GlennD
Forum Supporter
Posts: 1098
Joined: Sun Dec 18, 2011 7:14 pm
Delivery Date: 20 Jul 2013
Leaf Number: 410357
Location: Anaheim

Re: Charger Faults on 2 Different L2 Chargers

Tue Jan 10, 2017 8:35 pm

This is harder. Measure the voltage from the circuit breaker buss to the breaker output. For both buss's it should be near zero. If it is good then measure the garage panel. If you find a fault it may be the interconnecting cable. Hopefully the cable is good with no splices. Somewhere you have a problem. If you are very lucky it will be in the panels not the buried cable. A digital meter samples the voltage.I The two phases ( not really ) must be about the same. If one side is erratic then that is the problem. Unlike an analog meter a digital one periodically samples the voltage . That may disguise. the problem.
2012 Cayenne Red SL traded for:
2013 Pearl White SL Premium
Traded for a Cirrus White 2014 Mercedes B (totaled)
2016 Urano Gray eGolf SEL w/ drive assist

GlennD
Forum Supporter
Posts: 1098
Joined: Sun Dec 18, 2011 7:14 pm
Delivery Date: 20 Jul 2013
Leaf Number: 410357
Location: Anaheim

Re: Charger Faults on 2 Different L2 Chargers

Tue Jan 10, 2017 8:37 pm

This is harder. Measure the voltage from the circuit breaker buss to the breaker output. For both buss's it should be near zero. If it is good then measure the garage panel. If you find a fault it may be the interconnecting cable. Hopefully the cable is good with no splices. Somewhere you have a problem. If you are very lucky it will be in the panels not the buried cable. A digital meter samples the voltage. Ihe two phases ( not really ) must be about the same. If one side is erratic then that is the problem. Unlike an analog meter a digital one periodically samples the voltage . That may disguise. the problem.
2012 Cayenne Red SL traded for:
2013 Pearl White SL Premium
Traded for a Cirrus White 2014 Mercedes B (totaled)
2016 Urano Gray eGolf SEL w/ drive assist

GerryAZ
Gold Member
Posts: 1035
Joined: Mon Nov 22, 2010 6:47 pm
Delivery Date: 12 Jun 2011
Location: Phoenix, AZ

Re: Charger Faults on 2 Different L2 Chargers

Wed Jan 11, 2017 8:43 pm

This is hard to explain in a few words, but I will try. I am concerned that the bare neutral conductor is acting like a neutral grounding electrode for the whole house and seeing fluctuating current to ground caused by changing loads in the house. Since the EVSE checks for a safety ground connection by injecting a small current from line to ground, fluctuating current in the bare conductor might cause the EVSE to shutdown. This would be less likely to affect the 120-volt EVSE because the ground sense current is from only one line to ground and the 12 amperes of continuous return (neutral) current on the bare conductor would tend to dampen the fluctuations. I have seen severe unbalance between the two 120-volt lines and damage to metal water pipes from inappropriate ground currents caused by loose or inadequate neutral and ground connections. As others have already noted, the feeder to the garage should have 3 insulated conductors (L1, L2, N) and a dedicated ground conductor.

Gerry
Gerry
Silver LEAF 2011 SL rear ended (totaled) by in-attentive driver 1/4/2015 at 50,422 miles
Silver LEAF 2015 SL purchased 2/7/2015

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