Common Mistakes When Buying Rooftop Solar

Why buying solar goes wrong

Rooftop solar is a large purchase that will sit on your roof for twenty-five years or more. Most people buy it only once, so they have no experience to rely on and little ability to tell a good offer from a poor one. The market also has a wide range of installers, from established companies to one-person operations, and prices and quality vary a great deal.

Most bad outcomes come from a short list of avoidable mistakes. Knowing them will not make you an engineer, but it helps you ask better questions, compare offers fairly and walk away from deals that feel wrong.

Mistake 1: Choosing on the lowest price alone

A quotation that is far cheaper than the others usually has a reason. It may use lower-quality panels or an undersized inverter, thinner cables, a weaker structure, no earthing or surge protection, or it may exclude items such as net metering fees. Sometimes the price is low because the company plans to cut corners during installation.

Compare quotations line by line, not just by the total. Ask the installer to show the brand and model of each major component, the rated wattage and the warranty. If one offer is much lower, ask exactly what is different. An offer that omits protective equipment costs more in the end if you have to pay to fix it later.

Mistake 2: Skipping the site survey

A quotation sent by phone or message without anyone visiting your roof is a guess. Real conditions such as shade, roof strength, direction, available area, the state of the wiring and the position of the meter all affect the right design and cost. A survey catches problems early, when they are cheap to solve.

Insist on a visit by someone who understands the work, not only a salesperson. They should measure, photograph and ask about your usage, and they should be able to explain their recommendation using your own bills.

Mistake 3: Vague or verbal paperwork

Verbal promises are hard to enforce when a problem appears. Your quotation should say clearly what you are buying: system capacity, number and type of panels, inverter details, structure, cables, earthing, protection, warranty periods, who handles net metering and subsidy paperwork, and the payment schedule. If an assurance matters to you, ask for it in writing.

Be careful with phrases like complete solution or all-inclusive when no list follows. Ask what is not included, such as extra cabling, civil work, roof repairs or DISCOM charges, so there are no surprises later.

Mistake 4: Paying everything upfront

With a large advance paid, you have little leverage if the work is delayed or poor. A fairer arrangement is a modest advance when you sign, a further payment when the equipment is delivered, another after installation, and the balance after commissioning and inspection. Keep a receipt for every payment, and pay by traceable methods.

If you are claiming a subsidy, remember that it arrives later, so plan your cash flow. Be wary of anyone who asks you to pay the subsidy amount to them or to an agent, or who promises a guaranteed subsidy date.

Mistake 5: Ignoring the inverter and the details around it

Buyers often compare panel brands and ignore the inverter, even though it is the component most likely to fail or need service. A low-cost inverter with a short warranty and no local service can cost more over twenty-five years than a better one. Also check the quality of cables, connectors, the mounting structure and the earthing, because failures at these points cause most of the real-world problems.

Ask for the details of each component and compare. A good installer shows why a particular choice suits your site and budget, and does not tell you to stop worrying about it.

Mistake 6: Forgetting after-sales support

Solar needs little care, but not none. At some point you will have a question, an inverter error or a storm-damaged cable. Choose an installer who has a local office or a reliable team nearby, a service phone number that works and a record of looking after earlier customers. Ask existing customers whether the company answered when they called.

Also check how long the company has been operating and whether it is likely to be around when the warranty is needed. A very new business with an attractive price is not necessarily a bad choice, but you should look more closely at its references and paperwork.

• Ask for addresses of installations you can visit.
• Ask how quickly they respond to service calls.
• Check whether they are registered for the subsidy scheme in your DISCOM area.
• Keep the service number and the warranty papers together.

A quick pre-purchase checklist

Before you pay anything, go through this list. If every answer is yes, you are well placed to buy.

• I have compared at least two written quotations, line by line.
• Someone has visited and surveyed my roof and connection.
• I know the brand, model and warranty of the panels and inverter.
• Earthing and protection are included and listed.
• Payment is in stages tied to milestones.
• I know who handles net metering and subsidy paperwork.
• I have the installer's service contact and references.

Mistake 7: Believing guarantees that sound too good

Claims like zero electricity bill forever, guaranteed payback in two years or free solar should make you cautious. Real savings depend on your usage, the size of the system, the weather, your tariff and how exported units are credited. A responsible installer shows the assumptions behind their estimate and explains that results vary.

Ask for the estimate in writing, with the expected yearly generation, the tariff used and the saving it produces. Then check it against your own bills. Do not trust a number the salesperson cannot explain, however confident they sound.

Mistake 8: Not checking subsidy eligibility before you buy

Many buyers choose a system and only later discover that their connection, roof or system type does not qualify for the subsidy they expected. Eligibility depends on being a residential consumer, installing a grid-connected system through a registered vendor, and following the order of steps on the portal.

Before you commit, read the official scheme page, ask your installer to show you how your case qualifies and write down the conditions. If a salesperson promises a subsidy amount, verify it on the official portal, because the rules and amounts can change.

What to do if you have already signed a poor deal

If you realise a mistake after signing, act early. Read your agreement for cancellation and refund terms, write to the company describing the problem, and keep copies of all messages and receipts. Ask for the missing items or corrections in writing and set a reasonable deadline.

If the company does not respond, you can approach consumer forums or the relevant authorities, and if a subsidy or net metering application is involved, tell the DISCOM or portal helpline with your application number. Keep your records in order, since each of these steps relies on them.