How I Modeled an Off-Grid Solar Cell Site Starting From a Box on a Map
Most writing about rural 5G is about spectrum and beamforming. I want to write about the boring layer underneath it, which is power. In a lot of eastern Montana and northern Arizona, the site you are looking at is not plugged into anything. It generates its own electricity, stores it, and spends it carefully, the same way a satellite does. I got curious about how the pieces fit, so I walked one…
This report reconstructs an off-grid solar cell site starting from a simple box on a map. It focuses on the power aspect of rural 5G networks, rather than spectrum and beamforming. The site in question is located in eastern Montana and northern Arizona, where the infrastructure generates its own electricity, stores it, and manages its consumption carefully, similar to a satellite.
Upon visiting the site, it became clear that the power load is smaller than expected. The site primarily uses radio units for three sectors, microwave links for backhaul, a small heater or ventilation blower, and minimal lighting and monitoring electronics. These components collectively fall under the low-hundreds of watts, averaged over a day.
The solar array, consisting of two rows of ground-mounted panels on fixed tilt frames, is oriented to the south. The naive assumption that the array should be sized based on the annual average of sunlight is incorrect. Instead, designers calculate the array based on the shortest daylight hours, typically in December, to avoid outages.
The batteries and telecom cabinet are located under the raised edge of the array on a concrete pad. This placement is intentional, as panels shade most of the afternoon, and battery chemistry performs best in shaded conditions. The cabinets are shielded from water intrusion through sealed ports, and cable runs are concealed in shallow trenches visible as pale lines in the grass.
The site also features a small generator behind a ridge, serving as a last resort rather than a primary power source. To reconstruct the site, the author utilized a 3D modeling tool that generated a model of a square kilometer around the site based on a dragged box on the map. This model provided valuable information, such as terrain elevation, road grades, and the position of the monopole relative to the array rows.
However, the model had limitations, primarily in providing detailed information about cabinet dimensions, panel tilt, and anything beyond a few meters beyond the fence line.
In conclusion, the off-grid solar cell site functions as a small, self-contained power system with an antenna on top. Its geometry is conservative, favoring fixed tilt, south-facing panels, shaded batteries, oversized arrays, short cable runs, and well-maintained roads. The failure of rural connectivity lies not in modulation schemes but in factors such as icy panels, washboarded roads, and aging batteries.
This layer of understanding was previously unknown and has sparked a new interest in examining this aspect of rural connectivity.
Written by urgent.news from Dev.to's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
