PV in Broughton Leys

Surprise on my doorstep.

I keep an "solar" eye on CAT at Machynlleth and the Hockerton Housing Partnership.

Broughton Leys is another area to peruse, and it's only a stone's throw from where I live.

The installation is very discrete. I had previously visited the estate on other business and had not noticed the panels.

Looking for links I found this flier, then a report on DTI’s Domestic BIPV Systems Field Trial. (Building Integrated PhotoVoltaic)

Bloor Homes and English Partnerships are collaborating in this project to integrate 17 PV systems into a large new-build development at Broughton Leys, in Milton Keynes. The PV systems will be installed onto a mixture of social and private houses. Eight of them are terrace houses in a crescent shape. The remaining houses have been selected for their south facing roofs. The house designs incorporate high energy performance (NHER 10) with good standards of insulation, condensing boilers and low heat loss glazing. The development, based on the urban village principle, has won a design award. The Pfleiderer Terra Piatta solar tiles use Solarwatt crystalline modules. Each module takes the place of six ordinary clay tiles, which are a flat tile in this case. They have been installed, without requiring excessive extra time, by the main roofing contractor with a little training by Solar Century.

  • 17 systems
  • 36.6kWp total rating
  • Pfleiderer Terra Piatta tiles 52Wp
  • 30º and 40º inclinations, orientation almost due south
  • DNO Powergen (East Midlands Electricity)
  • Final commissioning November 2002
Roof, November 2003
Roof, November 2003
Roof, November 2003

Case Study

From this DTI report I read:

The installation costs of these sites is falling to as little as £0.10 per watt peak.

Monitoring is not covered extensively in this report due to lack of sufficient data to draw any meaningful conclusions. A monitoring issue has also come to light in that the on – board monitoring of one brand of inverter is not as accurate as first suggested when the trials began. In particular, the DC current is not measured but derived fro
m the AC power, reducing the accuracy. In view of this, it is advisable to fit extra metering equipment to check the data validity.

(This is has been my angle all along: you have to monitor else you don't know how "good" it is!)

In terms of functional integration it could be expected that PV would only be installed on houses which are already energy efficient. These houses scored an NHER rating of 10 with 100mm. cavity insulation, two zone heating, 3-400 mm. insulated lofts, low-E Argon filled glass, and condensing boilers. Such efficient housing is new to Bloor, but they have not experienced any problems with installing these features, or the PV.

Pfleiderer modules are used.

Here's a web page on Photovoltaic modules used as roof tiles.

Some advanced solutions were presented in past few years. The most known is probably the Pfleiderer Roof Tile "Terra-Piatta® - Solar" produced by Pfleiderer-Dachziegelwerke GmbH was awarded with the German Design Award 2002. The Design Award of the Federal Republic of Germany, is the highest official design honour of the state and is lent by the Rat für Formgebung/German Design Council on behalf of the Federal Ministry for Economics and Technology.

A happy chap with PV tilesPfleiderer

Pfleiderer Dachziegelwerke are part of the Etex Group. Dachziegelwerke is German for roofing tile works. Yes, you guessed it, they make roof tiles.

They manufacture a 6 tile sized PV module, the Terra Piatta®solar.

The vertical pitch of the tile is different to UK tiles.