Nankharia Energy · Sizing Tool
Solar Battery Storage Calculator
Enter your solar capacity to see the regulatory bracket you fall under, the minimum battery size that applies, and an indicative savings and payback estimate. Works for any capacity — from a small rooftop system to a large industrial installation.
Your system
kW
kWh
Used only to sanity-check your battery discharge against real usage.
hours
Maharashtra’s mandate requires a minimum of 2 hours. The 10-year duty exemption (captive projects only) requires at least 4 hours covering 50% of capacity. Set your own budget-driven value — 2.5h, 4.5h, whatever fits.
Advanced assumptions
₹
/ unit
Your full peak-window grid tariff (including surcharges). Every unit you discharge from the battery instead of drawing from the grid at this rate is a direct saving.
₹
/ unit
Used only to estimate the 10-year duty exemption saving for captive projects with ≥4-hour storage. Adjust to your applicable duty rate.
₹
/ kWh
Installed cost per kWh of storage, including inverter and integration.
days
Regulatory Status
—
Min. Battery Power
— kW
Min. Battery Energy
— kWh
Units shifted / month
—
Est. monthly saving
—
Est. annual saving
—
Indicative payback
—
This calculator gives a directional estimate for planning purposes based on the assumptions shown under “Advanced assumptions.” It does not account for battery degradation, financing costs, or your exact tariff order. For a proposal built on your actual 12-month billing data, share your bills with our team and we’ll model exact numbers.