In India, the rapid growth of solar energy has led to a substantial increase in its production and so subsequent disposal of solar panels pose significant environmental challenges, highlighting the need for efficient closed-loop supply chain (CLSC) models specifically tailored for the solar industry. However, the current CLSC systems for e-waste management in the solar industry face numerous challenges in effectively recycling, repurposing, and reducing the environmental footprint during their mid crisis or end-of-life. This study uses a methodology for analyzing critical collaborative factors (CCF) in CLSC for e-waste management pertinent to the solar industry within the Indian pretext. A comprehensive review of existing literature, 12 CCF along with 3 novel CCF have been identified through the discussions with subject matter experts. Professionals with extensive experience in the solar industry have been contacted to assess the interconnections among these factors. To interpret the responses, the study employs Grey Relational Analysis (GRA) to streamline the number of CCF, followed by the application of Grey DEMATEL to elucidate causal relationship amongst the factors. Factors identified as enablers, such as the Collaborative Performance System and Benevolence, have cascading positive effects throughout the entire system, potentially reinforcing outcomes such as Top Management Commitment and Integrated Supply Chain Process. However, vigilant oversight of factors such as Top Management Commitment, which is contingent upon the efficacy of other factors, is essential. The incorporation of three novel factors enriches the existing body of knowledge, thereby making a substantial contribution to theoretical research implications. For managerial perspective strategic focus on primary CCF helps in taking informed decisions that can led to substantial improvement across the system.