H2OME

Home / Uses / Long-duration backup for a rural cell tower site

When the cell tower's batteries run flat

In long outages after big storms, rural cell sites have gone quiet once their batteries ran down, leaving communities unable to call for help. This page looks at hydrogen as longer backup for a tower site.

Hours of battery, days of outage

A typical rural tower site has radio equipment, a transmission link, cooling for the equipment shelter and a battery bank sized for hours rather than days. When a storm takes out lines for longer, the site goes dark unless someone can reach it with a generator, which is often impossible on a slipped road. Hydrogen stored at 30 bar or less keeps for weeks, so it can stretch that window.

What it would keep running

  • Cell radio equipment
  • Backhaul transmission link
  • Shelter cooling fans
  • Site monitoring and alarms
  • Security lighting

A good match for the load

Tower site equipment is a steady load, comfortably within 15 kW, and it already expects a battery bank. The system's own LiFePO4 battery and UPS-mode inverter give an instant switch-over, then the fuel cell runs from stored hydrogen. No engine means no refuelling visits and no generator theft from an unattended hilltop.

Any work on telecommunications infrastructure is up to the network operator and their engineers. We would only ever pilot it with their involvement and on their terms, not as a retrofit by a landowner who hosts the tower. Their engineers know the equipment's limits and their own standards far better than anyone outside the network does.

How it works →
The H2OME loop: an electrolyser splits water into hydrogen, the hydrogen is stored in a tank for weeks, a fuel cell turns it into electricity for your home, and the water returns to the loop.

What it costs to hold the line

Round trip efficiency is 30% or less, so it costs more per unit than grid power. For a tower site that is a standby system, that matters less than the cost of a district losing its phones. It charges on off-peak grid power where the site has a line, or from a wind turbine on an exposed ridge. Sizing would come from measured site loads.

Questions

Could a landowner install this at a tower on their farm?

No. Tower equipment belongs to the network operator, and any change to how it is powered is their decision and their engineers' work. A pilot at a tower site would only happen with the operator directly involved from the start.

Why not just bigger batteries?

Batteries are excellent for hours. Covering several days with batteries alone needs a very large bank. Hydrogen stores energy for weeks in a low-pressure tank, so it can fill the gap between a battery's hours and an outage's days.

Is it safe on an unattended hilltop?

It is designed to AS/NZS 60079 and ISO 19880, with redundant leak sensors, automatic shutdown and venting, and no engine or open flame. Remote alarms would be part of any pilot so the operator knows its state at all times.

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