EV charger issues
Discussion
We have an Eon supplied Vestel EVC04 charger.
If I set the charge schedule on the Eon app for cheap rate the charger will sporadically go into fault mode (red light on unit) and I have to reset at the RCD.
Eon support have logged into it remotely and said it shows a "over voltage" error. Upper limit is 253V
The fault happens more overnight and generally okay if I set it to manually charge.
The home battery system we have shows mains input to house to be around 250V.
I've isolated the battery/inverter to check it wasn't causing the mains to be higher.
Having an old mans bladder, I got up in the early hours and checked if the EV was charging... red fault light!
I manually reset and started to charge the car.
The mains display was flickering between 250-253V, once the charging started it was 245V
Eon said I have to get National grid to fit a monitor to the house supply for a week, National grid say Eon have to look at it (National grid guy said most of the calls to their support line are for this!)
I can't see on any install documents a way to change this voltage limit. Charger datasheet states 230V +/-10%
Anyone else had similar issues?
If I set the charge schedule on the Eon app for cheap rate the charger will sporadically go into fault mode (red light on unit) and I have to reset at the RCD.
Eon support have logged into it remotely and said it shows a "over voltage" error. Upper limit is 253V
The fault happens more overnight and generally okay if I set it to manually charge.
The home battery system we have shows mains input to house to be around 250V.
I've isolated the battery/inverter to check it wasn't causing the mains to be higher.
Having an old mans bladder, I got up in the early hours and checked if the EV was charging... red fault light!
I manually reset and started to charge the car.
The mains display was flickering between 250-253V, once the charging started it was 245V
Eon said I have to get National grid to fit a monitor to the house supply for a week, National grid say Eon have to look at it (National grid guy said most of the calls to their support line are for this!)
I can't see on any install documents a way to change this voltage limit. Charger datasheet states 230V +/-10%
Anyone else had similar issues?
This is quite a common problem and the charger input voltage level probably can't be adjusted easily if at all.
My neighbour was on to the local DNO for months about his Tesla Charger and I think they eventually agreed to turn down the local step down transformer a notch..
What might help the OP in the meantime is if you turn on some mega appliances 3kw kettle, tumble dryer or electric shower in the house just before the charge is programmed to start.
This might load down your house main feed enough to drop the voltage seen by the charger to under it's cut off/error level.
Once the charger is running, the load ~7kw it applies itself might keep the voltage under the error level, so you can switch off your other appliance.
At night in your locality as the load is shed from people on your circuit who don't have EV's going to bed etc the line voltage will tend to creep up.
My neighbour was on to the local DNO for months about his Tesla Charger and I think they eventually agreed to turn down the local step down transformer a notch..
What might help the OP in the meantime is if you turn on some mega appliances 3kw kettle, tumble dryer or electric shower in the house just before the charge is programmed to start.
This might load down your house main feed enough to drop the voltage seen by the charger to under it's cut off/error level.
Once the charger is running, the load ~7kw it applies itself might keep the voltage under the error level, so you can switch off your other appliance.
At night in your locality as the load is shed from people on your circuit who don't have EV's going to bed etc the line voltage will tend to creep up.
It's common for mains voltage to fluctuate slightly as demand changes so if you're close to the 253 volt limit during the day, I'm not surprised it's sometimes going out of spec overnight.
Since your contract is with EON, I'd have thought it's their responsibility to make sure you get delivered a product which is within spec. Even though it's ultimately the national grid (well the local DNO) who will control the voltage. It might be worth contacting the DNO directly though.
Since your contract is with EON, I'd have thought it's their responsibility to make sure you get delivered a product which is within spec. Even though it's ultimately the national grid (well the local DNO) who will control the voltage. It might be worth contacting the DNO directly though.
Edited by kambites on Thursday 9th January 16:14
Had exactly this issue. Turned out to be a faulty local transformer that was eventually fixed by the DNO. You can't change the upper voltage fault limit on the charger as its a mandated limit for EVSE's. The SyncEv help desk did raise the limit temporarily to get me through the issue but it still occurred occasionally. The supply was hitting 257v, usually in the early hours of Sunday morning.
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