A regional mobile operator in Latin America cut annual tower-site operating expense by 31 percent and reduced power-related outages from roughly nine hours per site per year to under one, after standardizing 140 remote towers on a three-phase UPS backed by lithium iron phosphate batteries. The program paid for itself in 22 months and freed technicians from weekly site climbs.
Before the program, the operator managed 140 macro and co-location towers spread across mountainous and coastal regions where the public grid was either weak or absent for long stretches. Each site carried a different mix of equipment: some ran on single-phase offline UPS units bought opportunistically, others on small inverters fed by lead-acid banks, and a few on generator-only backup with no battery buffer at all. Spares were not interchangeable, firmware was inconsistent, and no two sites logged faults the same way.
That fragmentation had a direct cost. A single model of rectifier or battery could not be stocked for every variant, so mean time to repair stretched past 48 hours on remote sites. Field teams carried a truck full of incompatible parts and still returned to base for the one they forgot.
Single-phase offline and line-interactive units are reasonable for a small office, but they were the wrong tool for a tower with a three-phase rectifier load and a generator that cycled daily. When the generator started, its frequency and voltage wandered for several seconds, and the single-phase units either rejected the source or passed the disturbance straight to the load. The result was avoidable resets of the transmission equipment and repeatedly drained batteries.
Lead-acid batteries compounded the problem. Cabinet temperatures on sun-exposed towers routinely reached 40 degrees Celsius, and at that temperature a sealed lead-acid string loses roughly half its rated life. The operator was replacing batteries every 18 to 24 months instead of the five years the datasheet promised, and each replacement meant a technician climb and a service window.
The standardized design specified a true online three-phase UPS sized at 1.25 times the site's continuous rectifier load, with a wide input frequency window so it rides through generator start without transferring the load. A lithium iron phosphate battery plant replaced the lead-acid banks, delivering the same usable energy in about a third of the footprint and weight, with a service life rated at eight to ten years even at elevated ambient temperatures.
Because every site now ran the same platform, the operator carried one rectifier spare, one battery module type, and a single monitoring profile. The UPS reports state of health, not just remaining runtime, so the control room can see a degrading cell before it becomes a site outage.
After twelve months across all 140 sites the operator recorded a 31 percent reduction in total tower-site operating expense. Battery replacements fell from roughly 90 string swaps per year to fewer than 12, and generator run-hours dropped 44 percent because the lithium plant absorbs short grid gaps that previously forced a generator start. Power-related outages fell from about nine hours per site per year to under one.
In fuel terms, the reduction in generator cycling saved an estimated 61,000 litres of diesel annually across the fleet, alongside the corresponding maintenance and logistics savings of sending a truck to a remote site. The combined capital and operating case reached payback in 22 months.
Each tower was converted during a planned maintenance window of under two hours. The new UPS was commissioned in parallel on the existing distribution, the load was transferred cleanly, and only then was the old equipment removed. Because the online topology isolates the load from the source, the transmission equipment never saw a break in clean power during the swap.
Monitoring was brought online before the first site went live, so the control room trusted the data from day one rather than discovering blind spots after a failure.
The single biggest lever was standardization. A homogeneous fleet turned a logistics nightmare into a one-spare, one-profile operation. The second was chemistry: lithium's temperature tolerance and long life removed the dominant recurring cost on hot, remote towers. The third was topology choice, online three-phase units that tolerate generator behaviour rather than single-phase units that fight it.
Operators running towers on weak or hybrid grids should treat backup power as a system, not a stack of boxes. Our telecom power configurations are described at https://www.upsboss.com/telecom/.
If you operate sites on weak, intermittent or generator-backed grids, the same playbook applies: standardize the platform, choose a topology that tolerates your source, and let battery chemistry do the heavy lifting on lifecycle cost. Start with a pilot of ten to twenty sites, measure diesel and outage minutes for a quarter, then scale on the proven number. Common questions about backup power for telecom are answered in our https://www.upsboss.com/faq/ resource.
If you are planning a tower-power standardization program, send us your typical site load, grid profile and generator behaviour and our engineers will return a sized three-phase UPS and battery configuration with monitoring. The current telecom-rated range is at https://www.upsboss.com/telecom/.
Key takeaway: the 31 percent OPEX cut came less from any single device than from three decisions made together: one standardized platform, lithium chemistry suited to hot remote cabinets, and online three-phase topology that stops fighting the generator. Measure a pilot, then scale on the number.
Why move from single-phase to three-phase UPS at a tower site?
A tower rectifier is itself a three-phase load, and a generator that cycles daily disturbs single-phase backup badly. A three-phase online unit rides through generator start and protects the load without battery drain.
How much did lithium batteries actually save?
On towers reaching 40 degrees Celsius, lead-acid strings were failing in 18 to 24 months; lithium is rated eight to ten years at that ambient, cutting swap count from about 90 per year to under 12 across the fleet.
Can a retrofit be done without taking the site offline?
Yes. Commission the new UPS in parallel on the existing distribution, transfer the load cleanly, then remove the old equipment inside a sub-two-hour window, so transmission gear never sees a power break.
Contact: Frank Zhang
Phone: +86-135 5688 8641
Email: frank@upsboss.com
Add: Jufeng Road, Guangming Street, Guangming District, Shenzhen City, Guangdong Province, China
