Solar Panel Case Study - PV on slate roof


This large country house in East Sussex was able to accommodate 12 x 295W mono crystalline HHV PV modules on its south-facing roof to give a total yield of 3.54 kWp.

Arranged as 2 x strings the DC electricity is fed into a Diehl 3800S inverter located in the loft.

Annual yield expected 3,274 kWh Total energy yield over 25 years expected 79,885 kWh Total CO2 offset over 25 years expected 43,219 kg Total FIT earnings over 25 years expected £35,828


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Feed in Tariff scheme

The FIT is a scheme in which owners of PV systems are rewarded for every unit of electricity they generate, irrespective of whether they are used on site or not.

This is known as the Generation Tariff and is currently under review. Payments are also made for 50% of every unit generated by the PV system. This is known as the Export Tariff and is currently under review. These payment rates are fixed for 20 years, linked to the Retail Price Index (RPI) and are tax-free. PV systems installed from 1 August 2012 will be subject to an approximate 7% decrease in the FIT rates.

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Frequently Asked Questions

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Read our dedicated Photovoltaic FAQ section that answers the most common queries.

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