Rooftop solar savings and payback calculator

It is directional rather than exact, and each part of the calculation carries a different level of confidence. The system size and subsidy arithmetic are reliable, because both follow published, fixed rules that do not vary by household. The savings figure is the part that depends on your specific DISCOM (electricity distribution company) tariff slab, and those slab rates are what we are still actively confirming against the current TGERC and APERC retail supply orders — the official rate filings from Telangana's and Andhra Pradesh's state electricity regulators, periodically revised and not always straightforward to track in real time. That is exactly why every number on this page is shown as a labelled range rather than a single confident figure, along with the date those rates were last verified, so you can judge for yourself how current the underlying assumption is. This is a deliberate design choice rather than a limitation we are hiding: a calculator that presented tariff-dependent savings as a single precise number would be more reassuring to look at, but less honest about what is actually known with confidence at this stage versus what still depends on a rate that regulators can revise.

Because a single number would be a claim we cannot actually support with the information available at this stage. Generation varies with your roof's orientation, tilt and any shading from nearby trees or structures; equipment cost varies by brand, capacity and site-specific installation complexity; and your effective tariff slab varies with how much electricity you consume in a given billing cycle. Any one of these alone could shift the real outcome meaningfully in either direction, and together they mean a single precise figure would be presenting false confidence rather than genuine accuracy. The range shown here is the honest width of what can be said before an engineer has actually seen your roof. A site survey is what narrows that range down to a number specific to your property, which is the only figure worth acting on.

No. The estimate shown above is calculated entirely from what you enter into the calculator and stays visible on the page regardless of whether you go any further. Nothing about seeing that number requires filling in the contact form beneath it. The form exists for a different purpose: requesting the more accurate, site-specific figure that one of our engineers produces after visiting your property in person, checking your roof, shading and existing electrical setup directly rather than relying on the general assumptions a calculator has to make. That in-person figure, not the online estimate, is the number Origian Power actually stands behind once you decide to move forward — the calculator is a starting point for your own research, not a lead-capture requirement. You are free to use the estimate to compare against other quotes, share it with family, or simply decide solar is not right for you yet, all without providing any contact details at all.

Yes. The subsidy shown here is applied specifically to the system size the calculator recommends based on your entered consumption, using the currently confirmed subsidy banding by capacity described on the subsidy page. The result is shown as two separate figures rather than one combined number: the gross system cost before any subsidy, and the net amount you would actually pay after the subsidy is applied — so you can see both what the full system would cost outright and what the government's contribution actually reduces that to, rather than a single blended figure that obscures how much of the saving comes from the subsidy itself versus the system's own generation. Keeping these separate also makes it easier to compare quotes from different installers, since some quotes are presented gross and others net, and conflating the two makes an apples-to-apples comparison harder than it needs to be.

There is no fixed answer independent of your household's actual consumption pattern — a 3kW system tends to suit a lighter domestic load without much daytime air conditioning, while most homes running air conditioning through a significant part of the day land closer to needing a 5kW system to make full use of what they generate. The calculator above works this out directly from your actual electricity bill rather than offering a generic recommendation based on home size or family count, because the economics genuinely depend on matching capacity to consumption in both directions: a 5kW system installed on what is really a 3kW load ends up exporting its surplus at the lower net-metering rate rather than offsetting your own higher-value consumption, while a 3kW system installed on a genuine 5kW load simply leaves real monthly savings unclaimed that a correctly sized system would have captured.