Time-of-Day (ToD) Electricity Tariffs Are Coming

For decades, residential electricity consumers in India paid a flat rate per unit consumed regardless of the time of day. But under the Ministry of Power's revised Electricity Rules, Time-of-Day (ToD / Dynamic Peak-Off-Peak) Tariffs are rolling out nationwide alongside Smart Prepaid Meters.

Under ToD pricing, electricity consumed during sunny daytime hours is discounted by 20%, while electricity consumed during evening peak hours (6:00 PM to 10:00 PM) carries a steep 20% to 35% surcharge. Here is why this tariff revolution changes the economics of residential Solar + Battery Energy Storage (BESS) forever.

The Peak-Hour Tariff Dilemma

Most working families are away from home during the day when rooftop solar generates 100% of its power. In the evening, when family members return home to turn on air conditioners, lights, and appliances, grid electricity rates hit maximum surcharge pricing.

• Standard Day Solar Solar Generation: 9:00 AM – 4:00 PM (Low Tariff Solar Window)
• Peak Household Consumption: 6:00 PM – 11:00 PM (High Surcharge Grid Window)

How Hybrid Inverters & LiFePO4 Batteries Unlock Arbitrage Profit

A modern Hybrid Solar System with Lithium Iron Phosphate (LiFePO4) Battery Storage operates as a smart energy arbitrage engine:

1. Daytime: Solar powers immediate house loads, and all surplus energy charges the high-efficiency 5kWh or 10kWh lithium battery bank.
2. Evening Peak (6 PM – 10 PM): When grid rates jump to ₹10–₹12/unit, the smart hybrid inverter disconnects from the grid and discharges stored daytime solar power to run heavy AC and domestic loads for zero surcharge cost!
3. Night Off-Peak: If needed, batteries top up from the grid at discounted night tariff rates.