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MSE_Jenny

keith_r59 wrote: »

I don't understand where you get this £70/year saving on your energy bill figure. When I use the Cashback Calculator on the Energy Saving Trust website the figure returned for a 3.96 kWp system installed in the Midlands with 50% exported comes out as £215 fuel bill savings per year.

Hi Keith

I got a reply from EST on this - hope that helps ...

"That calculation was literally changed yesterday and the whole functionality of the calculator needs to be tweaked a bit before the change can be incorporated. [FONT=&quot][/FONT]
[FONT=&quot] [/FONT]
"The system mentioned is also larger than average so would see significantly higher bill savings than £70 anyway. "[FONT=&quot][/FONT]

Cardew

keith_r59 wrote: »

I don't understand where you get this £70/year saving on your energy bill figure. When I use the Cashback Calculator on the Energy Saving Trust website the figure returned for a 3.96 kWp system installed in the Midlands with 50% exported comes out as £215 fuel bill savings per year.

In the light of tests, EST are now saying that typically people will export far more than 50% and hence use less in the house.

celerity

keith_r59 wrote: »

I don't understand where you get this £70/year saving on your energy bill figure. When I use the Cashback Calculator on the Energy Saving Trust website the figure returned for a 3.96 kWp system installed in the Midlands with 50% exported comes out as £215 fuel bill savings per year.

IMHO that calculator needs an extra question to clearly separate exported electricity from used energy. Lots of people will be on a deemed export rate of 50%, but there needs to be a question to help estimate the daytime usage, and therefore energy bill savings.

Put another way, a couple with no children who work away from home will be saving relatively nothing during the day (just enough to run their fridge-freezer and a few appliances on standby). Whereas a partner who stays at home, sitting their toddlers in front of a 50" plasma screen all day, whilst frequently running the dishwasher, "stay warm" kettle, washing machine and toaster could save quite a bit.

/\dam

zeupater

Cardew wrote: »

In the light of tests, EST are now saying that typically people will export far more than 50% and hence use less in the house.

Hi

Agree, that's what a number of posters with systems maintain .... the larger the system, the higher the percentage of generated energy is exported ......

As an aside, I am quite interested in the feedback from the EST which Jenny quoted regarding a 3.96kWp system .... "The system mentioned is also larger than average so would see significantly higher bill savings than £70 anyway. " .... the word 'significantly' really surprises me as it is is so obviously wrong. At the moment my system is generating 2.2kW and the house is consuming 0.36kW and upsizing the system by any multiplier would not effect the usage, just the proportion exported .... perhaps the EST would like to reconsider their answer to Jenny .....

HTH
Z

keith_r59

MSE_Jenny wrote: »

Hi Keith

I got a reply from EST on this - hope that helps ...

"That calculation was literally changed yesterday and the whole functionality of the calculator needs to be tweaked a bit before the change can be incorporated.

"The system mentioned is also larger than average so would see significantly higher bill savings than £70 anyway. "

Thank you for the quick reply Jenny.

I think your article would be a lot clearer if you quoted actual system sizes and the projected savings as per EST trial calculations. Using terms like 'typical', 'average' and '-ish' will only cause confusion

keith_r59

Cardew wrote: »

In the light of tests, EST are now saying that typically people will export far more than 50% and hence use less in the house.

Maybe EST could publish the results of their trial, and how the trial was conducted, otherwise we will still all be making assumptions.

mickyduck

celerity wrote: »

IMHO that calculator needs an extra question to clearly separate exported electricity from used energy. Lots of people will be on a deemed export rate of 50%, but there needs to be a question to help estimate the daytime usage, and therefore energy bill savings.

Put another way, a couple with no children who work away from home will be saving relatively nothing during the day (just enough to run their fridge-freezer and a few appliances on standby). Whereas a partner who stays at home, sitting their toddlers in front of a 50" plasma screen all day, whilst frequently running the dishwasher, "stay warm" kettle, washing machine and toaster could save quite a bit.

/\dam

I am awaiting the install of my system and have to agree that I will probably save very little from my electricity bill... I work away a lot and being a Yorkshire man am VERY frugal even when at home. Daily usage will be as stated Fridge, Freezer, Vbox.... occasional dishwasher and washing machine. I would be much happier for a real measure of the electric exported refunded rather than the notional 50 50.
Still hoping that in 10 years time I am a happy bunny

Cardew

mickyduck wrote: »

I am awaiting the install of my system and have to agree that I will probably save very little from my electricity bill... I work away a lot and being a Yorkshire man am VERY frugal even when at home. Daily usage will be as stated Fridge, Freezer, Vbox.... occasional dishwasher and washing machine. I would be much happier for a real measure of the electric exported refunded rather than the notional 50 50.
Still hoping that in 10 years time I am a happy bunny

I thought you could claim for 'actual' exported electricity, provided you had an approved export meter?? - and with the coming introduction of smart metering|? Certainly it was possible with the pre-FIT PV systems.

However as you only get 3.1p per kWh exported it is not going to be a huge amount extra.

e.g. if you have a 4kWp system and generate say 3,500kWh pa, you get for 50% notional export £52.50. If you exported 80% you would get £84.

Cardew

zeupater wrote: »

Hi

Agree, that's what a number of posters with systems maintain .... the larger the system, the higher the percentage of generated energy is exported ......

As an aside, I am quite interested in the feedback from the EST which Jenny quoted regarding a 3.96kWp system .... "The system mentioned is also larger than average so would see significantly higher bill savings than £70 anyway. " .... the word 'significantly' really surprises me as it is is so obviously wrong. At the moment my system is generating 2.2kW and the house is consuming 0.36kW and upsizing the system by any multiplier would not effect the usage, just the proportion exported .... perhaps the EST would like to reconsider their answer to Jenny .....

HTH
Z

Agreed, even a 1kWp system would provide all of your 360 watts.

K4blades

Cardew wrote: »

I really wonder why some people are so intent on exaggerating the likely savings from 'rent a roof' PV systems.
'calculation is done using software' indeed! :rotfl:

Not exaggerating, just collecting data from as many possible and varied sources as possible, instead of assuming that I'm right about everything and that everyone else must agree with me.

The EST article also states that with bigger systems, there could be "significantly bigger" savings.
In the past Cardew, you have been very quick to dismiss anything EST say, but you seem very good at selective quoting.

PS, I'm still waiting for you to provide evidence that with PVs "there will be lots of days when you generate no electricty".......garbage indeed.