Total Volume
2,500 Units
Product Spec
150L DC Solar Refrigerator
Deployment Sectors
Health Care, Stores & Cafeterias
Annual Tariff Reduction
$467,200 Saved
1. Executive Project Overview
To eliminate escalating utility bills, bypass peak-hour electricity surcharges, and protect against grid tariff volatility across commercial and municipal facilities,
Sungreat Energy
successfully completed the deployment of 2,500 units of heavy-duty
150L solar refrigerator
systems in Estonia.
By replacing conventional, grid-powered refrigeration with high-efficiency direct-current (DC)
solar
units backed by dedicated energy storage, facilities across health care, retail store, and cafeteria sectors have reduced their refrigeration electricity charges to zero.
2. Distribution Breakdown
The 2,500 units of the Sungreat Energy 150L Solar Refrigerator were systematically allocated across three primary operational sectors:
| Category # | Target Sector | Primary Application | Allocated Units |
|---|---|---|---|
| 01 | Health Care | Vaccine cold chains, pharmaceutical storage, blood banks, and emergency medical wards | 1,000 Units |
| 02 | Stores | Retail grocery refrigeration, market cold display, and local distribution centers | 850 Units |
| 03 | Cafeterias | Institutional food service, school cafeterias, corporate dining, and public facility kitchens | 650 Units |
3. Technology Comparison
Standard household or commercial refrigerators running on alternating current (AC) draw continuous grid power and incur conversion losses. The table below illustrates how upgrading to a native DC solar refrigerator eliminates power consumption from the electrical grid.
Solar refrigerator overview
| Feature / Parameter | Sungreat 150L DC Solar Refrigerator | Classical AC Grid Refrigerator |
|---|---|---|
| Power Source | 100% Direct Solar PV & Battery Power | 100% Grid Utility Power / Diesel Backup |
| Utility Electricity Consumption | 0 kWh / Month (Zero Grid Draw) | ~42 kWh to 63 kWh / Month per unit |
| Power Conversion Efficiency | 0% Loss (Direct DC solar array coupling) | 15% – 25% Loss during AC transformation |
| Grid Outage Dependency | Unaffected (36-48 Hours Autonomous Battery Reserve) | Shuts down or requires expensive generator fuel |
| Thermal Insulation | High-density microcellular cyclopentane (100mm wall thickness) | Standard polyurethane foam (35-50mm wall thickness) |
| Operational Thermal Range | Stable cooling across wide ambient conditions (-10°C to +43°C) | Performance drops during high ambient temperature spikes |
| Carbon & Environmental Footprint | Zero Operational Emissions (R600a Eco Refrigerant) | High Grid Carbon Footprint (Fossil-based utility power) |
4. Electricity Cost Reduction
By transitioning 2,500 units from utility power to off-grid solar, health care facilities, retail stores, and commercial cafeterias completely eliminate refrigeration utility charges and peak-demand tariffs.
Solar Refrigerator Wiring
4.1 Electricity Cost Breakdown
- Grid Electricity Rate Baseline: ~$0.28 per kWh (Commercial/Institutional tariff average in Europe).
- Daily Grid Power Savings per Refrigerator: ~$0.51 USD saved per unit every 24 hours.
- Total Daily Electricity Charges Eliminated (2,500 Units): ~$1,280 USD / day.
- Monthly Electricity Bill Reduction: ~$38,930 USD / month.
- Annual Total Electricity Savings: ~$467,200 USD / year in reduced utility expenses.
- 10-Year Cumulative Electricity Savings: Over $4.67 Million USD saved on utility bills.
5. Project Execution Timeline
The 2,500-unit deployment across all three sectors in Estonia was completed systematically over a 16-week timeline:
- Weeks 1 – 3: Manufacturing & Quality Testing
2,500 units produced at Sungreat Energy facilities under strict ISO 9001, CE, and UN38.3 battery certification. - Weeks 4 – 8: Transport & European Customs Clearance
Containerized shipping to European logistics hubs and transit to regional staging facilities in Estonia. - Weeks 9 – 13: Sector Deployment & Setup
Delivery and plug-and-play installation across designated health care facilities, retail stores, and cafeteria kitchens. - Weeks 14 – 16: Operational Verification & Handover
Digital temperature audit, solar charge verification, and final operational sign-off.
6. International References
The equipment deployed in this project complies with global renewable energy guidelines and international quality standards:
- European Union Conformity (CE) & ISO Standards:
Certified under EU safety, electrical compliance, and environmental protection regulations. - World Health Organization (WHO) PQS Standards:
Meets medical cold chain performance guidelines set in the
WHO Performance, Quality and Safety (PQS) Catalogue. - UNICEF Cold Chain Technologies:
Engineered in alignment with
UNICEF Off-Grid Solar & Cold Chain Innovations. - International Energy Agency (IEA):
Supports energy efficiency and grid independence targets outlined in the
IEA Global Renewable Energy Reports.
Partner with Sungreat Energy
Whether you manage health care centers, retail store chains, or commercial cafeterias, explore OEM/ODM options for high-efficiency
solar refrigerators, BESS energy storage, and off-grid power solutions.
