DLight Fridge
An affordable, portable refrigerator designed for off-grid communities where reliable electrical infrastructure is unavailable. Powered by solar-charged batteries, it keeps food cold passively for 24+ hours, supporting both family food security and small-scale commercial cold drink operations.
In regions with limited electrical infrastructure, access to refrigeration is a gateway to both food security and income generation. Cold drinks command premium prices, and families can safely store larger food supplies with reliable cooling.
The design challenge was creating an inexpensive, lightweight fridge that could operate entirely on solar power and remain portable enough for hand or motorcycle transport into remote homes. Rather than relying on power-hungry compressors, the design uses a passive thermal approach with a bank of saline freezer packs maintaining cold temperatures while a small opening on the top minimizes air escape and heat gain.
Parts are formed from lightweight materials using common, cheap manufacturing processes accessible to local producers. The cooling lines use standard automotive refrigerant gases, ensuring compatibility with existing infrastructure and repair networks.
Early concepts explored different thermal strategies and material approaches to minimize weight while maximizing insulation.
The final design emphasizes simplicity and manufacturability with a clean form optimized for portability and passive cooling efficiency.