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Convention 1.01 - Single Metering with Multiple Renewables (Apportionment of PV)
Posted by Mike Gordon on 22 July 2015 08:44 AM

Where part of a building (Refinement) is being assessed for New Build Compliance or EPC purposes AND the building has:-

(a) Photovoltaic (PV) panels affixed to the building; and

(b) One electricity meter serves the whole building; and

(c) The PV is attached to the meter in the building.

the area of PV shall be apportioned to the Refinement on an area weighted basis using the following formula:-

PV apportioned =            Area of PV Installation x Gross Internal Floor Area of Refinement

Gross Internal Floor Area of Whole Building

Note: Area of whole building to include communal areas

Where the PV installation has multiple arrays with different attributes, each array with different attributes must be apportioned separately for inclusion in the New Build Compliance or EPC calculation.

Where there is more than one meter present in the building, the assessor may only include the PV if the PV only serves the Refinement and is attached to the dedicated meter serving that Refinement. Appropriate documentary evidence must be provided to support the inclusion of the PV in the EPC in these circumstances.

Where software allows the option to enter the kW of the PV system the following formula shall be used :-

 

PV apportioned =            kW of PV Installation x   Gross Internal Floor Area of Refinement

Gross Internal Floor Area of Whole Building

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