TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The panel further comprises a photovoltaic cell, where the high-flow interlayer encapsulates the photovoltaic cell.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The mixture comprises 10-75 parts, preferably 25-50 parts of plasticizer including per one hundred parts poly(vinyl butyral) resin. The mixture comprises 5-90 parts, preferably 5-25 parts of epoxidized vegetable oil per one hundred parts poly(vinyl butyral) resin. The epoxidized vegetable oil is epoxidized soybean oil (preferred) or epoxidized linseed oil. The interlayer is a multilayered interlayer. In the interlayer (L1), the poly(vinyl butyral) layer has a glass transition temperature of less than or equal to 4degree C. In the interlayer (L2), the poly(vinyl butyral) layer has a glass transition temperature of greater than or equal to 39degree C. In the interlayer (L1), the poly(vinyl butyral) layer further comprises: at least one of the plasticizers, where the poly(vinyl butyral) layer comprises a combined total of less than 100 parts of epoxidized vegetable oil and plasticizer per one hundred parts poly(vinyl butyral); and a second poly(vinyl butyral) layer and a third poly (vinyl butyral) layer, where the second and third poly(vinyl butyral) layers have a glass transition temperature of 25-40degree C, and the first poly (vinyl butyral) layer is disposed between the second and third poly(vinyl butyral) layers. In the interlayer (L2), the poly (vinyl butyral) layer further comprises: at least one of the plasticizers, where the poly(vinyl butyral) layer comprises a combined total of less than or equal to 50 parts of epoxidized vegetable oil and plasticizer per one hundred parts poly(vinyl butyral); and second poly(vinyl butyral) layer and third poly(vinyl butyral) layer, where the second and third poly (vinyl butyral) layers have glass transition temperature of 20-35degree C, and the first poly (vinyl butyral) layer is disposed between the second and third poly(vinyl butyral) layers. EXAMPLE - The skin layers were produced by mixing and melt-extruding the mixtures of 100 parts poly(vinyl butyral) resin having 18.7 wt.% of residual hydroxy groups and epoxidized soybean oil (45 per one hundred parts (phr)) was added with other common additives. Then the core layers were produced by mixing and melt-extruding the mixtures of 100 parts poly(vinyl butyral) resin having 9.2 wt.% of residual hydroxy groups and epoxidized soybean oil (90 phr) was added with other common additives. All the skin and core layers were conditioned to 0.4 wt.% moisture content. The skin layers were then laminated together with the respective core layer, to obtain the high-flow interlayer.