Overvoltage on domestics

[pete433]

Have any of you had issues with slight peaks in voltage over 253V tripping inverters, I called sma and they said they are recieving 10 calls a day about inverter parameters to combat this.

Has anyone thought about using a voltage smoothing device at the incomer i have seen these on the market they smooth the voltage to 230V.

 

[Markc]

Got one at the moment. Started on the 9th July according to the event log on the inverter.

DNO are now monitoring the voltage to the property as it is end of line and has its own regulator. Have to say for UK Power networks they couldn't help enough!

Awaiting outcome form the monitor before looking into alternative devices such as the V phase units.

 

[pete433]

I think this is a growing problem by the sound of it, the v phase kit would this potentially resolve the problem?

I believe they are about £300.

 

[BruceB]

I doubt V Phase is designed to have power going through it in the reverse direction, but look forward to being corrected.
Regards
Bruce

 

[mmorse60]

From what i remember of the V-phase wiring documents for PV, the PV circuit would not go through the unit and so would not have a steady voltage

 

[SolarCity]

If the voltage goes over 253v, isn't the DNO obliged to correct it?

 

[TedM]

V-Phase has to be kept separate from microgeneration circuits. At least it was the last time I looked at the detailed specs.

 

[pete433]

maybe v phase will not solve the issue, the dno is the next step. Does anyone know the settings for a sunnyboy 3000tl for the uk, do we set the rotary switches??

 

[Graeme Harrold]

Rotary switches as per the install instructions to set G83....

 

[JD6400]

If the voltage goes over 253v, isn't the DNO obliged to correct it?

Hi BiggsSolar
Yes they do , but they also have a loverly little caviat in their obligations that means they can pretty much do what they like for 5% of the time .
Which equates to near on one and a quarter hours a day with no power at all if they so wished !
Now we all know this would never really happen , but it does mean that they have got a bloody big get out clause when they want if you approach them wrong !

 

[Mark.W]

We've had this problem a couple of times, you have to set the SMA parameters to UK and G83. If you take the front cover off the inverter, you will see 3 dials. The left one needs to be set to 5 and the middle one set to 8. If you don't set this pre-installation and the inverter re-sets more than 10 times ie. first thing in the morning etc. you cannot manually change the settings. You then have to reprogram the inverter with your laptop. Contact SMA for details