KLG Rutland

About the client

KLG Rutland has been installing windows, doors and conservatories in the East Midlands for over 45 years, manufacturing all doors and windows at their base in Beeston, Nottingham.

Drivers for the project

To reduce Carbon Emissions and help save on energy costs.


Firstly, the client’s electricity usage was analysed with the optimum system size calculated as 29.7kWp. In order to achieve this 108 No. 275Wp panels were installed on the south-east facing roofs of the site, with 2 No. 12kW Solis inverters. This combination of inverters sizes was chosen to ensure the maximum efficiency could be gained from the PV array. Suitable isolators, a new dedicated PV distribution board and generation meter were installed and fitted seamlessly into the sites existing electrical network.

A predicted 85% of generated electricity will be consumed on site by the client. It will produce enough electricity (24,532 kWh per annum) to power around 7 residential homes per year or power 11 electric cars. After 25 years in operation the project is predicted to have saved 48.3 tonnes of CO2e, an equivalent of 252,194 fossil fuelled car miles, 32 fossil fuelled cars off the road and 195 pine trees planted.


Before works could commence the roofing was successfully reinforced. The high slope of the south facing sawtooth roof pitches created large shading areas but was overcome by installing the PV arrays in a single row at the top near the roof ridge.


The initial programme was to complete the installation within three days and we successfully delivered a fully commissioned system following a client handover within this period.

Project details

System size
29.7 KWP
Panel Manufacturer
BYD 275
Number of panels
Inverter Manufacturer
Annual system generation
24,532 KWH
Completion date
July 2019
KLG Rutland website