How to Calculate the Right Solar System Size for Your Needs — And Estimate Installation Space

When someone considers switching to solar, one of the first questions they face is: "What size solar system do I actually need?" Whether an individual is planning an off-grid setup for complete energy independence or an on-grid system to reduce electricity bills, getting the size right is essential for both efficiency and cost-effectiveness.

At Eastman, the process has been simplified through user-friendly Load Calculators, designed to save users from complex manual calculations and help them plan smarter.


Sizing an Off-Grid Solar System

An off-grid solar system powers a home or business entirely independently from the utility grid. The system must cover daily energy consumption and provide backup power for days without sunlight.

For example, if someone wants to power an independent weekend home using Eastman’s solar panels and lead-acid batteries, they should first calculate their daily watt-hour requirement, consider peak loads for high-powered devices, and choose autonomy days—typically 2–3 days for battery backup. By using Eastman's durable deep cycle lead-acid batteries, reliable storage capacity for energy needs can be ensured.

If manual calculations are not preferred, users can go directly to the calculation using Eastman's Load Calculator.

Sizing an On-Grid Solar System

On-grid systems are directly connected to the utility grid and are easier to size compared to off-grid setups. For instance, a small business in Gurugram installing Eastman’s high-efficiency solar panels and an Eastman on-grid inverter should first review annual electricity usage, check local peak sun hours, apply a derate factor, and calculate the number of panels needed.

Alternatively, users can skip the number crunching and use the On-Grid Load Calculator.

Planning Installation Space

Once the system size is determined, the next step is planning for space. A 1 kW solar setup typically requires 80–100 square feet of shadow-free rooftop space. By choosing Eastman’s compact solar modules, efficiency can be maximized even in limited spaces.

Final Thoughts

Sizing a solar system does not have to be overwhelming. Whether planning an off-grid installation or connecting to the grid, Eastman's Load Calculators make it easy to map out the system that fits any lifestyle.

With Eastman’s wide range of solar panels, inverters, and batteries, users are always equipped with reliable solutions backed by years of industry expertise.

They are encouraged to explore the Load Calculators to get started and bring their solar plans to life—the smart way

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