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.
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.
Bangladesh has over 300,000 mosques, from small neighbourhood masjids to large congregational mosques serving thousands of worshippers. Most mosques pay monthly electricity bills for lighting, ceiling fans, air conditioning, sound systems, and water pumps. For larger mosques with air conditioning, monthly bills can reach BDT 20,000–50,000.
Zuhr and asr land in the strongest part of the generating day, so the fans, the lights and the sound system at those two prayers are covered directly by the array with nothing exported and nothing bought. Maghrib arrives as generation collapses. Fajr and isha have none. The best single match a mosque has is Jumu'ah: the largest congregation of the week, with every fan running and the air conditioning at full load, sitting at midday on a Friday, which is precisely when the roof is producing most.
Ramadan pulls the other way. Iftar, isha and Tarawih are consecutive evening loads, in a month that increasingly falls in hot weather, and they are all after dark. If the committee's real complaint is that the fans stop during Tarawih when load-shedding hits, a larger array does not solve it. Battery storage does, sized for the evening prayers rather than for the whole night, which is a much smaller and cheaper battery than most people assume. Decide which problem you are solving, a bill or an outage, before anyone quotes.
Most purpose-built mosques in Bangladesh have an RCC roof, which is structurally the easiest surface to work with. The complication is what stands on it. The usable area is not the building footprint: a dome, roof-top water tanks, parapet walls and stair headroom all take space, and the minaret casts a moving shadow that traces a different arc across the roof in December than it does in June. On a factory shed a shading study is routine. On a mosque it decides the layout, because a single string running under the minaret shadow for two hours a day drags the whole string down with it.
| Mosque size | Monthly bill | Solar plant | Monthly saving | Payback |
|---|---|---|---|---|
| Small masjid (200 worshippers) | BDT 3,000–5,000 | 5 kWp | approx. BDT 3,000–4,000 | 3–4 years |
| Medium mosque (500 worshippers) | BDT 8,000–15,000 | 15 kWp | approx. BDT 8,000–12,000 | 3.5 years |
| Large mosque (1,000+ worshippers) | BDT 20,000–50,000 | 40 kWp | approx. BDT 20,000–30,000 | 4 years |
| Jame mosque with AC | BDT 50,000–1,00,000 | 100 kWp | approx. BDT 55,000–75,000 | 4–5 years |
Those bands assume the daytime load is genuinely there to absorb the generation. A mosque that is largely empty and unlit between prayers has a smaller daytime load than its bill suggests, and the surplus only has value if the connection is net-metered and the distribution company has approved it. Where an attached madrasa, a clinic or a market runs through the day, the match improves considerably, and that is worth checking before deciding the plant size.
Many mosques in Bangladesh operate on limited budgets. Vvon Technologies can structure solar projects for mosques through several financing approaches: outright purchase (mosque committee pays upfront, owns the system); community fundraising (solar as a community waqf project); or instalment payment arrangements where monthly savings cover the instalment cost. In many cases, the monthly solar savings exceed the monthly instalment payment, meaning the mosque pays nothing extra while building an asset.
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.