$300 depending on shipping.
Charge rate is the lowest of either your cars built in charger(and what it's requesting) or the max output of your EVSE is (or what it's set to for adjustable EVSEs).
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littldave
Posts: 3
Joined: Fri Mar 31, 2017 7:37 pm
Delivery Date: 09 Feb 2016
Leaf Number: 321099

Re: Charge at 3kW rate with 6kW charger

Sun Apr 02, 2017 12:05 pm

Thanks! jjeff!

dhanson865
Moderator
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Joined: Wed May 25, 2011 7:12 am
Leaf Number: 16156
Location: Tennessee

Re: Charge at 3kW rate with 6kW charger

Sun Apr 02, 2017 12:11 pm

evseupgrade will get you there but an openEVSE will give you a better user interface/more control/more future proofing should you need higher amps later.

Be sure to check eBay for old evseupgrades that someone might be selling. Even the 2011 and 2012 ones are valid for your low amp situation no matter what car you have (EVSEs are universal for the most part, don't let model years weed out a cheaper option).
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VitaminJ
Posts: 357
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Leaf Number: 415775
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Re: Charge at 3kW rate with 6kW charger

Mon Apr 03, 2017 8:53 am

You can DIY the upgrade and turn your Nissan EVSE into a 2.8kw EVSE for about $25.
http://www.instructables.com/id/313CONV ... HARGER-TO/
2013 Ocean Blue SV w/ QC and LED
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Durandal
Posts: 271
Joined: Wed Sep 21, 2016 8:55 am
Delivery Date: 22 Sep 2016
Leaf Number: 025018
Location: Central Arkansas

Re: Charge at 3kW rate with 6kW charger

Tue Apr 04, 2017 12:56 pm

littldave wrote:I have a '15 Leaf SV with a Level 2 6kW charger. I want to charge the car from my home's off-grid PV system which will support a 3kW charge rate but not the 6kW charge rate. (I can charge using the 6kW charger but only with my on-grid electrical system. If I an charge at 3kW I can charge for free.)

Running a two-circuit system? One on-grid, and the other off-grid? Do you have a blog post or other place where you've detailed your system? That's what I intend on doing with my recently acquired panels, so I was looking for others who have done something similar already. Thanks in advance.
Pulled the trigger on going EV on 10/2016 with a 2012 Leaf, and a Tesla Model 3 reservation expected to receive in June 2018.

alozzy
Posts: 525
Joined: Fri Jan 20, 2017 4:25 pm
Delivery Date: 18 Jan 2017

Re: Charge at 3kW rate with 6kW charger

Tue Apr 04, 2017 6:17 pm

@littldave, what plug type do you have on your L2 240V EVSE?

I don't know if it would be safe to do so (I can sense an onslaught of ridicule coming), but perhaps you could makeup an "adapter" cable with only (2) wires in use - a single hot and a ground.

Again, only if it's safe to do that, you would have 120V charging, but at the full amperage of your EVSE. Basically, that would cut your charging rate in half...

That way, you could still charge at full rate from the utility power, but use your adapter plug to charge at half rate when using your solar grid.

You can get the plugs on Amazon pretty cheap:

https://www.amazon.com/Camco-55353-Fema ... mco+14-50r

https://www.amazon.com/Camco-55255-Powe ... mco+14-50p

Then you would just need some heavy gauge wire.

I feel the flames starting to roast me :oops:
Vancouver, CA owner of a 2013 Ocean Blue SV + QC, purchased 01/2017 in WA
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