Powering Remote Microwave Sites in South America: Solving Downtime Caused by Grid Instability

Executive Summary

In the complex geographical landscapes of South America, remote microwave relay stations face the dual challenges of severe grid instability and exorbitant maintenance costs. This case study explores the deployment of Eltek Flatpack2 48V SHE (Super High Efficiency) rectifiers to mitigate frequent downtime and optimize Operational Expenditure (OPEX) through wide voltage adaptability and industrial-grade reliability.

The Challenge: Unstable Grids and Remote Logistics

Telecommunications infrastructure in remote South American regions often grapples with extreme voltage fluctuations that frequently exceed the standard 180-240V range. For microwave sites, unstable AC input leads to rectifiers entering protection mode prematurely, triggering system shutdowns or excessive battery cycling. This not only shortens battery service life but also increases the frequency of costly site visits in mountainous or rainforest terrains, significantly inflating the Total Cost of Ownership (TCO).

Technical Solution: The Flatpack2 48V SHE Advantage

The Flatpack2 48V SHE module was selected as the core power conversion unit to address these specific environmental stressors. Its technical specifications provide the necessary margins for stable operation:

• Wide Input Voltage Range (85 - 264 VAC):
  Unlike standard rectifiers, the 48V SHE module operates across an expansive input window. It remains functional even when the grid drops as low as 85 VAC (with appropriate de-rating), preventing the system from unnecessarily draining battery reserves during minor brownouts.
• High Reliability (1.9 Million Hours MTBF):
  Tested under Telcordia SR-332 Iss.3 standards, the module’s high Mean Time Between Failures minimizes the need for emergency replacements at hard-to-reach border sites.
• 97.8% Peak Efficiency:
  This industry-leading efficiency reduces internal heat dissipation. Lower thermal output allows the module to maintain stable performance within a wide operating temperature range of -40°C to +75°C, easing the cooling burden on compact outdoor cabinets.

Performance Outcomes and Industry Insights

The retrofit project resulted in continuous uptime despite the harsh grid conditions. The stability of the system is backed by precise parametric data:

• Voltage Regulation Consistency: With dynamic voltage regulation of <50ms for 10-90% load variations, the output remains steady within ±5.0%, protecting sensitive microwave transmission hardware.
• Maintenance Optimization: The combination of Hot-Pluggable design and high MTBF has drastically reduced the frequency of onsite technical interventions.
• Economic Viability: By upgrading from legacy 92% efficiency modules to 97.8% SHE technology, operators in high-tariff regions projected a payback period of approximately 2 years.

Conclusion

The Flatpack2 48V SHE rectifier represents more than just energy savings; it is a critical safeguard for telecom infrastructure resilience. In regions with fragile power grids, utilizing power modules with high tolerance and extended service life is the most effective strategy for achieving sustainable network coverage and operational stability.