Hybrid Architecture Case Study: Bridging Solar and Grid Power in a High-Capacity Telecom Shelter
2026/11/13
Hybrid Architecture Case Study: Bridging Solar and Grid Power in a High-Capacity Telecom Shelter
Background
As telecom operators push into rural and peri-urban areas, they frequently face a dual challenge: the grid is either unreliable or entirely absent, but site loads are increasing due to 5G equipment and edge computing nodes. Relying solely on diesel generators is costly and logistically difficult, while pure solar setups often lack the redundancy required for 24/7 critical uptime.
A regional infrastructure provider recently addressed this by deploying a compact hybrid power system designed to seamlessly integrate multiple energy sources: the 12U 16kW Hybrid Power Rectifier System.
The Site Challenge
The site was a remote telecom shelter housing active 5G transmission equipment and battery backup. The operator required a continuous -48VDC power supply, but the local grid suffered from frequent brownouts. Furthermore, the shelter had limited rack space and relied on natural cooling, meaning the power solution had to be highly efficient to prevent thermal runaway.
The key requirements were:
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Flexible Source Integration: Ability to draw power from both the grid and an on-site solar array.
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High Capacity with Redundancy: Enough output to handle peak loads with N+1 safety margins.
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Minimal Footprint: A compact 19-inch rack solution that left room for transmission gear.
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Remote Manageability: Real-time monitoring over RS485/SNMP.
The Solution: A Dual-Source Power Platform
The operator selected a 12U hybrid rectifier system that combines both standard AC rectification and solar MPPT (Maximum Power Point Tracking) modules in a single chassis.
1. Multi-Source Input and Intelligent Distribution
The system accepts a single-phase 220VAC input (with dual 125A breakers for backup safety) and features an extremely wide DC input range of 120VDC to 425VDC for solar integration. This allows the site to directly connect a PV array without external charge controllers.
The system’s total capacity reaches 34kW with N+1 redundancy, utilizing a mix of four 4kW AC rectifier modules (16kW) and six 3kW PV modules (18kW). During daylight hours, the PV modules prioritize powering the load and charging the batteries. When solar is insufficient, the system seamlessly draws from the grid.
2. Thermal Efficiency in a Sealed Environment
Because the shelter relies on natural cooling, heat generation was a major concern. Both the rectifier and PV modules operate at >96% efficiency. At full output, they are rated for operation in ambient temperatures up to 50°C. This high efficiency means less waste heat is dissipated into the shelter, reducing the thermal load on the batteries and transmission equipment.
3. Comprehensive Protection
Given the site's exposure to lightning and grid spikes, the system was equipped with 20/40kA surge protection devices (SPDs) on both the AC and DC sides. The DC distribution included multiple BLVD (Battery Low Voltage Disconnect) breakers, allowing non-critical loads to be shed if the battery voltage dropped too low, preserving power for the essential 5G equipment.
4. Remote Monitoring
The integrated MC2900 controller provided the operator with continuous visibility. Using the RS485 and SNMP communication ports, the network operations center (NOC) could monitor the real-time status of both the solar input and the rectifier modules, receiving immediate dry-contact alarms if any module or breaker tripped.
The Outcome
By deploying the 12U hybrid system, the operator achieved a significant reduction in grid reliance and diesel generator usage. The compact 12U footprint allowed the site to maintain its existing transmission rack layout without requiring a larger shelter.
Furthermore, the ability to monitor the system remotely via SNMP eliminated the need for frequent physical inspections, while the N+1 redundancy ensured that a single module failure would not result in a site outage. The combination of high-efficiency conversion and wide input tolerance proved to be a practical, scalable model for future off-grid telecom deployments.
