Monday 27 February 2012

When is this party?

Ok - so it's winter and its been windy and I mustn't get carried away and staring at spreadsheets will make you go blind and all that. BUT - the purple area is the required output to meet our party date - the blue bit shows how much the turbine is over-performing. At this rate the party will be March 28 2016. But don't change yer plans just yet.... it gets less windy in summer so that blue bit should shrink. But then again the turbine was switched off for 14 hours this week.

I promise not to do another graph until the month is out!

Actually - I've just realised that I need to re-do the graph as 'actual income' vs 'projected income' cos 'income' is not a direct conversion of power output cos 'income' is higher for the first roughly 21kWh of energy generated. Oh god I guess I'd better explain this.

Based on the amassed evidence of one electricity bill, our house uses about 21kWh per day. For those first 21 kWh I've allowed an additional 'income' of 11.66p pkWh. Of course this isn't really income - it's non-expenditure - but it has the same bottom line effect as income.

If I'd paid more attention at school maths when we did this stuff - rather than daring each other to climb out of the window when teacher wasn't looking (I did very well at this - but was beaten by a pal who managed to climb out of our window and in through the window of another classroom (while a class was on in there too), steal a fire extinguisher, climb out of the window and then walk in through the door of our class and announcing to the teacher that he was checking that all classrooms had a fire extinguisher and sitting down again. Teacher looked perplexed but couldn't work out what had happened - if I'd paid more attention I'd be able to confidently express this as a formula. Instead I'll have to make it up:

income = total energy generated x FiTs + (total power generated/2) x export tariff + 21 kWh x 11.66

So there.

Anyway - revised graph may follow - only i'm losing the will to live - how about you?

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