How do I confirm Economy 10 hours and rates?

I may be missing something as I am new here but the OP says rate 1 is peak but rate 1 appears to cover times that look like off peak?

 ​@h4X0R Thanks again. 
    

I’m sorry, but I have no experience of what I think is called ‘wet electrical heating’, where an electric boiler takes the place of the more usual gas boiler. Regardless, if the heater for domestic hot water (DHW) - i.e. that used for other purposes than space heating via radiators - is separate from the boiler, it should only be heating up inside offpeak hours. 
  

Again, I’m not familiar with L&G meters, but it could be that it works slightly differently from what I’m used to. You have shown a screen headed Rate 01 Act Imp. On my meter, the equivalent screen only gives the current meter reading for the peak register. It doesn’t tell me which register is the one in use. This probably leads to confusion because of the different meanings of Active in this context. However, I can’t determine from the L&G manual how otherwise to see which rate is currently incrementing. If the screen changes at the same instant as the LED changes colour  and stays on the same rate until the next LED colour change, then I’d wonder how to read the other register …
     

Beware of any comparison between meter register readings and half-hourly usage data. For a multi-rate system - like your and mine - there will never be an exact equivalence. This is because the half-hours start on the dot of midnight and continue relentlessly throughout the day, while the meter registers follow their own timetable which is a few minutes different. 

Good.

I still can’t work out which of the two timetables is the right one if the tariff is changing at 2 minutes past the hour, while the ALCS is operating at 10 minutes past. I’m going to ask our meter guru if he could be very kind and look up your meter’s randomized offset - a number of seconds between 0 and 1800. ​@Lukepeniket_OVO - if you have a moment? There are helpful pics higher up. 

hi ​@Firedog 

just wanted to add a couple of clarifications:

I’m sorry, but I have no experience of what I think is called ‘wet electrical heating’, where an electric boiler takes the place of the more usual gas boiler. Regardless, if the heater for domestic hot water (DHW) - i.e. that used for other purposes than space heating via radiators - is separate from the boiler, it should only be heating up inside offpeak hours. 

The immersion heater is used for heating water only, shown on the left. The space heating via radiators is done by this item, shown on the right:

You have shown a screen headed Rate 01 Act Imp. On my meter, the equivalent screen only gives the current meter reading for the peak register. It doesn’t tell me which register is the one in use. 

As mentioned previously, the meter, by default, displays the register currently in use. That’s why i took photos of the meter at the beginning and end of each peak/off-peak period. That allowed me to verify that the register periods were operating inline with economy 10 off-peak periods:

12.00am - 5.00am 1.00pm - 4.00pm 8.00pm - 10.00pm (GMT)

If the screen changes at the same instant as the LED changes colour  and stays on the same rate until the next LED colour change, then I’d wonder how to read the other register

The screen does change (as per my meter reading photos above, right click and copy the picture and paste it in paint to get a much bigger view) from one rate to the other at the same time as the LED changes. 

Beware of any comparison between meter register readings and half-hourly usage data. For a multi-rate system - like your and mine - there will never be an exact equivalence.

You’re correct, they’re not exactly the same but they are close enough to let you differentiate between the two rates.

From my online account:

The off-peak reading between 7 Dec and 9 Dec is between 907 & 921 kWh

The peak reading between 7 Dec and 9 Dec is between 929 & 946 kWh

From my meter reading photos in my previous post:

on 8 Dec at 13:11 and 16:00, the meter is showing rate 02 with readings of 913 and 915 kWh.

Therefore rate 02 has to be the off-peak rate as they lie between 907 and 921 kWh.

On 8 Dec at 16:10 and 20.01, the meter is showing rate 01 with readings of 945 and 946 kWh.

Therefore rate 01 has to be the peak rate as they lie between 929 and 946 kWh.

Thanks again for all your help here ​@Firedog - we’re lucky to have your expertise on the Forum!

​@h4X0R I’ve reached out to my friend who’s an electrician. Hopefully between us we’ll get an explanation!

​@Firedog would the 10 minute delay not fall in line with the randomised offset, as detailed in this previous post?

OK, now I understand. Thank you! 

OK. I’m sorry I missed the little comment in the top corner of your earlier page of readings. Other meters I’ve come across don’t behave like that, and it causes untold confusion.
  

No, I wasn’t doubting that the register tiers were the right way round. If your randomized offset is only two minutes, then the difference in each offpeak period won’t be much. If it’s ten minutes, that could be significant. 

Let’s see whether our expert can shed some light on this.