Vyut is an electric energy block that sits beside your existing DG set. Chhote power cuts battery legi. Lambe cut genset lega, jaise aaj leta hai. You are never asked to bet uptime on a battery.
The battery takes over in under 20 milliseconds. Itni jaldi ki machine ko pata bhi nahi chalta. No restart, no scrap batch, no waiting while the genset cranks.
Ek diesel unit costs about ₹27.70 all in. Wahi unit, grid se kharid kar battery mein rakha hua, ₹11.61 ka. Short power cuts are most of your fuel bill, aur ab woh sasti bijli par chalte hain.
Vyut sits upstream of your changeover and takes the short cuts. Lamba cut aaya to genset apne aap start hota hai, bilkul aaj ki tarah. Fire pump, lift, sab kuch waise ka waisa.
We do not guess. Aapke genset ka start counter batata hai ki power cut kitni baar aate hain aur kitni der ke hain. Usi se battery ka size nikalta hai. Ginti free mein, das minute mein, data aapka.
Prismatic lithium iron phosphate: no cobalt, no nickel, no thermal runaway cascade. 6,000 cycles ka matlab hai tereh saal ki machine. Cell-level monitoring, liquid cooling, rack-level fault isolation. Poora technical detail neeche Specs mein hai.
Most power cuts are short. A one-hour battery takes roughly half of all the energy your genset makes in a year, because most cuts end long before the hour is up. Chasing the long ones costs two and a half times the money for a worse return, so we do not chase them. That is the genset’s job, and it is already paid for.
Of the energy your genset makes in a year, roughly half comes from short power cuts. The battery takes all of those in full.
Long cuts are rarer but run for hours. That is the genset’s job, and we will never present it as the battery’s.
The genset stays commissioned, fuelled and under AMC. Fire pump and lift code obligations are unaffected.
A unit from your genset costs about ₹27.70 once fuel, oil and maintenance are counted. The same unit, bought from the grid and stored in the battery, costs about ₹11.61. Every other figure on this page follows from that difference.
Per kWh displaced. Diesel at ₹95.20/l and 0.27 l/kWh at 60% load, plus ₹2.00/kWh operating cost. Grid at ₹10.00/kWh landed, 90% round-trip, plus ₹0.50/kWh battery O&M, less a ₹1.00/kWh credit for the longer overhaul interval. The spread includes that credit, which is why it exceeds the simple difference. The battery also draws a few kilowatts for cooling and controls while it waits for the next power cut, about 3 kW at the reference site; that standby power is charged at the landed tariff and is already deducted from every saving and payback on this page.
Installed and commissioned, at a ₹30 lakh a month plant clearing its power cut frequency threshold. Larger plants do a little better: approvals, the study and commissioning cost much the same at any size.
At about 460 equivalent full cycles a year against 6,000 cycles of usable life to 80% state of health.
Demand-charge shaving and time-of-day arbitrage are left out of every figure here. Each payback is a floor. If you already have rooftop solar, there is a second pool underneath it: see below.
If there is an array on your roof you have watched this happen: bijli gayi, solar bhi gaya. The hours you burn the most expensive power of the year are the same hours your own roof produces nothing. That is not a fault in your plant, and no amount of maintenance fixes it.
Anti-islanding. A grid-tied inverter is required to shut down within about two seconds of losing the grid, so it cannot keep a line live that a lineman has every reason to believe is dead. Every inverter sold in India does this. It is a safety requirement, and it is not something you switch off.
An alternator cannot absorb power pushed back into it. The moment your array makes more than the factory is drawing, the set is being driven instead of driving. Most sites with both are simply told to keep the solar off whenever the generator is running, and that instruction is correct as things stand.
It holds the reference, and it takes the surplus. A grid-forming battery presents the voltage and frequency your inverters are looking for, and absorbs whatever the array sends past the load. The array cannot tell that apart from the utility, so it carries on producing straight through the power cut.
A 600 kWp array on the Reference B site. About a third of its power cut hours fall inside the generation window, and today every one of those kilowatt hours is thrown away. Held up by the battery, they are not.
The battery has to be recharged whatever happens. Doing it inside the solar window turns a unit you were exporting at a low tariff into one you keep. At 15% of generation exported today, on a ₹3 export rate against a ₹10 landed tariff.
Added to the ₹1.01 Cr the same site already saves on diesel. The headline payback we quote you stays the diesel-only one, because that is what the guarantee settles against. This sits underneath it.
Solar co-location is an engineering question with three specific answers, and we would rather find them at the survey than in the proposal.
Both streams are excluded from the guaranteed saving. The guarantee is settled monthly on metered displaced diesel kilowatt hours, and we are not going to write a commitment against your weather.
The calculator takes your array size, your export rate and the share you export today, and reports the solar streams separately from the diesel case.
The economics turn on how often your grid actually fails, not on how much diesel you burn. Two plants with identical fuel bills can be a 1.8-year payback and a 3.4-year one. No public data source can settle that for an individual site. Half of India's distribution companies publish no interruption data at all, and those that do exclude the short events that start your genset. So we measure, at our cost, before anyone signs anything.
Our calculator, run on belt averages and your diesel spend. Enough to decide whether the site is worth a visit.
No cost · no commitmentWe start with the records you already have: the controller's lifetime start counter, the DG logbook, your fuel invoices. A logger goes on the changeover only where those leave a gap. You keep the data whether or not you buy.
Our cost · no commitmentThe model re-run on your measured events, your invoiced diesel and your landed tariff. The guarantee is written on those numbers.
Fixed price · guarantee issuedDeployment and commissioning in one week on site, subject to stock. Then monthly settlement on metered displaced kWh. Miss the guarantee and we pay the difference.
Settled monthlyWe are early. Rather than dress that up, here is exactly what stands behind the numbers on this page, where each figure comes from, and what is still unmeasured.
The configuration is proven in India. AmpereHour Energy commissioned 1.5 MW / 4 MWh behind the meter at Cummins in Phaltan, Maharashtra, in February 2025, doing emergency backup and peak shaving at an operating plant. Not our project. It is why we know the category works.
Every figure here comes from a model that reproduces a published diesel displacement study to within rounding, and is re-checked by an automated test suite on every release. The method is on this page, not behind a sales call.
We track CEA Chapter XA, the battery storage safety rules notified in March 2026 and in force from April 2027, and the Haryana Electrical Inspectorate approvals that gate energisation. Your installation should not be the place these are discovered.
We have no completed installation to show you. We will not present modelled figures as delivered results, and we will not quote your site until we have read your own meters.
Modelled on real belt data, installed and commissioned rather than equipment alone. Use them to judge whether your site is in range. Your own figures come from your meters in stage 02.
Press shop on an NCR industrial feeder. Frequent short interruptions, most under an hour. Genset kept for the long tail and for the fire pump.
Two shift operation with motor loads and process cooling. Same power cut profile as A, twice the ticket. Larger plants return a little faster, because the fixed costs of approval and commissioning spread further.
Fewer but longer interruptions, averaging two hours. Sized to a longer discharge. The genset carries proportionally more of the tail.
A 40 minute session for plant heads, energy managers and CFOs, run by our engineering team. No product demo.
One 1C system per power class. Power block sized to your load during a power cut; energy block always one hour.
| Parameter | PD 220 | PD 445 | PD 720 |
|---|---|---|---|
| Power block | 220 kW | 445 kW | 720 kW |
| Energy block, one hour | 220 kWh | 445 kWh | 720 kWh |
| Energy block, two hour | 440 kWh | 890 kWh | 1,440 kWh |
| C-rate | 1.0C or 0.5C, chosen from your measured power cut duration | ||
| Suits a diesel spend of | ≈₹5 L/mo | ≈₹10 L/mo | ≈₹16 L/mo |
| Chemistry | Prismatic lithium iron phosphate (LFP) | ||
| Usable cycle life | 6,000 cycles to 80% state of health | ||
| Round-trip efficiency | 90% AC to AC, including the power conversion system | ||
| Transfer time | <10 ms, so motor contactors do not drop out | ||
| Thermal management | Liquid-cooled, rack-level fault isolation | ||
| Interface | Upstream of the DG changeover; islanded, non-exporting by default | ||
| Metering | Dedicated energy meter at the point of displacement. Settlement is metered, not modelled | ||
| Typical lead time | 4 weeks from first call to commissioned, where units are in stock | ||
Six inputs. It identifies your distribution licensee from the site PIN, loads today's diesel price for that belt, and shows the full working, including the conditions under which it advises against proceeding.