Generator Rental vs BuyingROI Calculator (India)

The calculator builds a total cost of ownership (TCO) for three lanes over the same horizon - long-term rental, buying a new CPCB IV+ unit, and buying a certified refurbished used unit (with mandatory RECD retrofit). Each lane is computed using the same fuel curve and the same operating profile so the comparison is apples-to-apples. We pre-load brand-neutral North India market ranges (April 2026) for rental rates, new purchase prices, used prices, and RECD costs, then let you override any number with your actual quote. The output is the TCO for each lane, the year-1 cash hit, the breakeven month between lanes, and a downloadable PDF report.

Renting beats buying for any horizon under roughly 24-36 months for typical industrial loads. The break-even depends on your duty cycle - for 24x7 prime power the payback is faster (12-18 months) because depreciation is amortized over many running hours; for backup-only loads (4-8 hours/day) the payback stretches to 30-48 months. Other factors that push you toward renting: short project duration (construction, plant commissioning, festival peaks), uncertain location, lack of capex headroom, no in-house maintenance team. Run the calculator with your specific months, hours/day, and days/month to see your exact crossover point.

Used certified refurbished costs roughly 35-50% of equivalent new (e.g. a 250 kVA used at Rs 14 L vs Rs 30 L new), so the upfront cash hit is dramatically lower. The trade-offs: (1) you must add RECD retrofit (Rs 4-7 L for 250 kVA) for legal operation in NCR + 131 NCAP cities, (2) AMC cost is typically 4.5% per year vs 2.5% for new, and (3) resale value is lower. Used wins for buyers with horizons of 3-7 years who can absorb higher running costs in exchange for lower upfront. New wins for 8+ year horizons, sites that need full warranty + nationwide service, or applications (hospitals, data centres) where reliability matters most.

RECD stands for Retrofit Emission Control Device. It is mandated by CPCB for diesel gensets manufactured before the CPCB IV+ era (1 July 2023) when they operate in NCR and 131 NCAP-listed non-attainment cities. RECD is essentially a particulate filter + catalyst module that reduces PM, NOx, HC, and CO emissions to acceptable levels. New CPCB IV+ gensets already meet emission norms by design - RECD is built in - so it only needs to be retrofitted on used CPCB II / III units. Costs typically run Rs 1.5-7 L depending on kVA bracket. Alpha Diesels handles the entire RECD retrofit including type-approved hardware, installation, paperwork, and post-fitment compliance verification.

We compiled the pricing tables from public Indian market data (Indiamart listings, dealer rate cards, Sudhir Power, Modern Energy, Aggreko, Sinewave, Powerica, Sterling, Mascus India, OLX Industrial), 2025-2026 quotations, and CPCB-approved RECD vendor price lists. Bands are intentionally wide (low / mid / high) to absorb brand, region, and condition spread. The slider on each pricing card shows where your quote falls in the market range - if your quote is well below the low end or well above the high end, you should ask why. The numbers reflect ex-works equipment cost; GST 18%, mob/demob, and site civil work are extra.

Fuel cost depends only on kVA, load percent, hours per day, days per month, and diesel pump price. The genset's CPCB IV+ SFC curve (~0.27 L/kWh at 75% load) is essentially the same whether the unit is rented, newly bought, or used. So for a fixed kVA and operating profile, fuel cost is identical across the rent / buy-new / buy-used lanes - which means it does not change the relative comparison between them. We still surface fuel because the user wants the absolute monthly running cost, not just the lane-to-lane delta.

If you tell the calculator you would take an equipment loan to buy, we apply a typical SME equipment loan rate of 13% per annum to the purchase price across the evaluation horizon. If you would pay cash, we apply an opportunity cost of 7.5% per annum - this captures what the same money could have earned in a fixed deposit, liquid debt fund, or money-market instrument. Neither number is amortized like a true EMI schedule (we use a simple interest approximation for clarity); for a precise EMI schedule, ask Alpha Diesels for a financing quote with one of our partner banks.

Year-1 cash hit is the upfront cash you actually pay in the first year - the purchase price for buying lanes, or one month's rent + fuel for the rental lane. Even when the long-horizon TCO favours buying, the year-1 cash hit can be 20-40 times higher for the buy lanes than for renting (e.g. Rs 30 lakh vs Rs 75,000 for 250 kVA). Many SMEs cannot or should not deploy that much capex on a single asset, especially when working capital constraints are real. The calculator shows year-1 cash hit prominently so you can compare cash-flow exposure separately from the long-run TCO winner.

Resale value is the hardest number to predict and we offer three scenarios: conservative (15% of new purchase retained), realistic (25%), and optimistic (35%). Indian market data shows working CPCB IV+ Greaves Cotton gensets (with multi-brand service support for KOEL, Cummins, Mahindra) typically retain 20-30% of original value at year 10 with proper AMC, original logbook, and full service history. Used lane resale is multiplied by 0.6 to reflect lower retention on already-refurbished units. If you plan to keep the genset for the full 10-15 year lifespan, resale becomes a small line item; if you may upgrade in 5 years, run the optimistic scenario for a fairer picture.

It does not - the entire pricing table is brand-neutral. We deliberately avoid disclosing our internal Greaves price list and instead show the broader Indian market range so the calculator is useful even if you eventually buy from another OEM. Alpha Diesels is mentioned only as the team that built the tool and as one option for getting a sharper quote (rent, new, or used) once you have a number you want to validate. If you decide to buy from us, we will match or beat the market range you see in the report; if not, the tool still helps you negotiate harder with whichever vendor you choose.

AMC (Annual Maintenance Contract) is optional in the calculator because not every owner buys one. Many SMEs self-service or pay per visit. If you do plan to take an AMC, toggle it on and the calculator will add 2.5% of new purchase price per year (or 4.5% for used, reflecting the higher service intensity of older engines) to the buy lanes. Rentals already include operator + AMC bundled in the monthly rate, so this only changes the buy lanes. Whether AMC is worthwhile depends on your in-house maintenance capability, the criticality of the load, and the OEM's service network in your region.

For preliminary budgeting and decision-making, yes - the methodology and market ranges give you a TCO answer that is within 10-15% of what you would see in a binding quote for typical kVA brackets. For final purchase decisions, especially above 250 kVA or for project-rental contracts, get a written quote. Alpha Diesels will share specific Greaves CPCB IV+ pricing, certified used inventory, and project rental terms tailored to your duration, load, and location - including GST, mob/demob, RECD retrofit (if applicable), AMC plans, and financing options. No email signup required.

GST 18% applies to both rentals and purchases and is not included in the displayed pricing - it is a pass-through that affects all three lanes equally, so it does not change the relative comparison. Mob/demob (mobilization and demobilization of a rental genset to your site) is typically Rs 25-50k for NCR and is excluded from the rental rate. For multi-month rentals it is amortized to a small per-month addition. If you want the calculator to include these, share your specific scenario with our team and we will give you the all-in number. For the current version, treat the displayed TCO as the equipment + financing + fuel + AMC subtotal before GST and logistics extras.