Autonomous Solar Energy Integration for Off-Grid Industrial Refrigeration Units

Trane Technologies and ICS Cool Energy have validated an off-grid refrigeration system through joint field trials in Germany, combining insulated containerized cold storage with integrated photovoltaic power and energy storage. The system enables continuous temperature-controlled operation in temporary and remote applications without grid connectivity or diesel generator support.

Technical Challenge and Operational Context
Temporary cold storage in industrial logistics, food processing, and pharmaceutical supply chains requires strict temperature maintenance to prevent cargo loss. Operating refrigerated containers in off-grid sites, locations with unstable power grids, or regions subject to high energy costs traditionally necessitates diesel generators, which introduce fuel logistics, local emissions, and ongoing operational expense. To address this reliance, Trane Technologies provided its thermal engineering and refrigeration systems, while partner brand ICS Cool Energy contributed rental energy infrastructure, including battery energy storage system components.

Technical System Architecture and Operational Parameters
The technical solution integrates a 20-foot C-Store PLUS refrigerated container featuring enhanced thermal insulation with a frame-mounted photovoltaic array, a direct current transformer, and a 35 kWh battery energy storage system. The solar panels supply power directly to the refrigeration circuit via the transformer, while excess energy charges the battery storage unit to sustain operations during periods of low irradiance or night operation.

Field testing evaluated the system under ambient temperatures between 20°C and 30°C. The configuration maintained a constant internal setpoint of -18°C for over seven consecutive days without external grid connection. Solar input fluctuated based on weather conditions, generating 0.5 kW under rainy skies and up to 4.5 kW under full irradiance. The high-efficiency thermal envelope enabled the system to run on diffuse light during cloudy conditions, allowing the 35 kWh backup battery pack to remain near full capacity throughout the trial.

Deployment, Applications, and Scalability
The integrated off-grid refrigerated container is structured for deployment through rental fleets managed by Trane Rental Services and ICS Cool Energy. The target applications include short-term and long-term cold storage across remote construction sites, agricultural centers, event infrastructure, and industrial facilities facing grid capacity constraints.

The system design accommodates modular scaling. For existing cold storage assets, including 40-foot containerized units, standalone photovoltaic frames can be added to supplement grid power. Depending on local grid regulations, control systems can route excess solar energy back to the site grid or direct all output exclusively to the cooling unit to reduce baseline power consumption and operating expenses.

Edited by Evgeny Churilov, Induportals Media - Adapted by AI.

www.trane.eu