| sun-hours.default | 4 hours per day | যাচাই হয়নি | Al-Noman et al., Global Journal of Earth Science and Engineering https://avantipublishers.com/index.php/gjese/article/download/1725/1183/10492 (4.0-6.0 kWh/m2/day); Dornier/Suntrace Market Brief https://dornier-group.com/app/uploads/sites/5/2019/09/Market_Brief_Bangladesh-1.pdf (4-4.5 peak sun hours); Springer https://link.springer.com/10.1186/s40807-016-0027-3 (4.5-4.8 kWh/m2/day, modelled); De Gruyter https://www.degruyterbrill.com/document/doi/10.1515/EHS-2023-0089/html (about 4-6.5, via search summary) | 2026-11-13 | About 4 to 5 peak sun hours (4-6 kWh/m2/day agrees across independent sources) is confirmed as a range only; the default of 4 is the conservative end and our own pick. SREDA and Global Solar Atlas values NOT FOUND. |
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| efficiency.default | 86 percent | একাধিক সূত্রে মিলেছে | NREL PVWatts https://nrel.gov/docs/fy19osti/74097.pdf ; https://webarchive.library.unt.edu/web/20170124203116/http://www.nrel.gov/docs/fy14osti/62641.pdf | 2026-11-13 | PVWatts default total system losses of 14% (derate about 0.86). A vendor guide gives 10-12% loss for well-kept systems and 16-20% for difficult sites (SurgePV, single-source). A Bangladesh-specific performance ratio was NOT FOUND. |
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| dod.lead-acid | 50 percent | একটি সূত্রে পাওয়া | Anern Store https://www.anernstore.com/blogs/off-grid-solar-solutions/lead-acid-vs-lifepo4-battery-sizing-off-grid ; Patsnap https://eureka.patsnap.com/article/battery-sizing-for-off-grid-solar-lithium-vs-lead-acid-compared ; Solar Builder https://solarbuildermag.com/featured/how-to-replace-lead-acid-batteries-with-lithium-batteries/ (vendor and trade sources, read via search summaries) | 2026-11-13 | About 50% for lead-acid. The research file marks this CONFIRMED (several vendor and trade sources agree) but they are not an official standard, so it is labelled single-source here for caution. A forum suggests subtracting about 10% from claimed depth when sizing (unconfirmed). |
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| dod.lithium | 80 percent | একটি সূত্রে পাওয়া | Anern Store https://www.anernstore.com/blogs/off-grid-solar-solutions/lead-acid-vs-lifepo4-battery-sizing-off-grid ; Patsnap https://eureka.patsnap.com/article/battery-sizing-for-off-grid-solar-lithium-vs-lead-acid-compared ; Solar Builder https://solarbuildermag.com/featured/how-to-replace-lead-acid-batteries-with-lithium-batteries/ (vendor and trade sources, read via search summaries) | 2026-11-13 | About 80-90% for lithium (LiFePO4); the low end (80) is used. Vendor and trade sources, not an official standard. |
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| voltage.default | 12 V | যাচাই হয়নি | Load Shedding Management Guide https://bdbillcalculator.netlify.app/blog/load-shedding-management-guide ; Techxzon https://www.techxzon.com/product-category/electrical-equipment/ips/solar-inverter/ (Bangladesh retailer blogs, not official) | 2026-11-13 | 12 V is used in the research examples (100 Ah is roughly 1,200 Wh at 12 V); a simple starting choice. 24 V and 48 V are also offered. |
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| inverter-margin.default | 50 percent | একটি সূত্রে পাওয়া | Load Shedding Management Guide https://bdbillcalculator.netlify.app/blog/load-shedding-management-guide ; Techxzon https://www.techxzon.com/product-category/electrical-equipment/ips/solar-inverter/ (Bangladesh retailer blogs, not official) | 2026-11-13 | Bangladesh retailer blog rule of thumb: inverter VA at least 1.5 times the connected load (so a 50% margin). VA and W are not distinguished; not an official rule. |
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| preset.ceiling-fan | 120 W | যাচাই হয়নি | EWEB https://www.eweb.org/documents/energy-efficiency/cost-of-use-common-household-appliances-and-electronics.pdf ; FirstEnergy https://www.firstenergycorp.com:443/content/dam/customer/get-help/files/savingenergy/Understanding-Electricity-Use-Cost-TE.pdf (US utility tables, read through search summaries only; not Bangladesh-specific) | 2026-11-13 | Midpoint of 65-175 W from one utility table; an Energy.gov typical average of about 35 W is also cited. Sources differ widely and Bangladesh BLDC fans differ. Approximate; edit the watts to match your appliance. |
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| preset.led-bulb | 11.5 W | একাধিক সূত্রে মিলেছে | EWEB https://www.eweb.org/documents/energy-efficiency/cost-of-use-common-household-appliances-and-electronics.pdf ; FirstEnergy https://www.firstenergycorp.com:443/content/dam/customer/get-help/files/savingenergy/Understanding-Electricity-Use-Cost-TE.pdf (US utility tables, read through search summaries only; not Bangladesh-specific) | 2026-11-13 | Midpoint of about 10-13 W for a 100 W equivalent LED bulb (two sources agree on the range). Approximate; edit the watts to match your appliance. |
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| preset.refrigerator | 160 W | একটি সূত্রে পাওয়া | EWEB https://www.eweb.org/documents/energy-efficiency/cost-of-use-common-household-appliances-and-electronics.pdf ; FirstEnergy https://www.firstenergycorp.com:443/content/dam/customer/get-help/files/savingenergy/Understanding-Electricity-Use-Cost-TE.pdf (US utility tables, read through search summaries only; not Bangladesh-specific) | 2026-11-13 | Midpoint of 150-170 W running for an ENERGY STAR refrigerator. Approximate; edit the watts to match your appliance. |
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| preset.tv | 161.5 W | একটি সূত্রে পাওয়া | EWEB https://www.eweb.org/documents/energy-efficiency/cost-of-use-common-household-appliances-and-electronics.pdf ; FirstEnergy https://www.firstenergycorp.com:443/content/dam/customer/get-help/files/savingenergy/Understanding-Electricity-Use-Cost-TE.pdf (US utility tables, read through search summaries only; not Bangladesh-specific) | 2026-11-13 | Midpoint of 110-213 W for a 45 inch LED/LCD TV. Approximate; edit the watts to match your appliance. |
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| preset.air-conditioner | 1200 W | একটি সূত্রে পাওয়া | EWEB https://www.eweb.org/documents/energy-efficiency/cost-of-use-common-household-appliances-and-electronics.pdf ; FirstEnergy https://www.firstenergycorp.com:443/content/dam/customer/get-help/files/savingenergy/Understanding-Electricity-Use-Cost-TE.pdf (US utility tables, read through search summaries only; not Bangladesh-specific) | 2026-11-13 | Midpoint of 1,000-1,400 W for a room air conditioner. Approximate; edit the watts to match your appliance. |
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| preset.water-pump | 373 W | একটি সূত্রে পাওয়া | EWEB https://www.eweb.org/documents/energy-efficiency/cost-of-use-common-household-appliances-and-electronics.pdf ; FirstEnergy https://www.firstenergycorp.com:443/content/dam/customer/get-help/files/savingenergy/Understanding-Electricity-Use-Cost-TE.pdf (US utility tables, read through search summaries only; not Bangladesh-specific) | 2026-11-13 | About 373 W for a 1/2 HP water pump (single value in the table). Approximate; edit the watts to match your appliance. |
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| preset.other-appliances | — | মান পাওয়া যায়নি | research/solar-battery/research.md (no researched value found) | 2026-11-13 | Phone charger, laptop, iron, rice cooker and microwave: no verified watt value found. The visitor types the watts. |
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| backup-hours.default | — | মান পাওয়া যায়নি | research/solar-battery/research.md (no researched value found) | 2026-11-13 | No researched backup-hours default; the field starts empty. |
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| monthly-kwh.default | — | মান পাওয়া যায়নি | research/solar-battery/research.md (no researched value found) | 2026-11-13 | No researched monthly-units default; the field starts empty (the visitor reads it from the electricity bill). |
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| sun-hours.regional | — | মান পাওয়া যায়নি | research/solar-battery/research.md (no researched value found) | 2026-11-13 | Division-wise sun-hour values were not found; one national default is used and the visitor can change it. |
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