NOVELTY - Solar cell module (20) (A1) comprises solar cell layer (14) with single or electrically interconnected solar cells and ionomer having sodium/zinc mixed ionomer neutralization product of precursor acid copolymer with copolymerized units of 2-10C alpha -olefin and copolymerized units (20-30 wt.%) of 3-8C alpha , beta -ethylenically unsaturated carboxylic acid, with melt flow rate of 70-1000 g/10 minute, determined with ASTM D1238.    USE - As a solar cell module (claimed) in bulk or wafer-based solar cells and thin film solar cells.    ADVANTAGE - The solar cell module has an encapsulant sheet with low haze, improved optical properties and high moisture resistance.    DETAILED DESCRIPTION - Solar cell module comprises solar cell layer with single solar cell or several electrically interconnected solar cells and ionomer having sodium/zinc mixed ionomer neutralization product of precursor acid copolymer, where precursor acid copolymer comprises copolymerized units of 2-10C alpha -olefin and copolymerized units (20-30 wt.%) of 3-8C alpha , beta -ethylenically unsaturated carboxylic acid, and has melt flow rate (70-1000) g/10 minute, as determined with ASTM D1238 at 190 degrees C and 2.16 kg. The precursor acid copolymer when neutralized to level of 40-90% based on total number of the carboxylic acid groups, to comprise carboxylate groups and counterions that consist of sodium ions, produces sodium ionomer having freeze enthalpy (less than 3 j/g) that is not detectable, when determined by differential scanning calorimetry with ASTM D3418, where sodium/zinc mixed ionomer comprises carboxylate groups and mixture of counterions consisting sodium cations (5-95%), and complementarily, zinc cations (5-95%), where sodium/zinc mixed ionomer comprises carboxylate groups and mixture of counterions consisting sodium cations (5-95%), and complementarily, zinc cations (5-95%). An INDEPENDENT CLAIM is included for preparing solar cell module involving providing assembly (A1) and laminating the assembly to form the solar cell module.    DESCRIPTION OF DRAWING(S) - The figure shows cross-sectional view of wafer-based solar cell module.    Solar cell layer (14)    Solar cell module (20)