Replacing gas boiler by an electric boiler

jbuchanangb

You might consider solar hot water instead of solar PV. My panels were installed 9 years ago. 18 months later I had double glazing installed.

I am saving about £300 per year on gas costs as a result. Typical quarterly consumption before was 175 hundred cu ft, afterwards 125 hundred cu ft. These figures averaged across full year so full year was 700, is now 500, or about 22000 KwH reduced to 15800 KwH.

Maybe one day I will get back my investment.

Martyn1981

NacNac wrote: »

Hi Martin

thanks, just trying (at the moment not too hard though) to get my head around all this.
The 15,000 kWh only comes from an brief discussion from a guy from A Shade Greener who saw the house (his job was just to make aware home owner of potential suitable houses of A Shade Greener. Nothing technical). He said that due to the exposition and size of the roof, they could fit 18 panels to produce roughly 15,000 kWh so it could be that the day I have my roof covered of panels, they can only get 10,000 kWh.

Best regards

Hiya NacNac. Apologies if this sounds pedantic, but best to get your head around the numbers before you get misled:

18 panels would typically be around 4.5kWp. You won't get 15,000kWh or 10,000kWh from a 'normal house' PV system. Work on the basis that a good south facing system in southern UK will generate around 1,000kWh per kWp installed.

So a normal install, on a good to large sized roof will be 4kWp, and generate around 4,000kWh. You can go bigger, but
1. where would you put them?
2. the subsidy for 4-10kWp is lower (10% less)
3. the DNO can refuse permission for the installation of a system that 'can potentially' export more than 3.68kW. Most inverters installed on 4kWp(ish) systems will now be capped to 3.68kW.

I only chatted about 15,000kWh in response to you. My systems generate approx 800kWh/kWp ESE and 700kWh/kWp WNW.

If you want a very accurate guesstimate for your property, have a play on the PVGIS site. There are instructions/walkthrough on the PV FAQ thread section 5.

https://forums.moneysavingexpert.com/discussion/3872445

Just a thought, but for wall mounted panels (of any type), I think you'll need planning permission.

All the best.

Mart.