Powering Remote 5G Small Cells in Rural Networks

Powering Remote 5G Small Cells in Rural Networks

The Situation

A regional telecommunications operator deployed 5G small cells across rural areas. Sites had no climate control, no three-phase power, and were housed in compact outdoor cabinets. Within three months, the operator encountered site outages, rectifier failures, and rapid battery degradation at rates far higher than anticipated.

The Challenges

Grid instability was the primary issue. Input voltages dropped well below nominal levels during peak loads. The specified rectifier required a minimum voltage to deliver full output — below that, it shut down or reduced capacity. The result was battery deep discharge, premature failure, and site blackouts.

High temperatures compounded the problem. Cabinet interiors reached temperatures that exceeded the system's full-output rating. The system's datasheet claimed a broad operating range, but full output was only guaranteed up to a lower threshold. Above that, the system delivered significantly less than rated capacity.

Limited space and remote locations added pressure. Sites were far from service centers on difficult roads. Each unscheduled visit was costly in travel time and labor.

The Solution

The operator selected the ET48150, a 1U 19-inch power system designed for small cell and transmission applications.

The 1U footprint preserved cabinet space. At 96.6% efficiency, it dissipates significantly less heat than conventional 94% efficient systems. In non-air-conditioned cabinets, this meant lower internal temperatures and longer component life.

The wide input voltage range was critical. Unlike systems that fail below the nominal threshold, this unit remains fully operational across a broad input window, eliminating voltage-sag outages.

Full output is guaranteed at temperatures matching the site's actual conditions, so no derating was required. Above certain altitudes, the system applies a clear derating formula, useful for future highland expansions.

The N+1 modular design uses hot-swappable rectifiers, so a single module failure does not take the site offline. Front-access cabling simplifies installation. Remote monitoring via standard communication interfaces allows the network operations center to track status and receive alarms — eliminating routine site visits.

The Results

The wide input range eliminated sag-related outages. The high efficiency lowered cabinet temperatures. Modular redundancy prevented single-point failures. Remote monitoring reduced dispatch costs and improved response times.

What This Demonstrates

In many regions, environmental extremes are the norm, not exceptions. Hidden derating curves and narrow input windows lead to underperformance. Efficiency is a reliability metric — every watt of waste heat shortens component life. Wide input tolerance is not optional for rural sites. Modular redundancy and remote management pay for themselves through avoided service calls.

Conclusion

For operators across diverse regions, the key question is not "does this meet the spec sheet" but "does this deliver full output at elevated temperatures, at low input voltages, in a compact footprint, with remote monitoring?" Systems that answer yes reduce total cost of ownership and support reliable network expansion.