Solar Telecom Tower Calculator

Size an off-grid solar system for a telecom tower. Enter tower load and diesel cost — get solar array, battery bank, annual savings, and 10-year TCO vs diesel.

Tower specifications

Tower power load?

Location (peak sun hours)?

Battery autonomy?

days

Diesel fuel cost?

$/liter

Solar off-grid system for telecom tower

5.6 kW solar + 90 kWh battery

Tower power draw1,000 W (24/7)

Daily energy24.0 kWh/day

Solar array14 × 400W panels (5.6 kW)

Battery bank90 kWh (LiFePO4)

Charge controller120A MPPT (48V)

Annual diesel savings$3,504 (2,920 L/yr)

CO₂ reduction6.5 tons/yr

Est. system cost$70,500

Payback vs diesel20.1 yrs

10-yr solar TCO$77,550

10-yr diesel TCO$40,621

10-yr net savings$-36,929

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How to Use This Calculator

Select your tower power load

Choose the total continuous power draw of your telecom tower. This includes all radio equipment (BTS, antennas, microwave links), rectifiers, cooling systems, and ancillary loads. Small rural towers (1kW) power a single sector with minimal cooling; urban macro towers (10kW) run multiple sectors, high-power amplifiers, and air conditioning. If you have actual site energy data, use the 24/7 load figure from your energy audit.

Set location and battery autonomy

Location determines peak sun hours — the single biggest variable in solar sizing. Enter the correct PSH for your tower site, not the nearest city. Remote mountain sites often have better PSH than nearby valleys. Battery autonomy (days of backup) is a critical reliability parameter: most operators use 3 days for sites with reasonable access, and 5-7 days for remote or high-reliability sites.

Enter diesel fuel cost

Diesel cost is what makes or breaks the economics. At $1.10/L, a 2kW tower consumes $24,000+ in diesel annually. Remote island or jungle sites at $2.00/L see twice the savings, making solar payback under 3 years common. Use your actual delivered fuel cost including transport and handling.

The Formula

Daily Energy = Tower Watts × 24 hours ÷ 1000 Solar Array kW = Daily kWh × 1000 ÷ PSH ÷ 0.85 efficiency Panels = Solar Array Watts ÷ 400W (round up) Battery kWh = Daily kWh × Autonomy Days ÷ 0.80 DoD Charge Controller A = Array Watts ÷ 48V (round up to nearest 10A) Annual Diesel Liters = Daily kWh ÷ 3.0 kWh/L × 365 Annual Diesel Cost = Annual Liters × Diesel $/L CO₂ Reduction = Annual kWh × 0.74 kg CO₂/kWh Payback = System Cost ÷ Annual Diesel Savings 10-yr Solar TCO = System Cost + 1% annual maintenance 10-yr Diesel TCO = Annual Cost × 10 × 1.03⁵ inflation factor

Telecom towers operate 24/7 at near-constant load — this makes solar + battery sizing highly predictable. The 3.0 kWh/liter diesel figure assumes a modern diesel genset at ~30% efficiency. Older generators produce only 2.5 kWh/liter, making solar savings even higher. The 10-year diesel TCO includes a ~3% annual fuel price inflation factor.

Example

MTN Nigeria — Remote 2kW rural tower

A mobile network operator needs to power a 2kW rural tower in Nigeria. The site currently runs on diesel at $1.40/L delivered. Local PSH averages 5.5. They want 5 days of battery autonomy for reliability.

Tower load2 kW (24/7)

Location PSH5.5 PSH

Autonomy5 days

Diesel cost$1.40/L

Result

Daily energy48 kWh/day

Solar array12.8 kW (32 × 400W panels)

Battery bank300 kWh LiFePO4

Annual diesel cost~$34,500/yr

CO₂ reduction~13 tons/yr

System cost~$212,000

Payback~6.1 years

With diesel at $1.40/L, this 2kW tower burns $34,500/year in fuel. The solar hybrid system pays back in just over 6 years and saves over $200,000 in diesel costs over 10 years while eliminating generator maintenance visits — often the biggest hidden cost at remote sites.

FAQ

Can solar fully replace diesel generators at telecom towers? ▼

Yes — modern solar + battery systems can fully replace diesel generators at most telecom tower sites. A properly sized system with 3-5 days of battery autonomy handles extended cloudy periods without generator backup. Most operators deploy solar-diesel hybrid systems as a first step: solar handles 80-90% of energy needs, with diesel as emergency backup only. Full off-grid solar is most cost-effective at remote sites where fuel delivery is expensive and unreliable.

How much does a solar telecom tower system cost? ▼

Costs vary widely by tower size and location. A 1kW rural tower system costs $15,000-25,000 including panels, LiFePO4 battery bank, MPPT charge controller, and installation. A 5kW remote site with 5-day autonomy runs $80,000-120,000. Urban macro sites at 10kW are $150,000-250,000. These costs have dropped 70% since 2015 and continue to fall. The key financial metric is payback vs diesel — sites with expensive fuel ($1.50+/L) often see payback under 4 years.

What battery technology is best for telecom tower applications? ▼

LiFePO4 (lithium iron phosphate) is now the standard for telecom tower storage, replacing VRLA lead-acid batteries. LiFePO4 offers 3,000-6,000 cycle life (vs 500-800 for lead-acid), operates in a wider temperature range (-20°C to 60°C), requires zero maintenance, and provides consistent capacity throughout discharge. The higher upfront cost is offset by 5-8x longer life. For harsh tropical or desert environments, battery thermal management (passive or active cooling) is essential to reach rated cycle life.

How many days of battery autonomy do I need? ▼

The industry standard is 3 days for accessible sites and 5-7 days for remote sites. "3 days" covers most extended cloudy periods globally and allows time for a service visit if needed. Remote sites in monsoon regions or at high latitudes may need 7 days. For mission-critical infrastructure (disaster response, military), 7 days with a small diesel backup genset provides the best reliability. More autonomy days means more battery cost but less risk of outage — balance this against your service level agreement requirements.

What is the environmental benefit of solar telecom towers? ▼

A 2kW tower running on diesel emits approximately 13 metric tons of CO2 per year from direct combustion, plus additional lifecycle emissions from fuel production and transport. Converting to solar eliminates ~95% of these emissions. Across a network of 1,000 towers, that's 13,000 tons of CO2 avoided annually — equivalent to removing 2,800 cars from the road. Many telecom operators are now targeting net-zero networks by 2030, and tower electrification is the single biggest lever available.

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