Compare Energy Costs in Real-Time

Panels generate during daylight. Without a battery, any surplus you cannot use at that moment exports to the grid or is wasted. A battery stores that surplus and releases it in the evening or during peak-tariff hours, so you buy less expensive grid power. The calculator uses your Solar Offset percentage to work out how many monthly units come from solar, then prices the remaining draw at your entered tariff rate.

Commercial electricity bills include a demand charge set by your single highest-consumption moment in the billing period, not by total units used. One spike from machines starting together can raise your demand charge for the whole month. A battery discharges during those moments so the grid never sees the spike. The Sanctioned Power field represents the contracted load the battery needs to protect against.

Grid electricity prices vary by time of day under time-of-use tariffs. Off-peak power costs less. A battery charges at the cheap period and discharges when power is expensive, so you effectively buy low and use high. The Electricity Tariff you enter is your average blended rate. A well-managed ESS pulls your effective rate below that number by shifting purchases to cheaper windows.

A diesel genset produces power at roughly Rs 15 to Rs 22 per kWh once you account for fuel price, engine efficiency (typically 3 to 4 kWh per litre), and annual maintenance. An ESS pulling grid power at Rs 7 to Rs 10 per kWh is already 40 to 50 percent cheaper before any solar is added. The calculator converts your Diesel Price and Fuel Efficiency inputs into a true cost-per-unit figure and uses that as the baseline all other systems are compared against.