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Nubo
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Re: AV EVSE ... not silent anymore

Sat Jan 15, 2011 1:16 pm

gudy wrote:



Just kidding. But you will notice the sound is similar -- 60Hz, the normal frequency of AC current.
I noticed you're still working with polymers.

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garygid
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Re: AV EVSE ... not silent anymore

Sat Jan 15, 2011 3:52 pm

What did AV say when you described the "change" to them?
See SOC/GID-Meter and CAN-Do Info
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LEAFer
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Re: AV EVSE ... not silent anymore

Wed Jan 26, 2011 8:44 pm

bump.

Gudy: what happened on this issue ?
2011 Silver SL+QC [Mfg: 11/2010] 36mo/15k LEASE
06Jun2013 Status [28.5 months][34,173 miles][11 bars]
Lost CapacityBar 6/6/13 @34,173 miles while in LEAF Battery Monitor: 83.41%, 71.4F (avg); cool overnight;

gudy
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Re: AV EVSE ... not silent anymore

Sun Jan 30, 2011 9:27 am

The noise went down since.
I got a follow up call from AV to re-assure me that the noise was not a sign of a problem, and could happen during normal operation.
We agreed that if it wasn't getting worse we would leave it at that, but they offered to send someone over (at their charge) if I really wanted.
This last week, The unit has been completely silent.
Also he said that when I hear the noise, I should try tapping on the unit and see if that makes the noise go away.
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DaveinOlyWA
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Re: AV EVSE ... not silent anymore

Sun Jan 30, 2011 9:30 am

Oh could it be powerline noise amplified then?
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Re: AV EVSE ... not silent anymore

Sun Jan 30, 2011 9:39 am

gudy wrote:Also he said that when I hear the noise, I should try tapping on the unit and see if that makes the noise go away.
Hmmm ... the old Television Trick, eh ? :roll:
2011 Silver SL+QC [Mfg: 11/2010] 36mo/15k LEASE
06Jun2013 Status [28.5 months][34,173 miles][11 bars]
Lost CapacityBar 6/6/13 @34,173 miles while in LEAF Battery Monitor: 83.41%, 71.4F (avg); cool overnight;

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garygid
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Re: AV EVSE ... not silent anymore

Sun Jan 30, 2011 10:04 am

Probably 120 Hz noise from the power supply transformer that is mounted on the large circuit board (that is mounted right behind the front face of the EVSE). If so, you should always hear it (when the EVSE has power) by putting your ear right up against the front of the EVSE.

Assuming it is the transformer hum, some mechanical coupling between the circuit board and the front face probably causes the front face to act as a "drum", resonating and amplifying the "hum".

Strange that the noise would be intermittent unless you are occasionally flexing the front cover, by touching or pressing it, or by pressing a button.

Perhaps one of the heavy e-hose wires connected inside was "squashed" back inside when the front face was mounted, so a little flexing of the e-hose causes that "strong" wire to press harder against the backside of the circuit board, flexing it toward the front-face "drum".

Wiggle the e-hose near its connection point to the EVSE and see if you can make the "loud" noise come and go.

The louder noise would annoy me, so I would have to "fix" it.
See SOC/GID-Meter and CAN-Do Info
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2011 LEAF, sold in 2015
2018 Tesla Model 3
2014 Tesla S, Model 3 in 2019
PU: SDG&E
Solar PV: 33 x 225W -> 7 kW max AC
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Nubo
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Re: AV EVSE ... not silent anymore

Tue Feb 01, 2011 10:28 pm

more info:

http://en.wikipedia.org/wiki/Mains_hum

Particularly fascinating is the forensics aspect
I noticed you're still working with polymers.

bowthom
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Re: AV EVSE ... not silent anymore

Sat Feb 05, 2011 10:39 am

Hello,
Don't have a Leaf to plug my evse into BUT, that sounds like the contactor to me. It probably reacts thermally in how the plate is held to the electromagnet pole. As it is expanding / contracting the hinged side is being held with a slight gap causing the buzz. It will change with wear of the pivot and temperature. Just guessing of course. ;)
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garygid
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Re: AV EVSE ... not silent anymore

Sat Feb 05, 2011 5:02 pm

Is the sound still there?
Only when charging, or whenever the EVSE has power?
See SOC/GID-Meter and CAN-Do Info
2010 Prius, now for sale
2011 LEAF, sold in 2015
2018 Tesla Model 3
2014 Tesla S, Model 3 in 2019
PU: SDG&E
Solar PV: 33 x 225W -> 7 kW max AC
To Sell: X-treme 5000Li EV motorcycle

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