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Grid Bill Offset
Monthly bill offset from a solar system.
FinancialCore inputs only — quick sizing with engineering defaults.
Inputs (SI units)
Results
Save & Load Project
Designs are stored privately in this browser — nothing is uploaded.
Engineering Formula
- Consumption offset = min(gen×self%, bill/tariff)
- Savings = offset × tariff
- Export credit = gen × (1 − self%) × feed
Behind-the-meter savings equal displaced tariff units. Surplus feeding the grid earns the feed-in rate. Net saving is the sum.
Step-by-step Calculation
- 1.Units billed
Bill/Tariff889 kWh - 2.Self-used
Gen × self%600 kWh - 3.Savings
min×Tariff + export×FiT₹ 5,850
Design Assumptions
- • Uniform tariff (no slabs).
- • No demand charges.
Engineering Tips
- ◆Move heavy loads to daylight for higher self-consumption.
- ◆TOU tariffs typically improve payback by 10–15%.
Warnings
- ▲Net metering caps vary by state — check DISCOM policy.
Standards & References
CERC / SERC net-metering regulations
Related Solar Calculators
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Lifetime GHG savings from displaced grid electricity.
Net Metering Credit
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Reducing-balance EMI for solar financing.
Diesel Generator Savings
Fuel and money saved by displacing DG with solar.
ROI & Payback Period
Simple payback, ROI and lifetime net savings of a PV plant.
LCOE (Levelised Cost)
Discounted levelised cost of energy over the plant life.