Converting energy consumption into kWh/annum from new EU energy labels

Screwdriva

While shopping for a replacement Siemens A rated dishwasher, I found it quite difficult to compare energy consumption figures over my existing 5 year old Bosch unit, which has its consumption listed as 262 kWh per annum (vs. the new metholody of 54 kWh per 100 cycles). Thought it may prove useful to know how to convert the new metrics as below. 

(Using the below methodology, the Siemens consumes ~112 kWh per annum. That's a £50 savings per year at current tariffs!)


To convert the energy consumption from new EU energy labels into kWh/annum, the following guidance should be followed:

Dishwasher: multiply kWh/100 cycles figure on EU energy label by 2.08 to get kWh/annum

Washing machines and washer dryers: multiply kWh/100 cycles figure on EU energy label by 2.2 to get kWh/annum

Ovens: multiply kWh/cycle figure on EU energy label by 286 to get kWh/annum

EricMears

Surely,  if you're given kWh / 100 cycles but really wanted kWh per annum,  all you have to do is to divide kWh / 100 cycles  by 100 them multiply by the number of cycles you'd expect to use in a year.

The 'following guidance'  given above obviously uses that method but uses an average number of cycles/year  - i.e. their 'average dishwasher user' runs machine 208 times per year.

thevilla

But if you have PV generation what you really want to know is peak consumption.  Our 1kw kettle has easily paid for itself.  Not sure my wife would accept a 12 hour cycle of a 1kw dishwasher

Screwdriva

thevilla said:

But if you have PV generation what you really want to know is peak consumption.  Our 1kw kettle has easily paid for itself.  Not sure my wife would accept a 12 hour cycle of a 1kw dishwasher

Given that we export for roughly the same £ as we import, and did not spend thousands on a battery, the grid acts as our battery making peak draw largely irrelevant. It's all about overall efficiency i.e. using as little as possible for us. 

thevilla

Screwdriva said:

O f coursesaid:

But if you have PV generation what you really want to know is peak consumption.  Our 1kw kettle has easily paid for itself.  Not sure my wife would accept a 12 hour cycle of a 1kw dishwasher

Given that we export for roughly the same £ as we import, and did not spend thousands on a battery, the grid acts as our battery making peak draw largely irrelevant. It's all about overall efficiency i.e. using as little as possible for us. 

Screwdriva said:

thevilla said:

But if you have PV generation what you really want to know is peak consumption.  Our 1kw kettle has easily paid for itself.  Not sure my wife would accept a 12 hour cycle of a 1kw dishwasher

Given that we export for roughly the same £ as we import, and did not spend thousands on a battery, the grid acts as our battery making peak draw largely irrelevant. It's all about overall efficiency i.e. using as little as possible for us. 

Of course!  We're on FIT so it's worth our while to use as much as possible.  Makes perfect sense for you if you have a fair export price to do as you describe.  Tbh it's the better approach as you still have an incentive to recuce overall use.  We divert to hot water we don't necessarily need.

zeupater

Hi

My take is that kWh per cycle is more representative for any appliance that isn't on all the time (fridge etc) and don't really follow the reason for the labelling system ever being based on this ...

Above this, didn't anyone ever think that rating efficiency on a reverse basis wouldn't ever fall apart, let alone fall apart so quickly? ...

... the highly intellectual conversation must have been something along the lines of ... "so what's the best in the test, okay we'll call that an 'A' and measure everything else against that, good day's work; time for lunch everyone?" .... totally restrictive & incompetently backing themselves into a corner so much that when efficiencies improved the total energy performance banding for 'A' was likely greater than 'B' through to 'D' combined, becoming so meaningless they were forced into the A+ route, then as further efficiencies came along, A++, then A+++, A++++ .... it was all predictable from the beginning, but the consequences don't even stop there ...

Without any difference in energy consumption some ratings have been rebased, for example, what was an 'A++" lightbulb has been reevaluated & rescaled to be a "E" on the new efficiency labels ... yes, a consumer in not being aware of the changes, can pick up two competing products off the shelf, compare the efficiency labels and erroneously believe that an A+ rating on one is more efficient than an E on the other .... don't you just love it when politics & idiots combine forces to override common sense ...

HTH - Z