New
Solar Savings Calculator
Monthly savings, payback period & ROI from solar installation.
CostNest Calculator
Solar Panel Calculator Bangladesh
Calculate how many solar panels you need, total system size in kWp, and estimated installation cost. Supports grid-tied, off-grid, and hybrid systems. Accurate for Bangladesh — works globally too. No account needed — numbers update as you type.
Step By Step
How to Use the Solar Panel Calculator Bangladesh
8 steps
- Select your system type — Grid-Tied, Off-Grid, or Hybrid.
- Set the quantity of each appliance you want to run on solar.
- Enter any additional loads in total watts.
- Set how many hours per day those appliances run.
- Choose your panel wattage from the dropdown.
- Set peak sun hours (BD default: 5.0) and your local currency.
- Enter installation cost per watt for total system cost.
- Read the four tiles: Load · System Size · Panels Needed · Cost.
Worked Example
Worked Example for Solar Panel Calculator Bangladesh
Use this sample to sanity-check your inputs and understand what the final result represents.
- 14 fans (75W) + 8 LEDs (10W) + 1 TV (80W) + 1 fridge (150W) = 760W load
- 2Running 10 hours/day → 7.6 kWh/day
- 3Peak sun: 5 hrs · System efficiency: 80%
- 4Required: 7.6 ÷ (5 × 0.8) = 1.9 kWp
- 5Using 400W panels: 5 panels needed
Final Result
Result: 5 × 400W · 2.0 kWp · Cost ~৳140,000 · CO₂ offset ~950 kg/year
Methodology
Solar Panel Calculator Bangladesh Formula & Methodology
This section explains the calculation logic, assumptions, and source material used to make the result more trustworthy and easier to verify.
Daily energy: Load (W) × Hours ÷ 1000 = kWh/day. Required kWp: Daily kWh ÷ (PSH × 0.80). Panels needed: ⌈Required kWp × 1000 ÷ Panel W⌉. System cost: Actual kWp × 1000 × Price/watt. CO₂ offset: Monthly kWh × 12 × 0.682 kg/kWh. 0.682 kg CO₂/kWh = BD grid emission factor (SREDA 2023). 0.80 = system derate factor (IEC 61724).
Practical Guidance
Solar Installation Tips for Bangladesh
- 1Use 400W or 450W monocrystalline panels — best efficiency-to-price ratio in the BD market 2025–26.
- 2Face panels south at a 23° tilt angle — Bangladesh's latitude is 20–26°N, so south-facing at latitude angle maximises annual output.
- 3Check your roof's load-bearing capacity before installation — 400W panels weigh 20–22 kg each and mounting adds 5–10 kg/m².
- 4For inverters, use trusted brands: Growatt, Solis, Huawei, or Victron. Avoid unbranded inverters — they fail first and void warranties.
- 5For batteries, lithium (LiFePO4) lasts 10–15 years; lead-acid lasts 3–5 years. Lithium costs more upfront but has much lower total cost over system life.
- 6Always buy panels with a 25-year power output guarantee and 12-year product warranty — verify with the manufacturer, not just the dealer.
- 7Get at least 3 quotes from SREDA-registered installers — prices vary 20–30% between companies for the same system size.
- 8Clean panels monthly — a thin layer of dust can reduce output by 5–15% in Bangladesh's dry season.
Frequently Asked Questions
How many solar panels does a typical Bangladeshi home need?+
An average urban apartment in Bangladesh (4 fans, 8 LED lights, 1 TV, 1 fridge) uses roughly 7–10 kWh per day. Using 400W panels and 5 peak sun hours with 80% system efficiency, you typically need 5–8 panels (a 2–3.2 kWp system). Air-conditioned homes (1–2 ACs) may need 12–20 panels for a 5–8 kWp system.
What is the cost of solar installation in Bangladesh in 2025–26?+
A complete rooftop solar system costs approximately ৳65–90 per watt installed (2025–26 market rate, SREDA-tracked). A 3 kWp grid-tied system costs ৳195,000–270,000 fully installed including panels, inverter, mounting, and wiring. Hybrid systems with lithium batteries cost 30–50% more. Off-grid with lead-acid batteries are cheaper upfront but have higher replacement costs every 3–5 years.
What does 'peak sun hours' mean and what is Bangladesh's value?+
Peak sun hours (PSH) is the number of hours per day when sunlight intensity equals 1,000 W/m² — the standard test condition for solar panels. Bangladesh receives 4.5–5.5 PSH daily on average, measured by the Bangladesh Meteorological Department. Sylhet and Chittagong receive slightly more than Dhaka. This calculator defaults to 5.0 PSH, a conservative estimate suitable for most of Bangladesh.
Grid-tied vs off-grid vs hybrid — which is better for Bangladesh?+
Grid-tied is cheapest (no battery cost) and best if you have reliable BPDB power and net metering approval. Off-grid suits areas with frequent long power cuts or no grid access — requires batteries sized for backup duration. Hybrid (battery + grid + solar) is most practical for urban Dhaka homes — you get backup power during load shedding and reduce your monthly bill. Most urban installations in Bangladesh are now hybrid.
What is BPDB net metering and how do I apply in Bangladesh?+
Net metering allows grid-tied solar customers to sell surplus electricity back to the BPDB grid, offsetting their bills. The BPDB net metering rate is set periodically and is typically lower than the retail rate. To apply: contact your local BPDB/DPDC/DESCO office, submit a net metering application with system specifications, install a bidirectional meter (supplied by BPDB), and get system certification from a licensed installer. The process takes 1–3 months. SREDA (Sustainable and Renewable Energy Development Authority) oversees the policy.
What is the typical payback period for a solar panel system in Bangladesh?+
A 3 kWp hybrid system typically pays back in 4–7 years in Bangladesh depending on: your current electricity tariff (higher bills = faster payback), the system cost per watt, and local peak sun hours. At ৳10–12/unit electricity rates and ৳70/watt installed cost, payback is usually 5–6 years. After payback, panels produce free electricity for 20+ more years. The ROI is typically 15–25% per year.
What does the 80% system efficiency factor mean?+
Solar panels are rated under ideal lab conditions. In real-world installation, energy is lost at several points: the inverter (DC to AC conversion) loses ~5%, wiring and connections lose ~2–3%, soiling and shading lose ~2–5%, and temperature derating in Bangladesh's hot climate (panels lose ~0.35–0.45% efficiency per °C above 25°C) costs another 5–8%. The 80% (0.80) factor combines these losses. More conservative estimates use 75%.