Telecom Solar Power & Battery Sizing Calculator

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Engineering inputs

Set the engineering assumptions and design parameters.

1. Site load

Telecom equipment

Telecom hours/day

Transport equipment

Transport hours/day

Cooling load

Cooling hours/day

Auxiliary load

Auxiliary hours/day

2. PV array design

Peak sun hours

Module rating

Base system efficiency

Dust loss

Temperature loss

Wiring loss

Controller loss

Design margin

Modules per string

pcs

3. Battery sizing

Base backup autonomy

Consecutive low-solar days

days

DC system voltage

Allowed DOD

Battery efficiency

Battery safety margin

Existing PV capacity

kWp

Existing battery capacity

kWh

4. Supply scenario & economics

Supply scenario

Electricity tariff

currency/kWh

PV CAPEX

currency/kWp

Battery CAPEX

currency/kWh

Grid carbon factor

kgCO₂/kWh

Generator yield

kWh/L

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Engineering results

Review calculated capacity, limits and design checks.

Site energy summary

Daily load—

Average load—

Net PV efficiency—

PV & battery recommendation

Required PV—

Module count—

Stringing—

Nominal battery—

Battery Ah—

Existing PV gap—

Existing battery gap—

Generation & supply balance

Daily generation—

Annual generation—

Solar coverage—

Daily surplus / deficit—

Grid / generator supplement—

Extra continuous load from surplus—

Economics & emissions

Annual energy saving value—

Simple payback—

Estimated CO₂ reduction—

Equivalent diesel avoided—

Engineering notes

Required PV kWp = Daily Load × Design Margin ÷ (PSH × Net Efficiency)

Use results for preliminary telecom-site sizing and option comparison. Detailed design must also verify module Voc/Vmp against controller limits, monthly irradiation, extreme temperature, vendor battery discharge curves, generator efficiency, voltage drop, lightning protection and redundancy.

Engineering references & boundaries

Content reviewed: 2026-09-10

Authoritative references

Engineering FAQ

How is required PV capacity estimated?

The calculator divides daily site energy, including design margin, by peak-sun hours and the combined PV derating factor.

How should peak-sun hours be chosen?

Use location-specific monthly or annual solar-resource data. For critical telecom sites, check the weak-solar season rather than relying only on an annual average.

How are cloudy days reflected in battery sizing?

Configured cloudy days add 24 hours of average site load per day to the base backup-autonomy requirement before DOD and battery-efficiency corrections.

Can I reuse an existing -48 V battery bank?

Enter its usable/nameplate capacity consistently with the design assumptions. The tool reports the remaining capacity gap, but vendor discharge curves still govern final approval.

Does this replace detailed PV electrical design?

No. Detailed design must still verify module string voltage, controller limits, temperature, protection, cable loss, battery discharge curves and site redundancy.