cost to install solar panels on a (about 66 m²)** roof
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Writer AndyKim
Hit 1,368 Hit
Date 25-02-03 14:04
Content
Below is a **general, approximate** overview of what it might cost to install solar panels on a (about 66 m²)** roof, along with estimates of electricity generation and potential financial returns. Exact figures will vary by country, local labor costs, incentive programs, and specific equipment chosen. The information here is based on **typical global averages** and may differ from actual quotes in your region.
---
## 1. System Size on a 20평 (66 m²) Roof
- For a standard, **efficient** crystalline silicon solar panel (with efficiency around 18%–21%), you can usually install about **7–10 kW** on a 66 m² area.
- Panel wattage and roof geometry (orientation, tilt, shading) can affect the final system capacity.
> **Example**:
> - If each panel is around 400 W and requires ~2 m², you could fit ~33–35 panels for a system size near 13–14 kW *only if* the roof layout is optimal. In many real cases, space constraints (gaps, obstructions) reduce the effective area, making an **8–10 kW** system more common.
---
## 2. Typical Installed Costs by Manufacturer
Below are **approximate** total installed costs (materials + labor + balance-of-system) for a solar array in the **7–10 kW** range, broken down by a few well-known panel makers. These figures assume an average global market (e.g., in the U.S. or parts of Europe/Asia), but **local prices** can vary significantly.
1. **LG** (South Korea)
- **Panel Quality**: Premium/high-efficiency.
- **Estimated Installed Cost**: ~USD **1.20–1.40 per W**.
- **7 kW System**: ~USD **8,400–9,800** total.
- **10 kW System**: ~USD **12,000–14,000** total.
2. **Hanwha Q CELLS** (South Korea/Germany)
- **Panel Quality**: Mid-range to premium.
- **Estimated Installed Cost**: ~USD **1.00–1.20 per W**.
- **7 kW System**: ~USD **7,000–8,400** total.
- **10 kW System**: ~USD **10,000–12,000** total.
3. **Hyundai Energy Solutions** (South Korea)
- **Panel Quality**: Good efficiency, reliable.
- **Estimated Installed Cost**: ~USD **1.00–1.10 per W**.
- **7 kW System**: ~USD **7,000–7,700** total.
- **10 kW System**: ~USD **10,000–11,000** total.
4. **LONGi / Jinko / Trina** (China)
- **Panel Quality**: Wide range, from budget to high-efficiency models.
- **Estimated Installed Cost**: ~USD **0.90–1.10 per W**.
- **7 kW System**: ~USD **6,300–7,700** total.
- **10 kW System**: ~USD **9,000–11,000** total.
> **Note**: These are **very rough** figures that assume standard rooftop installation, standard racking, and standard inverters. **Premium** or **specialized** installations (e.g., difficult roof angles, battery storage, microinverters, etc.) can increase costs by **10%–30%** or more.
---
## 3. Estimated Annual Generation
- Solar output depends on **sunlight (irradiance) in your region**, roof orientation, tilt, and efficiency losses.
- A rough rule of thumb is **1,100–1,300 kWh** per year per kW of installed capacity in many moderate-latitude locations.
> **Example**:
> - A **10 kW** system might generate around **11,000–13,000 kWh** per year under favorable conditions.
> - A **7 kW** system might generate **7,700–9,100 kWh** per year.
In South Korea, for instance, a figure around **1,200 kWh per kW** annually is a common assumption, though actual production can be somewhat higher in sunnier regions or lower if shading/angles are suboptimal.
---
## 4. Potential Financial Returns
### a) Electricity Bill Savings (Self-Consumption)
- If you use most of the solar-generated electricity directly (self-consumption), your savings depend on your **residential electricity rate**.
- In many countries, the residential rate could range from **USD 0.10 to 0.25 per kWh**.
- **Example**: At **USD 0.15 per kWh**, a 10 kW system producing 12,000 kWh/year =
\- Annual savings: 12,000 kWh × 0.15 = **USD 1,800** per year in electricity cost offset.
### b) Feed-in Tariff (FiT) or Net Metering
- In some regions, you can **export surplus** solar energy to the grid at a set rate:
- **Net Metering**: You get credited at retail or slightly below retail rate.
- **Feed-in Tariff**: A guaranteed price (sometimes higher than retail, sometimes lower) for every kWh exported.
- If the FiT or net metering rate is around **USD 0.10–0.15 per kWh**, your **annual income** from a 10 kW system might be in the **USD 1,200–1,800** range (assuming you export most of it).
### c) Payback Period / Return on Investment
- **Payback period** = (Total System Cost) ÷ (Annual Savings or Annual Profit).
- **Example** (10 kW, ~USD 10,000–12,000 installed):
\- Annual savings of ~USD 1,500–2,000
\- Payback in **5–8 years** if local incentives/support are robust.
- After the system pays for itself, you benefit from **low-cost (or near-free) electricity** for the remainder of the panels’ lifespan (often 25+ years).
---
## 5. Other Considerations
1. **Roof Suitability**
- Structural integrity (ensure it can handle panel weight).
- Minimal shading from trees, neighboring buildings, or roof structures (chimneys, vents).
2. **Incentives and Rebates**
- Government rebates, tax credits, or low-interest loans can **significantly reduce upfront costs**.
- Renewable energy certificates (RECs) or additional local grants may be available in some regions.
3. **Maintenance**
- Solar panels are relatively low-maintenance (no moving parts), but **annual cleaning** and **periodic inspections** are advised.
- Inverters may require replacement after ~10–15 years, which is a cost to factor in over the system’s lifespan.
4. **Battery Storage**
- Integrating batteries can boost self-consumption and provide backup power, but it **raises upfront costs** by 30% or more.
- Economic viability depends on electricity rates, incentive structures, and how much backup power you need.
---
## Summary
- **20평 (66 m²) roof** can typically hold a **7–10 kW** solar system, depending on panel layout and efficiency.
- **Installed costs** (turnkey) range roughly from **USD 0.90–1.40 per W** for reputable brands, so a 10 kW system might cost between **USD 9,000–14,000**.
- Annual production for a 10 kW system can be **11,000–13,000 kWh**, yielding **USD 1,200–2,000** in yearly savings or FiT income (assuming rates of USD 0.10–0.15+ per kWh).
- Typical **payback periods** are around **5–10 years**, with a potential lifespan of **25+ years** for panels.
Your actual numbers will depend on **local conditions**, electricity tariffs, incentives, and the specific panel/inverter brands you choose. It’s best to consult with a **local solar installer** for a precise site survey, shading analysis, and cost/benefit estimate tailored to your property.
---
## 1. System Size on a 20평 (66 m²) Roof
- For a standard, **efficient** crystalline silicon solar panel (with efficiency around 18%–21%), you can usually install about **7–10 kW** on a 66 m² area.
- Panel wattage and roof geometry (orientation, tilt, shading) can affect the final system capacity.
> **Example**:
> - If each panel is around 400 W and requires ~2 m², you could fit ~33–35 panels for a system size near 13–14 kW *only if* the roof layout is optimal. In many real cases, space constraints (gaps, obstructions) reduce the effective area, making an **8–10 kW** system more common.
---
## 2. Typical Installed Costs by Manufacturer
Below are **approximate** total installed costs (materials + labor + balance-of-system) for a solar array in the **7–10 kW** range, broken down by a few well-known panel makers. These figures assume an average global market (e.g., in the U.S. or parts of Europe/Asia), but **local prices** can vary significantly.
1. **LG** (South Korea)
- **Panel Quality**: Premium/high-efficiency.
- **Estimated Installed Cost**: ~USD **1.20–1.40 per W**.
- **7 kW System**: ~USD **8,400–9,800** total.
- **10 kW System**: ~USD **12,000–14,000** total.
2. **Hanwha Q CELLS** (South Korea/Germany)
- **Panel Quality**: Mid-range to premium.
- **Estimated Installed Cost**: ~USD **1.00–1.20 per W**.
- **7 kW System**: ~USD **7,000–8,400** total.
- **10 kW System**: ~USD **10,000–12,000** total.
3. **Hyundai Energy Solutions** (South Korea)
- **Panel Quality**: Good efficiency, reliable.
- **Estimated Installed Cost**: ~USD **1.00–1.10 per W**.
- **7 kW System**: ~USD **7,000–7,700** total.
- **10 kW System**: ~USD **10,000–11,000** total.
4. **LONGi / Jinko / Trina** (China)
- **Panel Quality**: Wide range, from budget to high-efficiency models.
- **Estimated Installed Cost**: ~USD **0.90–1.10 per W**.
- **7 kW System**: ~USD **6,300–7,700** total.
- **10 kW System**: ~USD **9,000–11,000** total.
> **Note**: These are **very rough** figures that assume standard rooftop installation, standard racking, and standard inverters. **Premium** or **specialized** installations (e.g., difficult roof angles, battery storage, microinverters, etc.) can increase costs by **10%–30%** or more.
---
## 3. Estimated Annual Generation
- Solar output depends on **sunlight (irradiance) in your region**, roof orientation, tilt, and efficiency losses.
- A rough rule of thumb is **1,100–1,300 kWh** per year per kW of installed capacity in many moderate-latitude locations.
> **Example**:
> - A **10 kW** system might generate around **11,000–13,000 kWh** per year under favorable conditions.
> - A **7 kW** system might generate **7,700–9,100 kWh** per year.
In South Korea, for instance, a figure around **1,200 kWh per kW** annually is a common assumption, though actual production can be somewhat higher in sunnier regions or lower if shading/angles are suboptimal.
---
## 4. Potential Financial Returns
### a) Electricity Bill Savings (Self-Consumption)
- If you use most of the solar-generated electricity directly (self-consumption), your savings depend on your **residential electricity rate**.
- In many countries, the residential rate could range from **USD 0.10 to 0.25 per kWh**.
- **Example**: At **USD 0.15 per kWh**, a 10 kW system producing 12,000 kWh/year =
\- Annual savings: 12,000 kWh × 0.15 = **USD 1,800** per year in electricity cost offset.
### b) Feed-in Tariff (FiT) or Net Metering
- In some regions, you can **export surplus** solar energy to the grid at a set rate:
- **Net Metering**: You get credited at retail or slightly below retail rate.
- **Feed-in Tariff**: A guaranteed price (sometimes higher than retail, sometimes lower) for every kWh exported.
- If the FiT or net metering rate is around **USD 0.10–0.15 per kWh**, your **annual income** from a 10 kW system might be in the **USD 1,200–1,800** range (assuming you export most of it).
### c) Payback Period / Return on Investment
- **Payback period** = (Total System Cost) ÷ (Annual Savings or Annual Profit).
- **Example** (10 kW, ~USD 10,000–12,000 installed):
\- Annual savings of ~USD 1,500–2,000
\- Payback in **5–8 years** if local incentives/support are robust.
- After the system pays for itself, you benefit from **low-cost (or near-free) electricity** for the remainder of the panels’ lifespan (often 25+ years).
---
## 5. Other Considerations
1. **Roof Suitability**
- Structural integrity (ensure it can handle panel weight).
- Minimal shading from trees, neighboring buildings, or roof structures (chimneys, vents).
2. **Incentives and Rebates**
- Government rebates, tax credits, or low-interest loans can **significantly reduce upfront costs**.
- Renewable energy certificates (RECs) or additional local grants may be available in some regions.
3. **Maintenance**
- Solar panels are relatively low-maintenance (no moving parts), but **annual cleaning** and **periodic inspections** are advised.
- Inverters may require replacement after ~10–15 years, which is a cost to factor in over the system’s lifespan.
4. **Battery Storage**
- Integrating batteries can boost self-consumption and provide backup power, but it **raises upfront costs** by 30% or more.
- Economic viability depends on electricity rates, incentive structures, and how much backup power you need.
---
## Summary
- **20평 (66 m²) roof** can typically hold a **7–10 kW** solar system, depending on panel layout and efficiency.
- **Installed costs** (turnkey) range roughly from **USD 0.90–1.40 per W** for reputable brands, so a 10 kW system might cost between **USD 9,000–14,000**.
- Annual production for a 10 kW system can be **11,000–13,000 kWh**, yielding **USD 1,200–2,000** in yearly savings or FiT income (assuming rates of USD 0.10–0.15+ per kWh).
- Typical **payback periods** are around **5–10 years**, with a potential lifespan of **25+ years** for panels.
Your actual numbers will depend on **local conditions**, electricity tariffs, incentives, and the specific panel/inverter brands you choose. It’s best to consult with a **local solar installer** for a precise site survey, shading analysis, and cost/benefit estimate tailored to your property.