NOVELTY - Multilayered backsheet (1) comprises: an optional top layer (layer (a1)) (2); an insulating layer (layer (a2)) (2); and a back layer (layer (a3)) (4), where at least one sublayer is optionally present in between each layer, the top layer, the insulating layer and the back layer contain a polyolefin as the major component, and the polyolefin is polyethene or polypropene homo- or co-polymers.    USE - The multilayered backsheet is useful for a solar module (claimed).    ADVANTAGE - The multilayered backsheet: has a dielectric breakdown voltage of at least 20 kV, and a reduction of dielectric break down voltage of less than 1% and a reduction in elongation at break and tensile strength of less then 20% after being exposed to steam at a temperature of 121 degrees C and a pressure of 1 bar for 100 hours (claimed); has smooth or rough surfaces on one or both of its external sides, where rough surfaces facilitate deaeration during the lamination process when the backsheet is included in a solar cell module; is prepared at low raw material costs; has the desired mechanical properties including elongation at break and/or tensile strength, electrical insulation and/or long-term stability under moisture and heat; is capable to load up to 20 wt.% or up to 30 wt.% per layer with flame retardants or flame retardants and anti-dripping agents and thus has a good anti-burning behavior; and is compatible with the sealant and thus provide good sealing of the interface of the backsheet and encapsulant layer of the solar module.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (1) a solar module comprising at least one solar cell and at least one encapsulating layer and further comprising the backsheet;    (2) making the backsheet, comprising providing compositions for making layers (a1), (a2) and (a3), coextruding the compositions into a multilayered article, and optionally crosslinking; and    (3) making the solar module, comprising vacuum laminating the backsheet to a solar module.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic cross-sectional view of the backsheet.    Backsheet (1)    Top layer (2)    Insulating layer (3)    Back layer (4)    Optional layer (5)