Solar Panel Installation for Homes: A Complete Beginner's Guide

Thinking about putting solar panels on your roof but not sure where to start? This guide walks through the basics — how rooftop solar works, how to work out what size you need, which type of system suits you, and what to expect during installation.

How Rooftop Solar Works

A rooftop solar system has a few main parts:

• Solar panels convert sunlight into direct current (DC) electricity.
• An inverter converts DC into alternating current (AC), the type of electricity your home uses.
• A mounting structure holds the panels at the right angle and height.
• Protection devices, cabling and earthing keep the system safe.
• A net meter (for grid-connected systems) records electricity drawn from and exported to the grid.

During the day, your home uses solar power first. If the panels produce more than you need, the surplus can be exported to the grid; at night, or when generation is low, you draw from the grid as usual. With net metering, exported units are accounted for in your bill as per the applicable rules.

Understanding Your Household Electricity Consumption

Your electricity bill is the starting point. Look for the number of units (kWh) consumed in the billing period — not just the amount payable, which also includes fixed charges and taxes.

• Collect bills for a summer month and a winter month, because AC and cooler use changes consumption a lot.
• Note your sanctioned load (in kW) shown on the bill — it can affect the system size you are allowed to connect.
• Think about changes ahead: a new AC, an electric vehicle or more family members will increase demand.

Factors Affecting System Size

A simple way to estimate size is to divide your average monthly units by the expected monthly generation of 1 kW. In Uttar Pradesh, a well-placed 1 kW system may produce roughly 110–135 units a month. So a home using about 360 units a month might look at a system of around 3 kW.

That number then gets adjusted for:

• Roof space: about 80–100 sq. ft. of shadow-free area per kW, depending on panel size and layout.
• Shading: nearby buildings, trees, water tanks and parapets reduce output.
• Sanctioned load and net-metering rules of your distribution company.
• Budget and whether you want battery backup.

Try our solar savings calculator for a quick indicative size, or see the sizing table on our residential solar page.

On-Grid, Off-Grid and Hybrid Systems

For most city homes with a reasonably reliable supply, an on-grid system is the simplest starting point. If power cuts are frequent and backup matters, a hybrid system is worth discussing.

Is Your Roof Suitable?

• Direction: south-facing areas generally give the best year-round output in India; east–west layouts can also work.
• Shade-free hours: the panel area should get direct sun for most of the day.
• Structure: RCC roofs are common and suitable; older roofs should be checked for condition and waterproofing.
• Terrace use: elevated structures keep the space below usable.
• Ownership: on shared roofs, you need permission from the owner or society.

Installation Steps

1. Consultation and bill review to estimate size.
2. Site survey to check roof area, shading, structure and cable routes.
3. Design and quotation, listing components and scope of work.
4. Applications for net metering (and any scheme you are eligible for).
5. Installation of structure, panels, inverter, protection and earthing — often a few days for a typical home.
6. Inspection, net-meter installation and commissioning by the distribution company.
7. Handover with guidance on monitoring and upkeep.

Maintenance Considerations

• Clean panels regularly with water and a soft brush — more often in dusty months.
• Clean early in the morning or in the evening, not on hot panels at midday.
• Watch the inverter display or app for errors or a drop in generation.
• Keep the panel area free of new shade, such as growing trees or new structures.
• Schedule periodic checks of wiring, earthing and the structure.

Read more on our maintenance and support page.

Frequently Asked Questions

Next Steps

If you are in Kanpur, Lucknow, Ayodhya or Unnao, our team can help you turn this into a concrete plan. Start with the residential solar service, check the PM Surya Ghar subsidy guide, or contact us.