Renewables: "talking 'bout my generation"

legoman62

15.02kWh yesterday.
Just past the halfway point of the month
and have made over 220kWh so far.

shafeeq

Oscargrouch wrote: »

Bummer; you beat me ! :rotfl: Where has Sheffield gone?;)

Not today, plenty of clouds and rain today 2.90kwh.

Oscargrouch

shafeeq wrote: »

Not today, plenty of clouds and rain today 2.90kwh.

Not very good here either, 5.8 kWh. 2.07 less than Avg. PVGIS for August. :eek: Best part of the saga is that my avg. for the month, to date is 9.68kWh per day.:T :rotfl:

KevinG

Quite a nice day here, 8.37kWh, well ahead of PVGIS.

legoman62

9.49kWh today. Sun and showers here.

EricMears

For once, weather forecast wasn't too bad.

6.9kWh today

jkpaul

sly_dog_jonah wrote: »

The cost of them sending the technician out to take the 'forensic' reading is probably way more than the amount being disputed, so I can understand OVO dragging their heels.

Yes, but what seems crazy to me is that as someone will have to come out ANYWAY, presumably a relatively competent technical engineer (to remove old meter, install new, check all is working & compatible with existing generation meter / Solar PV export etc.) then the question is surely how much MORE would it cost to do that AND at the same time to interrogate the existing meter for the accurate import / export figures?

My guess is not that much more!

It just seems so frustrating, without thousands of Solar PV systems up & down the country without an exact knowledge of how much they are exporting. Mine is one of the few where the accurate figure is accessible and needed, but they won't consider trying to get it!

:wall:

KevinG

That's more like it, 11.29kWh, sunny nearly all day, very warm.

Oscargrouch

sly_dog_jonah wrote: »

I'm glad my GCSE Maths came in useful, and that no-one else has picked it apart.

13.3 kWh today:T 93.2% of SAP forecast todate. :T 12.39% ROI so far...:T But haven't got my original cash available.:eek:

Over to sly_dog-- What is the best formula for working out the true ROI bearing in mind that I have not got the original Capital available ?
OK, it should be back within 6.5 years, (slate cleared) but in 6.5 years it would have earned something on its own (however small in comparison). Over to you Einstein. :rotfl:

Martyn1981

Hiya Oscar, there are a few ways to calculate it. The more info you put in the more accurate it will get with each step.

I knocked up a quick Excell doc a while back just to run numbers, this was based on a £7,000 install, generating £757 in yr1 and was at pre August rates.

Simplest calculation, allowing a 3% inflation upgrade gave a payback of approx. 8 years £6,731.50.

Allowing the £7k to be compounded at 4.6%, meant that the sum of the growing PV returns, and the growing investment ‘alternative’ met at year 14 with savings growing to £13,138.37 and PV income totalling £ 12,934.35.

But to be more accurate and fair, you also have to re-invest the PV income and savings each year at the same rate. Now the cash savings and the PV income (re-invested and growing) meet at year 10 with savings growing to £10,975.26 and PV income re-invested growing to £10,596.97.

If you want to keep going, then you would degrade the PV income by approx. 0.5% each year to account for panel degradation, and also allow for an inverter failure somewhere in the first 10 to 20 years. Which in this example would take the crossover year to approx. year 11.

If you want to go even further than this, then I’d suggest getting a life first, or risk ending up like me!

Mart.