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30A Circuit Breaker tripped on Nissan Leaf

Posted: Tue Sep 04, 2012 9:37 am
by yorkhung
After waiting for my electrician to come for three weeks, I finally had it and decided to install the charger myself.
I have a 30A circuit breaker on the wire so I thought it wouldn't be tripped because Nissan Leaf suppose to draw 16A only.
However, after the successful charge the first night, my circuit breaker starts to trip after 15 min or so of charging.
I know the EVSE rated 32A so I should install it on a 40A+ breaker but shouldn't the EVSE limited itself to Nissan Leaf's 16A?
The EVSE return deadline is next week so I'm wondering if it will help if I get the 16A unit instead or have to rewire the breaker.

Thanks

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Re: 30A Circuit Breaker tripped on Nissan Leaf

Posted: Tue Sep 04, 2012 10:33 am
by FairwoodRed
You’re right that the Leaf can only pull 16 amps at 240 volts and it should not have tripped a 30 amp breaker.

Strictly speaking, I recommend that you get the correct 40 amp breaker for your 32 amp EVSE. Also, I recommend that DIY electrical work be permitted and inspected by your local jurisdiction before being used.

Having said that, any chance of getting a few photos of the breaker and the outlet? What brand/model EVSE do you have?

Re: 30A Circuit Breaker tripped on Nissan Leaf

Posted: Tue Sep 04, 2012 11:17 am
by defiancecp
It may be a worn breaker. I had an existing 40A circuit I repurposed for my leaf charger - it started tripping, which worried me until I figured out the breaker itself had failed and would trip with much lower than expected amperage. Replaced the breaker and all was well again.

Re: 30A Circuit Breaker tripped on Nissan Leaf

Posted: Tue Sep 04, 2012 11:39 am
by Nubo
Is the EVSE the only active load on this circuit?

Re: 30A Circuit Breaker tripped on Nissan Leaf

Posted: Tue Sep 04, 2012 11:44 am
by yorkhung
The circuit is linked to other circuit like garage door and light.
But I only charge at 12pm - 6am so there was no other circuit using the power at the same time.
The unit is Leviton Evr-Green 320 and I am wondering if the unit is drawing peak current more than 16A for Leaf.
I would like to attach picture but doesn't see the forum is allowing that.

Re: 30A Circuit Breaker tripped on Nissan Leaf

Posted: Tue Sep 04, 2012 12:01 pm
by camasleaf
yorkhung wrote:The circuit is linked to other circuit like garage door and light.
Do you have 240V garage door opener and lights? Did you use two single pole breakers or a two pole breaker?

Re: 30A Circuit Breaker tripped on Nissan Leaf

Posted: Tue Sep 04, 2012 12:15 pm
by FairwoodRed
yorkhung wrote:The circuit is linked to other circuit like garage door and light.
But I only charge at 12pm - 6am so there was no other circuit using the power at the same time.
The unit is Leviton Evr-Green 320 and I am wondering if the unit is drawing peak current more than 16A for Leaf.
I would like to attach picture but doesn't see the forum is allowing that.
All of a sudden, I'm concerned for the safety of your installation. The Leviton needs to be on its own circuit breaker per code.

If you ignore code, it might work if your garage door and light are 240 volt, but that is not standard. Please don't use this wiring as is.

If you go to a photo hosting site (like Photobucket) you can upload your photos and then copy the forum link they give you to share them here. I'd really like to see how things are wired now.

Re: 30A Circuit Breaker tripped on Nissan Leaf

Posted: Tue Sep 04, 2012 12:48 pm
by LEAFer
FairwoodRed wrote:All of a sudden, I'm concerned for the safety of your installation.
+1 !!!!

And you did not mention what gauge wire this circuit is using. Given the sketchy description ... you should contact an alternate licensed electrician.

Re: 30A Circuit Breaker tripped on Nissan Leaf

Posted: Tue Sep 04, 2012 12:56 pm
by adric22
LEAFer wrote: And you did not mention what gauge wire this circuit is using. Given the sketchy description ... you should contact an alternate licensed electrician.
Yeah - that's a good point too. if the gauge is too small it will create extra resistance and trip the breaker... or worse, a fire.

Re: 30A Circuit Breaker tripped on Nissan Leaf

Posted: Tue Sep 04, 2012 1:25 pm
by Rusty
LEAFer wrote:And you did not mention what gauge wire this circuit is using. Given the sketchy description ... you should contact an alternate licensed electrician.
Adding to that you should ignore the suggestion to just swap the 30A breaker out for a 40A one, unless you are absolutely certain the gauge wire you have in the circuit is correct for 40 amps. Otherwise you're a fire waiting for a place to happen, and one for which your insurance will say "Oh, so sorry - your fault."

The breaker shouldn't be sized for the load you're expecting, it should be sized for the length and gauge (and a few other things, like type and routing) of the wire it's protecting. Yes you can put a 30A breaker on to wire that'll support 40A, but IMHO that just confuses things down the road if you (or anyone else) need to do future electrical work.

If you're not certain of what you're doing, get an electrician. The home you save may be your own...