[Terry61]

I'll try and explain this the best I can.
Each time I top up my meter I:-
Take a meter reading
Record the credit I have prior to my top up and after I have topped up.
I then have a spreadsheet set up to calculate my final reading at my next top up.
This gives me how many units I have used, which I multiply by the cost per unit (inc. VAT).
I multiply the days involved by the standing charge (inc. VAT)
I add the unit value to the standing charge and take the total away from the amount of credit that was on the meter.
This gives me a running total of how much I should have left on my meter.

All quite simple.

But... why when I check the meter is there on average £6 less than there should be.

I have been through my meter to check the unit price and standing charge are correct and they are.
I have no debt to be paid back and very very rarely use the emergency credit.
I just can't fathom it out.

I tried messaging Eon next but after their initial 'we need your name, address, account number', which I supplied over 2 hours ago, I have had no reply.

I can give the readings if someone wants to check my figures.

[retrotecchie]

@Terry61

Assume 10.55 for conversion factor for now. That will be close enough.

41 cubic metres x 10.55 = 433kWh, roughly, so cost of gas is approximately £45.89. £4.50 for Standing Charge works out at bill of roughly £50.39.


From £69.99 credit, that leaves you with £19.60

But, I haven't adjusted for volumetric conversion factor which will add about 3% onto the gas cost, so if we allow that it makes the gas about £47.26 thus actually leaving you with nearer £17. The meter will also be using decimals internally for calculations, even though you usually ignore them for sending manual readings, so I would say the £16 left on your credit is pretty spot on.

If you were expecting £22 but seeing £16, there's your 'missing' £6. 25p on the standing charge as you need to round up to integer days, about £4 to 5 out on your calculations and the fact the meter IS using the decimals of the cubic metres internally

[retrotecchie]

@Terry61

Happy to check your figures if you want to post them here or send them to me in a private message. The office closed a couple of hours ago so I wouldn't expect a subsequent reply to your message until tomorrow at the earliest.

Can you check your meter's debt register just to make sure it says zero?

[Terry61]

@retrotecchie

Have sent to a PM. Have checked all the meters readings and no debt showing. There shouldn't be anyway as I owe nothing.

[retrotecchie]

Ok, this is an electric meter, yes?

Because unless you are giving me just your Economy 7 night rate usage, your electricity tariff is wrong.

If you have E7, you're missing off your daytime usage, which may not be much but would explain the missing £6 odd.

[Terry61]

No this is a gas prepayment meter.

Gas

Standard PAYG
10.62 p/kWh 37.51 p/day(All rates inc. VAT)

[retrotecchie]

@Terry61

Thank you for clarifying that. The unit price looked like E7 off peak rate to me!

Bear with....

[retrotecchie]

@Terry61

Ok, if those meter readings are cubic metres, what are you using as your conversion factors to kWh. As in, calorific value and compensation factor. Your standing charge cost is wrong...you need to round up to the nearest integer for days, i.e. 12

[Terry61]

I'll take a look at the meter again.

[Terry61]

Right that could be where the problem with my calculations lie.

It is in cubic meters.

I have no idea what the calorific value is, it doesn't show anywhere on my meter and I've never been told. The last bill I had from Eon next was 26 Feb 2021 when I was switched over from N-power.

How do I find the calorific value ?