IHD data and smart meter data correspondence

Reed_Richards

I have just found that I cannot download any half hourly smart meter readings beyond 8 am on 20th July. I had a similar problem for 11 days in March 2024 and that missing data was never recovered.  As before, the WAN and HAN lights flash every 5 seconds so there is no indication of a communication problem  

This time I switched on my IHD, which had been off for several months, to see what it knew.  It can tell me my hourly electricity consumption for today, my daily consumption since Thursday 21st July, weekly for up to 5 weeks ago and monthly for every month back to July 2024.

My question is whether my IHD derives this information from "doing sums" on the stored half-hourly data or whether the data it needs to report to the IHD is stored separately.  If it is the former that means that the half hourly data is being "remembered" even though it hasn't been downloaded to the DCC for some reason.            

Scot_39

I've always assumed thats just read from the meter itself and its requirement to store historical totals

Say for electric, from

https://assets.publishing.service.gov.uk/media/5a796c9e40f0b642860d7fa9/smart_meters_equipment_technical_spec_version_2.pdf

5.6.4.11 Cumulative and Historical Value Store

A store capable of holding the following values:

i. nine Days of Consumption comprising the current Day and the prior eight 

Days, in kWh and Currency Units;

ii. six Weeks of Consumption comprising the current Week and the prior five 

Weeks, in kWh and Currency Units; and

iii. fourteen months of Consumption comprising the current month and the prior 

thirteen months, in kWh and Currency Units.


But could ve completely wrong.

My ihd actually goes wrong between midnight and 1 am dst on the appropriate times on my ihd, so daily looks a day out etc until just after 1am.


As meters iirc always store and timestamp using utc gmt afaik

Not sure if thats the meter or tge ihd misinterpreting it though.