Solar for mosques in Bangladesh: five prayer peaks, two of them in the dark

By Vvon Engineering Team | Published 2026-01-27 | Updated 2026-09-13

A mosque load curve is five spikes a day, and fajr and isha fall when the array produces nothing. What that means for sizing, for battery backup during Tarawih, and for a roof with a dome and a minaret on it.

Solar EPC & street lighting RFQ checklist (TXT)

A mosque does not have a load curve like a factory. It has five spikes a day, and two of the five sit in complete darkness. Fajr is before sunrise and isha is well after sunset, which means the array contributes nothing at all to either. Any proposal that quotes a mosque's annual bill against an annual generation figure and calls the difference a saving has skipped the only question that matters here.

Record lighting, fans, air conditioning, sound and water-pumping use together with the mosque's bills. Attached teaching or community activities can change the daytime profile.

Where the load actually falls

Zuhr, asr and Friday activities can overlap with generation, but clouds, prayer time, system size and load determine the actual direct use and import/export. Do not assume those services are always fully supplied by PV.

Ramadan moves through the solar calendar. Model its actual evening loads for the planning period rather than assuming an increasingly hot season. If outage support is required, specify fans, lights and other supported circuits, transfer limits and autonomy separately from bill savings.

The roof, the dome and the minaret

Assess the roof's structural capacity and usable area around domes, tanks and access routes. Model moving minaret shadows across the year; an RCC slab is not automatically suitable for the added system.

• Survey the shadow, not the roof plan. Plot the minaret and dome shadows at winter and summer sun angles, then place the array and split the strings to reduce mismatch within the equipment's electrical limits.
• Do not put modules on the minaret. It is tempting because it is high and unshaded. It is also the worst place for wind load, for access and for lightning protection, and it usually cannot be maintained without scaffolding.
• Small neighbourhood masjids are often tin on light purlins. Check the purlin spacing and the condition of the fixings before quoting a mounting structure, and expect to add purlins rather than to drill more holes.
• Every roof penetration needs a verified waterproofing detail over a prayer hall with a plastered ceiling. Insist on the sealing detail in writing and inspect it after the first heavy rain.
• Plan the cable route and the earthing early, including lightning protection where there is a tall minaret, and keep the inverter somewhere ventilated, lockable and reachable that is not the roof surface itself.

What a mosque plant is worth

Input	Evidence needed	Why it matters
Consumption	Twelve months of bills and representative interval demand	Separates direct use, exports and changing demand.
Generation	Location, layout, weather dataset and loss assumptions	Estimates output month by month.
Connection	Sanctioned load, transformer and utility requirements	Establishes eligible capacity and approval conditions.
Installed cost	Dated itemised quotation and exclusions	Includes roof work, connection and commissioning.
Operating cost	Maintenance, insurance and replacement assumptions	Avoids treating later electricity as cost-free.

Model daylight use and export from the mosque's actual operating schedule. Any adjacent madrasa, clinic or market load can be counted only within the approved electrical and metering arrangement.

Paying for it

Compare outright funding, a documented community contribution and any written finance offer. The committee should check ownership, waqf or other property conditions, repayment and maintenance obligations. Do not assume monthly savings cover instalments.

• Use a measured financial case before allocating expected savings to other activities.
• Agree any environmental or community reporting with the committee.
• Confirm utility and electrical permission before supplying separate facilities.
• Define the evening backup service and budget if storage is proposed.

One practical point for committees: whichever route is chosen, write the maintenance responsibility into the same resolution that approves the purchase. A mosque plant with no named person responsible for cleaning and for the annual inspection will quietly lose output, and committees change.

Sources and project checks

Consult the relevant edition and the documents for the exact equipment and site: Power Division / SREDA: Net Metering Guidelines 2025, English; US Department of Energy: battery energy storage procurement checklist; IEC 62548-1: PV array design requirements.

Have a project to scope?

Share your application, equipment requirements and procurement timeline. Our engineers can help clarify the configuration and scope for your enquiry.

Discuss your requirements

Browse buying and selection guides | Back to all Insights