Framework to judge if solar EMI fits your monthly power bill

Why your bill is the anchor

Most solar conversations start with system cost. That is the wrong starting point for a household budget. You do not plan groceries by asking what a year of food costs upfront. You plan month to month.

Your electricity bill is a monthly commitment you have already absorbed. When a solar EMI lands at or below that number, the switch feels less like a new expense and more like redirecting money you were already spending.

This reframing matters because Indian residential tariffs are slab based. The more units you consume, the higher the per unit rate climbs. A family paying ₹5,000 per month is often charged ₹7 to ₹9 per unit at the top slab. Solar generation offsets those expensive top slab units first, which means the effective value of each solar unit is higher than the average tariff.

The four inputs you need

Gather these before you run any numbers. Each one is available without a site visit.

1. Average monthly bill (₹). Take the last 12 months and average them. Summer bills will be higher if you run ACs. Use the average, not the peak.

2. Matching system size (kW). A rough rule: every 1 kW of solar generates about 120 units per month in most Indian cities. Divide your monthly consumption (printed on your bill) by 120 to get an approximate system size.

3. Post subsidy system cost (₹). Under PM Surya Ghar, the subsidy is ₹30,000 per kW for the first 2 kW and ₹18,000 for the third kW, capped at ₹78,000 for systems of 3 kW and above. Subtract this from the gross system cost to get the amount you actually finance.

4. EMI tenure (months). Shorter tenures mean higher EMIs but lower total interest. We offer 12 month no cost EMI (fully interest free), which is uncommon in the category. Standard bank EMI options extend to 24 months, 4 years, or 5 years at prevailing rates.

The decision matrix

The table below walks through three common household profiles. Each row shows how the EMI compares to the existing bill. Use it as a template; swap in your own numbers for a personalized check.

Read the verdict row first. If the EMI for your preferred tenure is equal to or less than your current bill, solar is cash flow neutral. You are swapping one monthly payment for another, except the solar payment ends after the tenure while the electricity bill never stops rising.

How to score your result

After plugging in your numbers, assign yourself one of three outcomes.

Green: EMI is less than your bill. Solar pays for itself from month one. The gap between EMI and bill is money saved immediately. This is the strongest case for going ahead.

Amber: EMI is within 20% above your bill. You pay slightly more per month during the EMI period, but once the loan ends, your electricity cost drops to near zero (only fixed charges remain). Payback happens within the tenure itself.

Red: EMI is more than 20% above your bill. Consider a smaller system size, a longer tenure, or waiting until your consumption (and bill) rises. Rising tariffs in most Indian states mean this gap narrows each year.

What the framework skips

This is a quick affordability filter, not a full financial model. It deliberately leaves out a few things to keep the decision simple at the first stage.

It does not account for annual tariff increases. Most state electricity commissions revise residential tariffs upward every one to three years. Each revision makes the solar offset more valuable, which means your real savings will likely be higher than this static comparison suggests.

It does not model net metering credits in detail. If your system generates more than you consume during the day, surplus units are exported to the grid and adjusted against your bill. The exact credit mechanism varies by state and discom. We help with net metering approvals and can walk you through your specific state's policy during a consultation.

It also does not factor in the generation guarantee. Under our Arkashield guarantee, if the system underperforms, we pay back at ₹7 per unit of shortfall. That backstop protects your savings estimate from underperformance risk.

Making the framework personal

Numbers on a table are useful. Numbers from your own roof are better. Here is how to move from framework to decision.

Pull your last 12 electricity bills. Most discoms now show billing history in their apps or online portals. Calculate the average monthly amount and average monthly units consumed.

Divide units by 120 to get a starting system size. Round to the nearest standard size (2, 3, 4, or 5 kW). If you plan to add an EV charger or another AC in the next two years, size up by 1 to 2 kW.

Subtract the applicable PM Surya Ghar subsidy from the market price range for that system size. Use the ranges in the table above as a reference. Then divide the post subsidy cost by your preferred tenure in months. Compare that EMI to your average bill.

If the result is green or amber, a technical site visit is the logical next step. We schedule an engineer visit within 2 days of booking, and the booking fee is ₹20,000 (adjusted against the final system cost). Installation itself takes 24 to 48 hours once the site assessment is complete.

Why we frame it this way

We believe the biggest barrier to residential solar in India is not technology or even cost. It is the mismatch between how solar is sold (large upfront number) and how households budget (monthly outflow). Our 12 month no cost EMI exists specifically to close that gap. No other player in the category offers a full 12 months interest free.

Combined with PM Surya Ghar subsidy support, MNRE approved components, and a single point of warranty accountability across panels, inverter, and structure, the goal is to make the financial case as transparent as the monthly bill itself.

If you are still unsure, run the four input check above. If the math works on paper, it almost always works on the roof.