A battery energy storage system earns its keep in one of a few specific ways: cutting the demand charge on a commercial bill, moving cheap energy into expensive hours, holding a site up when the grid drops, or making rooftop solar usable after the sun goes down. Which of those applies to you is an arithmetic question, and it is the first thing we work out — before anyone talks about kilowatt-hours.
Capabilities
Commercial tariffs bill you on your highest half-hour of the month. A battery that discharges across those peaks lowers the billed maximum demand without changing anything about how the plant runs.
For short, frequent outages a battery covers the gap silently, starts instantly and has no fuel line to manage. We model the run-hours honestly, including the cases where the DG still makes more sense.
Rooftop generation peaks at midday; most loads peak either side of it. Storage closes that gap and raises self-consumption instead of exporting at a low feed-in rate.
Power and energy are separate decisions. We size the inverter against your peak and the pack against the duration you actually need, so you do not pay for capacity that never discharges.
LFP chemistry, cell-level monitoring, thermal management and enclosure design reviewed against the fire-safety standards that apply to stationary storage in India.
Remote telemetry on state of charge, cycle count, temperature and throughput, so degradation is something you observe over time rather than discover at end of life.
Where it applies
Stated as the problem first, because the system is only worth specifying once the problem is.
Run the numbers
Every recommendation on this page comes down to arithmetic. Here is the same arithmetic, with your numbers instead of ours — including the cases where the answer is no.
Enter the numbers from a recent electricity bill. The two lines that matter are the demand charge and the gap between your peak and off-peak energy rates.
Estimated saving
An estimate from your inputs, not a quotation. Real savings depend on your load profile through the day — which is the first thing we would ask to see.
Demand charge saving = peak reduction (kVA) × demand charge (₹/kVA/month). This assumes the battery reliably discharges across every interval that would otherwise set the monthly maximum — which is a question about your load profile, not about the battery.
Arbitrage = energy shifted × (peak rate − off-peak rate ÷ efficiency) × operating days. Efficiency is applied to charging, because delivering 1 kWh at peak means buying rather more than 1 kWh off-peak. If your spread is narrow, this term can be zero or negative, and the calculator will say so.
Not included: avoided diesel, power-factor and ToD incentives, avoided production loss during outages, or any degradation of the pack over its life. The first three make the case better; the last makes it slightly worse.
Further reading
Questions
BESS
Send us the bill, the load list or the duty cycle. We will come back with a size, a cost and the arithmetic behind both — including the cases where the answer is that you do not need us.