Liberta™ Solar facade

Energise your façade with architecturally impressive Liberta™ Solar for building integrated photo-voltaic panel systems.

Be inspired!

Experience the shape and the detail on the finished facade surface. Energise your facade with Liberta solar. Visualize the material and colours in different lighting,and from various perspectives, with the Ruukki Design Palette Visualiser.

The information on our website is accurate to the best of our knowledge and understanding. Although every effort has been made to ensure accuracy, the company cannot accept any responsibility for any direct or indirect damages resulting from possible errors or incorrect application of the information of this publication. We reserve the right to make changes.

Copyright © 2019 Ruukki Construction. All Rights Reserved.

    Technical information
    Ruukki-Liberta-Solar-basic-drawing

    Technical solution

    • Liberta Solar panel is a fully integrated system (building integrated photovoltaic BIPV) to facade which converts solar radiation directly to electricity. System is not dependent on solar heating, only on radiation. It can produce electricity also in such conditions where there is no direct solar radiation for example on cloudy or foggy weather.
    • Produced electricity is used directly to real-estate own purposes or fed to general grid.
    • Used PV (photovoltaic) modules are based on CIGS (copper indium gallium selenide) film technology which is more and more prevailing technology in solar cells.
    • Liberta Solar panels convert radiation directly to electricity. Electricity is gathered via cables behind the wall and it is transmitted to inverter which converts the electricity into alternating current (AC).
    • No visible cables, no penetrations to wall (all cables are in space behind the panels)
    • Two option for connection to grid:
      • When feed-in-tariff is in use, all energy is fed to the grid and bought back what needed
      • When feed-in-tariff is not in use, energy is fed for building own energy need or part of it

    Product Liberta Solar Panel
    A-dimension: 1198 mm (glass module width 1190mm)
    B-dimension: 798 mm (glass module height 790mm)
    Area  0.96 m2 
    Weight  < 25 kg / m2 
    Depth (C):
    39 mm
    Horizontal joint (Dh):
    8 mm
    Vertical joint (Dv):
    8 mm
    Fastening holes:
    Oval 5 x 10 mm
    Ventilation holes (in panel lower edge):
    Oval 5 x 15 mm
    Fasteners: Concealed
    Starting fillet:
    Required

     

    Power generation  
    Module power: 140-145 Wp
    Minimal power per m2 146 Wp
    Net area for 1 kWp:
    7.1 m2

     

    Case study:
    Calculations with Liberta Solar, in Finland - Helsinki region, integrated on facade to South

    per 1 m2 per 100 m2 per 400 m2
    Power: 0,146 kWp 14,7 kWp 58,1 kWp
    Modules: 1,04 pcs 105 pcs 415 pcs
    Grid feed-in/a: 95 kWh 9973 kWh 39 270 kWh
    CO2 emissions avoided/a 83 kg 8794 kg 34 630 kg

    Ruukki-liberta-solar-techical-solution
    Colors & coatings
    Colours and coatings
    Solar glass module: Nearly black surface, closest RAL colour is Traffic black 9017
    Bonding components: Black sealing
    Panel frame (steel): Colour RR45 Metallic graphite, coating Hiarc matt

     

    Primary manufacturing materials Material thickness
    Solar glass module (laminated glass*) 7.3 mm
    Bonding components 7 mm
    Steel frame with Hiarc coating 1.2 mm (frame total depth 25 mm)

    *Laminated glass is a type of safety glass that holds together when shattered. In the event of breaking, it is held in place by an interlayer between its two layers of glass. The interlayer keeps the layers of glass bonded even when broken, and its high strength prevents the glass from breaking up into large sharp pieces.










    Design tools

    General

    Liberta Solar panel facade is building-integrated photovoltaic (BIPV) system - functionally and visually integrated to facade surface with no visible add-ons. Nearly black glass surface and slim 8 mm joints enable high architectural standards. Solar facade helps to fulfil new requirements for higher energy efficiency and obtaining LEED and BREEAM credits. It is suitable for new buildings as well as renovation, and can be used in office, commercial, industrial and residential construction.

    Liberta Solar panel is standard size and part of the Ruukki Design Palette architectural claddings family, allowing for greater flexibility in design options when completing facade colours for the entire building. The area producing solar power does not need to stand out from the facade. To achieve a unified glass facade, Liberta Glass panels provide a visually consistent, free-sized complementary solution for corners and openings.

    Liberta Solar system does not depend on the warmth of the sun, only on solar radiation. Optimum power production is from a south-facing wall. To maximize energy generation it is recommended to be installed on walls between southeast and southwest. On walls facing east or west some of the production capacity will be lost. Any obstacles casting a shadow, either on the building itself or other objects, should also be taken into consideration Any solar radiation reflected from water of snow cover will increase the panels’ output.

    Liberta Solar panels are suitable for use in condition classes C2-C3 (EN 12944-2). If you are dealing with condition class C4, contact Ruukki’s technical support.

    Pre-designed delivery and inquiry

    Ruukki will deliver a conceptual design for mechanical as well electrical delivery, which will set out the size and structure of the façade panel components and electrical system and components in more detail. Ruukki’s experts will always examine the delivery content, material and design for each site on a case-by-case basis together with the customer. The conceptual design, feasibility study and inquiry will be based on the initial information on the site supplied by the customer (initial information form).

    Liberta-Solar-initial-information-form-doc

     

    Panel area, sizes and joints

    Size of the Liberta Solar panel is always a standard, 1190 mm x 790 mm (width x height). With 8 mm horizontal and vertical joints, the panel size from the middle of the joints is 1198 mm x 798 mm (A-dimension x B-dimension). The depth of the panel is 39 mm. To maximize the energy production it is recommended that the panel area is as solid and unified as possible.The number of square metres of the solar panels depends on the capacity required or the surface area available. The placement, potential and optimisation of the panels are always examined on a site-specific basis by Ruukki’s experts. 

    Colour coated support studs should always be used at the vertical joints between the panels, because they will be visible for the width of the joint. Zinc coated support studs are used in the middle areas behind the panels.

    Dimensioning

    The highest characteristic wind load that can be applied to an individual panel is ±2.4 kg/m2. The panels are attached to the substructure using vertical support studs. The wind suction load will be transferred to the vertical studs via the attachment screws and the pressure load via surface pressure. 

    The substructure to which the support studs are attached must be sufficiently rigid. As a basic rule, the substructure’s deflection limit is required to be L/400, where L is the span of the wall’s load-bearing structure. 

    The weight of the Liberta Solar facade, including its support studs and other accessories, is 26 kg/m2. Each panel weighs app. 17 kg. This must be taken into account when accessing the loading endurance of the substructure. The shiny glass facade also places strict restrictions on any measurement deviations in the positioning of the support studs. Since the panels are fastened directly to the support studs without any possibility for adjustment, the support studs must be positioned precisely.

    Fastening

    The panels have fastening holes at their top edge for the fastening screws: one hole at each corner and two in the middle. At least three screws must be used for each panel. In certain places, earthing screws will need to be fastened, as indicated in the electrical designs. Earthing screws are not counted as fastening screws. 

    The lower edges of the panels will be attached with a tongue-and-groove arrangement to the upper edges of the panels below. The lower edges of the lowest panels will be attached using separate starting fillets.

    Ventilation

    For the Liberta Solar facade structure to function properly, it is extremely important that its background is ventilated as well as possible, since electrical output can be hampered if the module’s temperature rises too high. The support studs used as a standard are 35 mm in height.

    It is extremely important that supply air and ventilation gaps of at least 25 mm are left at the top and bottom edges of the facade. This must be taken into account in any discontinuities and non-contiguous areas in the facade. When designing the wall structure, it is important that the ventilation gaps can be easily inspected and maintained annually.

    Fire properties

    In terms of fire resistance, Liberta Solar facade is comparable to a glass facade. The requirement concerning exterior surfaces applies to the panels. Glass and steel, the main components of the panels, are class A1 construction materials, and as such are suited to all types of buildings. Since the system contains “minor quantities” of other materials, the fire properties of these must always be assessed in collaboration with the local authorities.

    Accessories
    Liberta Solar facade system completed with support studs, flashings, fasteners and electrical components provides a fully finished facade, as well easy and quick installation.
    Instructions

    Installation

    Main points of mechanical installation

    • Installation principle is same as in Liberta elegant 500 panels
    • Support studs are fastened to backing wall -> the surface is straightened if needed
    • Starting fillets are fastened to the support studs
    • Solar panels are fastened to the support studs by fastening screws
    • Installation of panels is started from left lower corner
    • Horizontal and vertical joints between the panels are standard 8 mm

    Main points of electrical installation

    • No visible cables, no penetrations to wall
    • All cabling behind modules, ready wiring harness
    • Reliable factory-made connectors
    • Fast connection, connectors easy to use
    • Wiring system easy to follow for an electrician
    • Inverter fully automatic with all safety aspects
    • Wiring and connection work is everyday work for an electrician

    The electrical system must be installed by an electrician with the appropriate qualification for this class of work. The electrician must read the designs and safety guidelines delivered with the system. The installation itself is similar to any typical electrical installation work performed on buildings.

    Installation instruction will be delivered with the Solar panel delivery package.

    Maintenance

    Liberta solar facade is nearly maintenance-free. However, regular visual inspections must be performed:

    • Check the surface of Liberta Solar panels for possible dust and dirt accumulated and blocking.
    • Check and ensure that the minimum ventilation gap (25 mm) at the bottom and the top is left and working in all conditions (for example check related flashing and if possible check the minimum ventilation cavity (35 mm) behind the panels left).

    In case of Liberta Solar panel broken down on the wall installed, the broken panel needs to be replaced with new one. One individual panel can be replaced by dismounting other panels on the top of the panel to be replaced. The panels are dismounted one by one starting from the top.

    If it is found that the normal electricity production has decreased substantially, it could be that some of the panels have broken down. Then the electrical circles shall be checked by electrician.

    Certificates & approvals

    Delivery content

    Liberta Solar facade is delivered as a component delivery, including necessary mechanical and electrical components. With regards to the mechanical components, Ruukki will create guideline designs for the positioning of Liberta™ Solar panels on the facade and define the applicable principles concerning structure types and the fastening and connection details. Based on these, the customer will create the final mechanical designs for the site and consider how the Liberta™ Solar facade will fit with the building’s overall structure. Ruukki will deliver a complete electrical design concerning the Liberta™ Solar facade’s electrical components.

    Principle:

    • Pre-designed system:
    • Guideline mechanical design for the Liberta Solar components in the area covered by the Liberta Solar facade.
    • Complete electrical design for the Liberta™ Solar façade (to the point of grid connection)
    • Component delivery: components needed at the worksite

    General description of the delivery content of Ruukki`s Liberta Solar facade:

    Mechanical components

    • Liberta Solar panels
    • Fastening screws to Liberta Solar panels
    • Support studs to Liberta Solar panels
    • Grommets and edge protections to support studs
    • Starting fillets
    • Fastening screws to starting fillets
    • Joint flashings for the Liberta Solar facade area

    Ruukki`s delivery does not include any other facade materials than the Liberta Solar panels and accessories mentioned above. The supply of any other materials required for completion of the facade around the area covered with Liberta Solar panels must be agreed separately.

    Electrical componentst (connecting Liberta Solar panels to the inverters):

    • Inverter
    • DC switch (optional, not included in delivery)
    • DC cables (for the Liberta Solar facade area)
    • Array box (if necessary, included in delivery)
    • DC connectors
    • Necessary earthing components (for the Liberta Solar facade area)

    Cabling is dependent on the locations of the final connection points at the real estate. Supply of the cables and power measurement devices below must always be agreed separately (if necessary, supplied also by Ruukki):

    • The customer will be responsible for the cable between the array box and the inverter
    • The customer will be responsible for the cable between the inverter and the input point
    • The customer will be responsible for the earthing cable between the facade and the building`s earthing point
    • The customer will be responsible for the earthing cable between the inverter and the building`s earthing point
    • The customer will be responsible for any necessary power measurement devices

    Delivery to the worksite

    The components are usually delivered in a single delivery to the worksite. The products are packaged and marked in accordance with the installation sequence indicated in the designs. Installation instruction will be delivered with the Solar panel delivery package.

    Packages

    The Solar panels are delivered to the installation site in cardboard boxes. When unloading the packages have to be immediately transferred to dry indoor conditions.

    Storing and handling

    The panels can be storaged in their packages in dry conditions. The panels must be handled properly to prevent any damages.

    Identification

    A print containing package-specific information such as order, load and package numbers, contact information, content of the package (panel type, dimensions and items) and package weight is attached to the package. 
    The panels are marked with a code from layout design. With the code individual panels can be allocated to a specific position in the building.

    Construction permits and approvals

    The panels as part of overall facade is subject to local applicable building regulations. The system always requires individual local approval in a project, in which Ruukki can help providing necessary support. It is important that a client or client`s consultant structural engineer for a project confirms and approve the usability of the system as part of the overall construction.

    Quality control

    Quality inspection of the panels is performed with the requirements by the manufacturer.