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I am looking to source high-efficiency solar panels utilizing heterojunction cell technology. Specifically, I'm interested in models that can deliver around 440 watts of power. It's essential for us to find panels with outstanding performance metrics, durability, and reliability under various environmental conditions. In addition to the specifications, please include information on pricing, bulk order discounts, shipping options, and delivery timelines. We're aiming to finalize our supplier choice soon, so a quick response would be greatly appreciated. Any additional details about warranty options and after-sales support you can provide will also be helpful for our decision-making process.