Checklist Compilation for Installing Solar Panels at Home

Key Information. The installation consent and required documents for solar panels differ according to housing type and ownership. The conditions for single-family home roofs and common/shared facilities of multi-family buildings cannot be considered the same.

How to Check. Prepare the building registration and a lease contract, and check the consent process and installation zones with the managing entity or owner. For multi-family units, verify if agreement from the residents' representative council or owners is needed by checking the project announcement.

Practical Tip. Before getting estimates, describe your address and housing type to the Renewable Energy Center's consultation desk to verify the type of support available, reducing unnecessary site visits.

Caution. Using shared spaces based on personal judgment or installing without written consent from the landlord may lead to disputes and restoration issues.

Official Source. You can recheck the standards and specific conditions at the Renewable Energy Center Housing Support FAQ. As rates, subsidies, and product standards may change after July 23, 2026, verify the original document just before contract or purchase.

Key Information. The power generation from solar panels is affected not only by the equipment capacity but also by the roof's orientation, slope, regional sunlight, and obstacles nearby. The same product can yield significantly different results based on the installation location.

How to Check. Verify the azimuth angle, slope angle, and projected monthly generation from the installer’s layout and request the weather data and loss rates used for the estimations. Even if the roof isn't south-facing, compare actual shading and usage patterns together.

Practical Tip. Instead of a single total annual figure, get monthly estimates, including winter and monsoon periods, and placing them next to recent electricity usage makes it easier to judge self-consumption potential.

Caution. Power generation forecasts can change depending on weather, pollution, and temperature, and the installer’s best-case scenarios do not guarantee your home's results. Ensure that overly detailed profit predictions are backed with solid assumptions.

Official Source. You can recheck the latest standards and specific conditions at the Korea Energy Agency Renewable Energy Center. Rates, subsidies, and product standards may change after July 23, 2026, so verify the original document right before any contract or purchase.

Key Information. If shading occurs on part of a panel, it can reduce the output of not only that part but the whole system depending on the connection method. The sun's altitude changes by season, making a single daytime site review insufficient.

How to Check. Take photos of the roof in the morning, noon, and afternoon, marking the shadow paths from chimneys, railings, trees, and adjacent buildings on the layout. Request shading analysis results from the installer and how the modules and inverters will respond.

Practical Tip. Get a simulation that reflects winter's low sun angle, prioritize placement in low-shadow areas, and also note potential future tree growth or new building possibilities.

Caution. Do not arbitrarily remove trees or assume that sunlight from neighboring buildings will continue uninterrupted. Additional devices like optimizers should also be compared for costs, failure points, and effectiveness.

Official Source. You can recheck the latest standards and specific conditions at the Korea Energy Agency Renewable Energy Center. Rates, subsidies, and product standards may change after July 23, 2026, so verify the original document right before any contract or purchase.

Key Information. Solar installations add to the roof's dead load from modules and structures, as well as loads from wind and snow. Drilling and wiring pass-throughs for installation are directly related to leak management.

How to Check. Assess roof materials and aging, and obtain a safety confirmation from a structural expert if necessary. The quote should detail the fixing method, waterproofing specifics, wind load design, and leakage defect liability.

Practical Tip. If roof repairs are due soon, repair first and then compare the total costs of installation with the expenses for panel removal and reinstallation to reduce long-term costs.

Caution. Do not confirm structural safety based on visual assessments alone. Unauthorized drilling or improper fixing can cause not only leaks but also fall risks during high winds.

Official Source. You can recheck the latest standards and specific conditions at the Electric Safety Corporation. Rates, subsidies, and product standards may change after July 23, 2026, so verify the original document right before any contract or purchase.

Key Information. A higher capacity is not always economical, and must align with daytime electricity usage, installation area, and system interconnection conditions. The handling of excess electricity varies according to the contract.

How to Check. Organize the monthly kWh and major daytime loads for the last 12 months and request expected generation, self-consumption, and surplus electricity tables from the installer. Also verify the capacity limits for support projects.

Practical Tip. Divide capacities into plans A, B, and C, and compare initial costs, expected self-consumption rates, and maintenance costs over the same period to avoid over-installation.

Caution. Electricity savings vary depending on tariffs and usage, and multiplying expected generation by the same rate can lead to discrepancies with reality. Also check for future expansion possibilities.

Official Source. You can recheck the latest standards and specific conditions at the Korea Electric Power Corporation Cost Calculator. Rates, subsidies, and product standards may change after July 23, 2026, so verify the original document right before any contract or purchase.

Key Information. To connect solar panels to the household electrical system, you must verify connection feasibility, metering methods, and safety procedures. Installation completion does not necessarily mean normal interconnection.

How to Check. Confirm with the construction company and KEPCO regarding the applying entity, required documents, whether a meter replacement is needed, and expected timelines. Specify who will bear the costs for system interconnection and additional construction in the contract.

Practical Tip. Organizing the dates for installation, inspection, metering work, and operational startup into one table, and receiving completion proof for each stage before paying the final amount, ensures safety.

Caution. Additional construction and delays might occur depending on the capacity of the distribution board or state of the distribution network. Prioritize written confirmations over claims of “always connectable.”

Official Source. You can recheck the latest standards and specific conditions at KEPCO ON. Rates, subsidies, and product standards may change after July 23, 2026, so verify the original document right before any contract or purchase.

Key Information. The inverter is the key device that converts direct current from the panels to alternating current for household use, and it may have a shorter replacement cycle than the modules. Both efficiency and installation environment, as well as service networks, are important.

How to Check. Obtain the exact model names and certification information of the modules, inverters, and connection boxes, and verify them against the official certification list. Compare warranty periods, service fees, replacement time, and remote monitoring conditions as well.

Practical Tip. Keeping product serial numbers on quotes and completion documents and transferring app accounts to the homeowner's name helps track power generation status even after changing companies.

Caution. Confirm whether “long warranty” includes parts, labor, and travel costs. Check that no unauthorized alternatives or changes to models differ from the contract at the completion.

Official Source. You can recheck the latest standards and specific conditions at the Renewable Energy Center KS Certification. Rates, subsidies, and product standards may change after July 23, 2026, so verify the original document right before any contract or purchase.

Key Information. Comparing solar contracts requires looking at not just product prices, but also design, permits, construction, system interconnection, warranty, and demolition responsibilities. Verbal promises are hard to prove in disputes.

How to Check. Verify if the company participates in support projects, check business information, electrical construction qualifications, track record, and insurance. Specify the model, capacity, total amount, additional costs, schedule, defect liability, and termination conditions in the contract.

Practical Tip. Get detailed quotes from at least three companies with the same specifications to identify missing items and compare advance payment ratios and stage payment conditions.

Caution. Be wary of sales tactics that impersonate government agencies or pressure you into contracts by saying “the subsidy will be confirmed if you sign today.” Avoid full payments before support selection or personal account transfers.

Official Source. You can recheck the latest standards and specific conditions at the Renewable Energy Center Business Announcements. Rates, subsidies, and product standards may change after July 23, 2026, so verify the original document right before any contract or purchase.

Key Information. Even after installation, regular monitoring of power generation, wiring, structural appearance, and inverter errors should continue. The sooner you find anomalies, the more you can reduce long-term losses.

How to Check. Record monthly power generation from the app or meter and compare it to the same month last year. If there’s a sudden drop, check error codes, breakers, contamination, and shading, and contact service companies safely.

Practical Tip. Keep a record of standard generation values, emergency contacts, and shut-off procedures received at completion next to the distribution board and document it with your family for quick response in case of malfunctions or emergencies.

Caution. Stepping on panels on the roof or cleaning them with high-pressure washers can lead to electrocution, falls, and product damage. If you notice abnormal smells, sounds, or heat, do not disassemble anything by yourself.

Official Source. You can recheck the latest standards and specific conditions at the Electric Safety Corporation Regular Inspection. Rates, subsidies, and product standards may change after July 23, 2026, so verify the original document right before any contract or purchase.

Key Information. Economic viability should not only consider installation costs minus subsidies but also include financing costs, inverter replacement, inspection, insurance, and roof repairs. The savings can also vary based on usage and rate changes.

How to Check. Create two scenarios, before and after the subsidy confirmation, along with generation maintenance, benchmark, and optimistic scenarios. Write down the annual cash flow for each case and replacement costs over the expected lifespan.

Practical Tip. Instead of just one number for the payback period, create a table to see how changing assumptions affects results, such as a 10% decrease in generation or the occurrence of repair costs.

Caution. Guarantees of profits based on electricity rate increases or maximum generation are not trustworthy. Check the ownership and disposal costs of the equipment before contracts when selling or demolishing the house.

Official Source. You can recheck the latest standards and specific conditions at the Renewable Energy Center Financial Support Guide. Rates, subsidies, and product standards may change after July 23, 2026, so verify the original document right before any contract or purchase.