What pre-sizing and pricing ratio could be taken into account for a collective project?

For engineering firms and energy specialists working on collective building projects in the competition phase, we recommend using our ‘quick ratios’ to size and cost the hybrid solar component using our Dualsun SPRING panels.

If you are in the preliminary design, detailed design or project design phase, please contact us directly for a more detailed study or specifications by filling in one of the forms available on the Specifier Area link, or by contacting your usual project contact person. 

These ratios provide quick figures during the competition phase, but they are not a substitute for a preliminary study or costing by a competent installer. The characteristics of an individual residential project will not follow these ratios.

Ratio tables:

Map showing the relevant installation areas for our collective offers

The grey areas below correspond to areas where thermal performance is not economically viable in relation to the estimated investment cost for a collective project (standard conditions)

A more detailed study can be carried out to examine the system's performance based on specific assumptions.

Table showing investment and maintenance ratios for solar installations based on installation size

P2: Labour for operation and maintenance.
This includes:

• Cleaning and routine maintenance of facilities

• Operation, monitoring and adjustment of various equipment

• Annual preventive maintenance

Also to read :

• What is the link between the normative power output Wth/m² and the a0 coefficient (optical efficiency)?

• What is the average annual production of a Dualsun SPRING panel ?