Solar Panel Case Study - PV on split roofs


This detached house in Horsham has 2 x south-facing roofs; one is an apex and the other a parallelogram.

In order to maximise the kW yield from the limited roof space available we installed 12 x SANYO HIT N235W monocrystalline modules in 2 x strings.

SANYO HIT PV modules are considered to be some of the best on the market since they have a high efficiency, generate a higher kW yield/m2 than most other modules and are able to cope with ‘thermal degradation’ (in the summer months PV modules become hot and their efficiency can drop significantly above 25C).

The 12 x modules combine to give a 2.82 kWp DC output which is fed to a Power One Aurora 3.0 OUTD dual MPPT inverter. This inverter can cope with any differential shading (in this case from low winter sun in the early mornings) and so best optimise the kW yield from the entire PV array.

Annual yield expected 2,868 kWh. Total energy yield over 25 years expected 69,998 kWh. Total CO2 offset over 25 years expected 37,869 kg. Total FIT earnings over 25 years expected £31,393


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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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