With some reluctance, I have just had a new Smart Meter installed. I did so after assurances that I would retain control over the day/night changeover time and the economy 7 tariff options, and because EDF offers a particularly attractive tariff with a very low off peak rate if one agrees to have a Smart Meter fitted. We have owned a Model S for 4 years and had a Powerwall 2 installed 3 months ago. This is working well and last month we only used 20kWh of peak rate energy at the high EDF rate of 24.69p/kWh. The night rate is 4.9p/kWh on our new tariff, which requires a Smart Meter to be fitted.
The new meter was installed 2 days ago and I immediately detected a problem. With the old meter, the Peak rate digits never budged even 10W from day to day unless the Powerwall ran out of charge. Now I have an apparent constant grid consumption of just under 100W. This is only obvious because I know the consumption should be zero. It doesn't sound much but it amounts to over £150 per year! You might note that 100W over the 17 hour Peak rate period = 50kWh per month - 2.5 times my current consumption! During the 7 hour night period the cost would be fairly insignificant and it would be very difficult to detect as the Model S and the Powerwall charge during this time.
I am currently in discussion with EDF about it. We are going to give it a couple of weeks so that they can get a reasonable period of half hourly readings to analyse. Watch this space!
If it wasn't' for the presence of the Powerwall it's unlikely that I would have noticed anything for some time. There would just have been a slightly suspicious increase in the energy consumption and cost over a period of several months or a year, if one monitors these things, which I do but a lot of people don't. There have been studies which indicate that Smart Meters can over-read by a significant amount, e.g. http://www.yougen.co.uk/blog-entry/2953/Are+smart+meters+overcharging'3F/
This suggests that the electricity companies may be getting an unexpected windfall from the installation of Smart Meters. Of course I'm not suspicious enough to imagine that it's deliberate...
The new meter was installed 2 days ago and I immediately detected a problem. With the old meter, the Peak rate digits never budged even 10W from day to day unless the Powerwall ran out of charge. Now I have an apparent constant grid consumption of just under 100W. This is only obvious because I know the consumption should be zero. It doesn't sound much but it amounts to over £150 per year! You might note that 100W over the 17 hour Peak rate period = 50kWh per month - 2.5 times my current consumption! During the 7 hour night period the cost would be fairly insignificant and it would be very difficult to detect as the Model S and the Powerwall charge during this time.
I am currently in discussion with EDF about it. We are going to give it a couple of weeks so that they can get a reasonable period of half hourly readings to analyse. Watch this space!
If it wasn't' for the presence of the Powerwall it's unlikely that I would have noticed anything for some time. There would just have been a slightly suspicious increase in the energy consumption and cost over a period of several months or a year, if one monitors these things, which I do but a lot of people don't. There have been studies which indicate that Smart Meters can over-read by a significant amount, e.g. http://www.yougen.co.uk/blog-entry/2953/Are+smart+meters+overcharging'3F/
This suggests that the electricity companies may be getting an unexpected windfall from the installation of Smart Meters. Of course I'm not suspicious enough to imagine that it's deliberate...