NOVELTY - Photovoltaic module comprises at least one layer or film of a cured encapsulant, where the encapsulant in the uncured liquid state having at least one high durability polymer (HDP), at least one unsaturated monomer and/or oligomer, and at least one photoinitiator. The module comprising at least one photovoltaic cell and at least one surface selected from glass and plastic, where bonding between the cell and surface is provided by bonding layer comprising the cured encapsulant.    USE - As photovoltaic modules (claimed) or cells useful for inverter, or battery.    ADVANTAGE - The cured encapsulant has Tg lower than 50 (preferably lower than 15, especially lower than -20, particularly -50) degrees C; light transmission through 500 micrometers (microns) of cured mass of at least 85% of the original light intensity in the wavelength range of 300-800 nanometers; tensile storage modulus at 1Hz at 23 degrees C or at -40 degrees C of 0.001-250 MPa; shore hardness according ASTM D-2240 of soft gel to 100A; refractive index of 1.4-1.6.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) liquid encapsulant formulation (F1) for optical photovoltaic module assembly comprising at least one high durability polymer (HDP), at least one unsaturated monomer and/or oligomer, and at least one photoinitiator, the liquid encapsulant is polymerizable and/or cross linked in response to light. The formulation further comprises at least one additive selected from plasticizer, adhesion promoting agent in the form of monomer, oligomer or polymer, and stabilizer;    (2) cured encapsulant mass prepared by providing formulation (F1) and curing the formulation; and    (3) device capable of providing electrical potential and/or current when irradiated by light, in the range of wavelengths of 200-1200 nanometers, comprising at least one layer or film of a cured encapsulant, where the encapsulant in the uncured liquid state comprising at least one high durability polymer (HDP), at least one unsaturated monomer and/or oligomer, and at least one photoinitiator.