NOVELTY - A solar cell module comprises solar cell assembly containing at least one solar cell and an oxidizable metal component. The solar cell assembly is encapsulated by a poly(vinyl butyral) encapsulant, where the oxidizable metal component is in contact with the poly(vinyl butyral) encapsulant. The poly(vinyl butyral) encapsulant comprises a poly(vinyl butyral) resin, plasticizer (15-45 wt.%) and hindered amine (0.5-2 wt.%).    USE - As a solar cell module (claimed), used to convert solar energy to electricity.    ADVANTAGE - The poly(vinyl butyral) composition used as an encapsulant material for solar cell modules that resists discoloration when in contact with oxidizable metal components over the life of the solar cell module.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: 1) pre-lamination assembly for preparing a solar cell module comprising: solar cell assembly containing at least one solar cell and an oxidizable metal component; poly(vinyl butyral) sheet having a thickness of 0.25-1.2 mm and containing poly(vinyl butyral) encapsulant, where the poly(vinyl butyral) encapsulant contains poly(vinyl butyral) resin, plasticizer (15-45 wt.%) and hindered amine (0.5-2 wt.%); and optionally the poly(vinyl butyral) sheet having yellowness index of less than or equal to 60, as measured in accordance with ASTM E313-05 after 1000 hours at 85% relative humidity (RH) and at 85 degrees C with a bias of 1000 V, where the poly(vinyl butyral) sheet is in contact with the oxidizable metal component; and 2) reducing or preventing discoloration of poly(vinyl butyral) encapsulant in a solar cell module involving providing a poly(vinyl butyral) sheet comprising a poly(vinyl butyral) encapsulant, where the poly(vinyl butyral) encapsulant contains poly(vinyl butyral) encapsulant containing poly(vinyl butyral) resin, plasticizer (15-45 wt.%) and hindered amine (0.5-2 wt.%), and optionally the poly(vinyl butyral) sheet has yellowness index of less than or equal to 60, as measured in accordance with ASTM E313-05 after 1000 hours at 85% relative humidity (RH) and at 85 degrees C with a bias of 1000 V; forming a solar cell module by encapsulating a solar cell assembly in the poly(vinyl butyral) sheet, where the solar cell assembly contains oxidizable metal component that is in contact with the poly(vinyl butyral) sheet; and operating the solar cell module under a set of conditions for a period of time, where the yellowness index of the poly(vinyl butyral) encapsulant is unchanged after the period of operation, or the change in the yellowness index of the poly(vinyl butyral) encapsulant after the period of operation is smaller than the change in the yellowness index of a second poly(vinyl butyral) encapsulant after the same period of operation under the same set of conditions in a second solar cell module that is identical to the solar cell module, where the second poly(vinyl butyral) encapsulant does not contains hindered amine.