My usage doesn't add up can someone help me?

Here’s another random example, October 5th:

How does that add up to 8.69 kWh ? You can see that throughout all the day I was below .3kwh average, and if you do .3 x 24 you get 7.2 kWh… so max it should be is below 7.2 but no, I used 8.69??

I’m in my phone so haven't totaled them - but if you total each one rather than a guestinate then how does it look?

It may still be slightly different because the half hour figures shown are shown to 2 Decimal Places whereas the total uses the full 3 DPs that are available from the meter, and then still shows it to only  2 DP.

Is all one has to do simply add up all 48 values to get the total kWh used for that day? Or is it find average and then multiply by 24

You should not try to average them - just add them all up.

You’ve just discovered your solution .. each slot is for half an hour and there are 48 of them (not 24). There may be some discrepancy due to rounding. 
The maths does work

‘Way more’? I haven’t added up your figures, but  how big is the difference?

The usage data are largely for interest’s sake (although this will be changing from next year); charges are calculated solely from the actual meter readings.

There’s another factor: the single figure for the day’s consumption is the difference between meter readings from one day to the next. The half-hourly usage data may not be timed from precisely the moment the meter readings were taken, so their sum will not always match the meter advance precisely. That said, mine are always within .001kWh of each other if I use the underlying numbers with three decimal places.

Note, too, the BST fudge. The first two figures in the tables in fact belong at its bottom, because the underlying data and the meter readings are always based on GMT. The meter readings you see are taken at 01:00 local time. 

😄

I don’t think so (as I wrote earlier). The total figure on the Day tab, and the (same) figure on the Month tab, is simply the difference between meter readings. OK, they are also usually to three decimal places, and the meter simply calculates Reading 1 + 48 Hh figures to get Reading 2, giving rise to a possible difference of 1 in the least-significant digit.

You can see this occasionally if readings have turned up before usage data, which happens to me about half the time. On those days, the day total is shown on the usage pages even though the Day chart hasn’t yet been populated with Hh data. 

thanks everyone I get it now. 

Hi @cypherpunk1,

It seems our forum volunteers have already got to the bottom of this for you. Hope it was helpful.

Please let us know if you have any further questions.