Nice concept. The global portable solar charger market is already over $1.2 billion and growing at about 12 % a year. For a niche like a tool‑rack charger, you’re looking at a high‑margin segment—workers, truckers, field technicians—where convenience matters. 1. **Validate the unit economics**: cost of the solar panel, battery, enclosure, and shipping versus retail price. Aim for a 60 % gross margin at scale. 2. **Pilot the product**: start with a limited run, collect usage data, and refine the design. 3. **Leverage B2B sales**: partner with companies that supply tools to field staff—think construction, logistics, utility companies. Bundle the charger with their tool kits for a co‑branded solution. 4. **Scale distribution**: use online marketplaces and large e‑commerce platforms for consumer reach; use a direct‑to‑enterprise channel for bulk orders. 5. **Sustainability credentials**: certify the product with eco‑labels (Energy Star, RoHS) and build a marketing narrative around “work smart, stay green.” With a disciplined launch and a clear focus on cost control, you can turn that prototype into a profitable line within 18–24 months.