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EVDRIVER
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Re: 30A Circuit Breaker tripped on Nissan Leaf

Tue Sep 04, 2012 8:48 pm

Installed what charger? You likely have a 30A breaker on a 120 Circuit. Turn the breaker off and wait for someone qualified because it sounds like you have split two circuits or wired a 240V EVSE to 120V or something worse. I hope you did not pump 240 into some 120 devices. Pictures? Diagrams?

yorkhung
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Re: 30A Circuit Breaker tripped on Nissan Leaf

Tue Sep 04, 2012 9:34 pm

Here is my setup. I just shut off the circuit breaker and checked what's connected to the breaker.

Here are two things I found
1. Solar Water Heater Controller - Up to 9A
2. Sensor Light with two 60W bulb - About 1A

I think the suspect is the Water Heater Controller, if it draws max 9A, it would trip the circuit as Leaf 16A + 9A = 25A.
30A circuit breaker will only allow max current of 24A for continuous usage.
I also swap the 60W light bulb with the energy saving one just to draw less current.
Going to try it again tonight and hopefully removing the Solar Water Heater Controller will prevent the circuit from tripping.

PS. had just realize I only have 100A service panel, Think I'll have to upgrade it at some point when I'm getting second EV.
At that time maybe it's better to simply get the second meter for the EV charging plan from SCE.

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Last edited by yorkhung on Tue Sep 04, 2012 10:37 pm, edited 1 time in total.

smkettner
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Re: 30A Circuit Breaker tripped on Nissan Leaf

Tue Sep 04, 2012 10:05 pm

Well that will help but I think there is more on the circuit.
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EVDRIVER
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Re: 30A Circuit Breaker tripped on Nissan Leaf

Tue Sep 04, 2012 10:12 pm

A 60W light bulb draws .5 amps not to mention they do not run on 240V in the US. Your panel is not 100W it's 100A, possibly. Based on the very old black wire and the junction box I suggest you unplug the EVSE and increase your insurance coverage. I see multiple issues with your installation and the previous wiring. Before you burn down your house I suggest you unplug that and get someone qualified to inspect your entire garage if not your home. You have multiple hazards waiting to happen on that wall, looks like a classic fire hazard, I'm not being sarcastic.

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redLEAF
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Re: 30A Circuit Breaker tripped on Nissan Leaf

Wed Sep 05, 2012 5:54 am

EVDRIVER wrote:Your panel is not 100W it's 100A, possibly. Based on the very old black wire and the junction box I suggest you unplug the EVSE and increase your insurance coverage. I see multiple issues with your installation and the previous wiring. Before you burn down your house I suggest you unplug that and get someone qualified to inspect your entire garage if not your home. You have multiple hazards waiting to happen on that wall, looks like a classic fire hazard, I'm not being sarcastic.
+1 -- looks more like you would see in a shed and not a garage, exposed junction box, romex instead of conduit, light gauge 'exposed' wires, etc., etc. -- unless you're the original homeowner, I'd be surprised that this stuff was overlooked in a simple home purchase inspection as it certainly would need to be upgraded properly. Depending on what you run on your 100A service (A/C, water heater, stove, dryer, etc.) you might be able to forego the upgrade to 200A but only say if your main electric use is minimal and the water heater, stove and dryer run on gas instead. When we moved into our house years ago we had a newer electric dryer with us but the former owner had a gas one and that was enough for us to need to upgrade to 200A so perhaps its time with the EVSE to have this done right; I'd certainly sleep better at night (you don't want to add to the controversy surrounding EV garage fires!) and it will increase the resale value of your house as well!
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PracticingHuman
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Re: 30A Circuit Breaker tripped on Nissan Leaf

Wed Sep 05, 2012 6:11 am

My understanding is that any EVSE installation is supposed to be run on its own circuit straight back to the main service panel...

The garage space in your photo reminds me of my former house. Detached garage of a 1925 house, Romex on a single circuit throughout the garage, no subpanel... just a buried wire back to the main in the basement (likely not even in conduit) with a primary shutoff switch in between.

If your setup is similar it won't be cheap having it done right, but it will be cheaper than anything you have to replace in a fire, including your house. The way insurance companies work, they would love to have any reason not to cover. However, it would be awful if it came to that in any case.
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EVDRIVER
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Re: 30A Circuit Breaker tripped on Nissan Leaf

Wed Sep 05, 2012 6:21 am

Yes, dedicated circuit in conduit as the wals are open, no Romex. You can see some conduit there. Since the house is 120 I don't see how other devices are tripping but my guess is it is wired wrong and only getting 120V or sharing other wires.

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LEAFer
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Re: 30A Circuit Breaker tripped on Nissan Leaf

Wed Sep 05, 2012 8:45 am

yorkhung wrote:I think the suspect is the Water Heater Controller, if it draws max 9A, it would trip the circuit as Leaf 16A + 9A = 25A.
30A circuit breaker will only allow max current of 24A for continuous usage.
The second sentence is incorrect. You are clearly in a "learning" stage. Nothing wrong with that, except that you have crucial facts wrong. I am not trying to be de-structively critical here, but I must point out (again) that you need a licensed electrician. And that's my constructive criticism. Listen to everyone here that have already pointed this out multiple times.

(The 80% rule (24A out of 30A) has to do with NEC 625 which applies to EVSEs. (It's actually a 125% rule: the rating of the service (wire and breaker) must be 125% of the maximum continuous (defined as 3+ hours) current expected.) This is not a "breaker" rule. The breaker will *NOT* "allow" or "trip" at 24A because it predicts a 30A continuous draw. The breaker does not know what is attached to it.)
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Re: 30A Circuit Breaker tripped on Nissan Leaf

Wed Sep 05, 2012 9:14 am

EVDRIVER wrote:Before you burn down your house I suggest you unplug that and get someone qualified to inspect your entire garage if not your home. You have multiple hazards waiting to happen on that wall, looks like a classic fire hazard, I'm not being sarcastic.
This is very good advice. Hopefully it will be taken to heart.

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EVDRIVER
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Re: 30A Circuit Breaker tripped on Nissan Leaf

Wed Sep 05, 2012 9:23 am

I will be a bit more blunt. Everything about that wall is a hazard even if the wires were connected properly which is highly unlikely based on your comments. You need to hire a qualified electrician and you should not use that EVSE as it is connected now. You need a dedicated conduit to an outlet with everything secured and grounded properly. In addition your other wiring is a complete hazard so get it all checked and fixed.

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