UW, Econ 7 and Dimplex Quantum heater

lilac_dawn

Somewhere in the above combination there is a mismatch and I need someone to point me in the direction of what I can check please.

After a month with UW, I have my bill, readings day 303, night 128. This time last year day 76, night 409 - which is what I would expect.

I am now at home full-time compared to last year BUT last year I was only out for 3 mornings so I am not wholly convinced the day shoud have increased that much. The night would be for the one Quantum that is on at the moment plus the immersion that heats overnight. That hasn't changed from last year and I don't see that having much milder weather would affect it so much.

I have a smart meter and have checked that the readings in UW are in the correct place - they have put the start reading for the night in the night tarrif and the day in the day. So how come there is such a difference in usage...?

I feel like the Quantum is drawing on peak usage somehow but I have checked the times it charges and it matches with the off-peak times. The only thing I can think of is the checking the heat source: in the advanced menu, for boost it is storage only (rather than element plus storage). For heat source, timer it was selected as storage plus element so I have now changed it to storage only but I can't find too much online as to how this would alters things. I would have thought too that it would still take on max store so the night rate would be higher.
Can anyone help? My thinking is UW has billed day as night, but they have the readings the right way round on the bill so how is this possible?
Thanks for any help. 

QrizB

It sounds like a mismatch between the SH charge times and the meter rate change schedule.

Does your Quantum have dual supplies or only a single 24h supply? (You might have mentioned this in a previous thread but I'm on a dodgy mobile connection and can't easily check.)

lilac_dawn

It has a single 24 hour supply so I set the times on the Quantum. They are set correctly as I know the the times from EDF - have suffered Eco 7 for 20 years!

QrizB

Are you certain that UW haven't changed the times?

Does UW give access to your half-hourly usage data? If so, can you see the overnight hump from your SH charging on it?

Swipe

If you are sure your timer is set correctly, I'd double check your meter's ALCS calendar / E7 times haven't changed or gone out of sync with your tariff schedule. In fact, that is the first thing you should check when you switch suppliers on E7.

lilac_dawn

QrizB said:

Are you certain that UW haven't changed the times?

Does UW give access to your half-hourly usage data? If so, can you see the overnight hump from your SH charging on it?

They don't but I have the Bright app and can see the half hour slots there. I can see everything charging up when it should be. Or do you mean that UW has changed the Eco 7 times? I think not, as when I first switched I checked that the immersion switched on at the correct time, and it did. I didn't, of course, wait up and see the if it switched off at the correct time. 

lilac_dawn

Swipe said:

If you are sure your timer is set correctly, I'd double check your meter's ALCS calendar / E7 times haven't changed or gone out of sync with your tariff schedule. In fact, that is the first thing you should check when you switch suppliers on E7.

How do I go about this please? Other than calling UW. 

QrizB

lilac_dawn said:

Swipe said:

If you are sure your timer is set correctly, I'd double check your meter's ALCS calendar / E7 times haven't changed or gone out of sync with your tariff schedule. In fact, that is the first thing you should check when you switch suppliers on E7.

How do I go about this please? Other than calling UW. 

It's a little bit more work than you've already done.

lilac_dawn said:

... when I first switched I checked that the immersion switched on at the correct time, and it did. I didn't, of course, wait up and see the if it switched off at the correct time. 

Your meter will have some way of showing which register/tariff is active at the present time. If you can tell us the make and model we can probably find instructions.

Stay up to check the immersion heater again, and this time also check that the off-peak register is the active one.

Then check again, seven hours later, to make sure that the immersion heater turns off and the active register switches over.
If the registers are switching at the same time as the ALCS, and they're all switching at the same times that you've programmed into your Dimplex Quantum, and the Dimplex Quantum clock is correct, we might need to look elsewhre for the problem.

lilac_dawn

It's Edmi es12b

I have always had split times 22:30-00:30 then 02:30-07:30 for night rate. 
It was definitely switching on OK at 22:30 - at least I just checked the immersion had lit up. I didn't check the meter - it's outside - but somewhere I eventually found a video on how to read it and I thought I checked to see if the night had clocked up as it should the following day. Maybe the end of BST altered it? I alter my times to account for the clock change so again not usually a problem. 
I will have a search for the video again and go and investigate the meter. 

QrizB

lilac_dawn said:

Maybe the end of BST altered it? I alter my times to account for the clock change so again not usually a problem. 

What exactly do you mean by this?

Economy 7 hours don't usually change; they're GMT all year round.

The common split is 1130 to 0130 and 0330am to 0830am, GMT - so appears to be 1030-0030 and 0230-0730 during BST.

EDIT: That was back-to-front, see below.

lilac_dawn

QrizB said:

lilac_dawn said:

Maybe the end of BST altered it? I alter my times to account for the clock change so again not usually a problem. 

What exactly do you mean by this?

Economy 7 hours don't usually change; they're GMT all year round.

The common split is 1130 to 0130 and 0330am to 0830am, GMT - so appears to be 1030-0030 and 0230-0730 during BST.

No, usually the other way round. In winter, 10:30-00:30 etc.