UK’s Sunswap Offers a Zero-Emission, Cost-Effective Alternative to Diesel Transport Refrigeration
Leatherhead, Surrey UK-based Sunswap is redefining transport refrigeration with Endurance, a fully integrated battery- and solar-powered system engineered to replace diesel without compromising performance. Designed for modern fleet operations, Endurance delivers zero-emission refrigeration with exceptional reliability, long runtimes, and rich operational data to reduce costs and improve efficiency.
Endurance combines right-sized battery capacity with rooftop solar that can supply up to 80 percent of annual energy needs, significantly reducing grid dependence and fuel costs. From a single charge, the system can support more than 24 hours of frozen operation, over two days of multi-temperature use, and up to two months of chilled operation. Despite its electric architecture, Endurance matches or exceeds diesel performance while operating quietly and with minimal maintenance.
The system is trailer-agnostic and supports single, dual, or triple temperature configurations using satellite evaporators. It maintains precise temperature control across frozen, chilled, and ambient zones, even during frequent door openings or demanding multi-drop routes. Built for year-round operation, Endurance performs reliably in both hot and cold climates.
What sets Endurance apart is its connected intelligence. Thousands of real-time data points monitor performance continuously, enabling predictive diagnostics and over-the-air software updates that improve efficiency and prevent downtime. This capability is extended through Sunswap Shield, which provides full fleet visibility, proactive maintenance, and comprehensive aftermarket support.
Leading logistics operators and retailers across the UK and Europe have validated Endurance in real-world operations, reporting operating cost reductions of up to 81 percent and total cost of ownership reductions of up to 43 percent compared to diesel. Customers consistently highlight ease of integration, quiet operation, and the ability to meet sustainability targets without changing routes or workflows.
With Endurance, Sunswap positions electric, solar-powered refrigeration not as an alternative, but as the future standard for cold chain transport.
Sunswap Shield: The New Standard in Transport Refrigeration Care
Sunswap also offers Sunswap Shield, a comprehensive aftermarket care and support program built to maximize uptime, utilization, and long-term asset performance. More than traditional repair and maintenance, Shield is a proactive, data-driven service model designed specifically for electric transport refrigeration.
Unlike conventional diesel systems that rely on reactive servicing, Shield focuses on prevention. Through remote diagnostics, cloud-based monitoring, and over-the-air software updates, issues are identified and resolved before they disrupt deliveries. Each Endurance unit continuously transmits operational data, enabling predictive diagnostics that reduce breakdown risk and extend equipment life.
Support is delivered through a 24/7 call center with rapid response targets and a UK-wide network of Sunswap-certified technicians. When on-site service is required, trained partners provide preventative maintenance, compliance checks, and emergency assistance to keep fleets moving.
Shield is structured around four tailored service tiers: Essentials, Defender, Guardian, and Forcefield. Packages range from core support for self-managed fleets to comprehensive, all-inclusive coverage with extended warranty protection. Operators can select the level of service that aligns with their operational risk profile, fleet scale, and internal maintenance capabilities.
Key features across the program include 4G connectivity, access to the Fleet Management Portal, data archiving, sensor calibration cover, critical and performance-enhancing over-the-air updates, planned maintenance inspections, F-Gas checks, and coverage options spanning battery, solar, refrigeration, and electrical systems. Higher tiers include expanded component and labor cover, vehicle maintenance unit access, and parts discounts.
Shield operates on a three-part model: predict and prevent through continuous monitoring, rapid response via certified field support, and continuous improvement through remote software optimisation. Because Endurance units have fewer moving parts than diesel alternatives, physical maintenance requirements are minimal, typically limited to one annual inspection.
With Sunswap Shield, fleets gain full visibility, reduced downtime, and a structured pathway to protect performance across a 10-plus-year asset lifespan.
