How to use the Off-Grid Generator vs. Solar Hybrid Calculator
The Formula
Generator-only cost = daily fuel (from kWh ÷ ~2.8 kWh/L) × 365 + maintenance. Hybrid adds upfront capex but assumes ~88% of energy from solar+battery, with ~12% backup fuel.
Practical Example
Generators look cheap to buy but burn fuel forever. Hybrid shifts spend to equipment; cumulative curves cross when fuel savings repay the install.
About Off-Grid Generator vs. Solar Hybrid Calculator
How the comparison works
Generator-only cost = daily fuel (from kWh ÷ ~2.8 kWh/L) × 365 + maintenance. Hybrid adds upfront capex but assumes ~88% of energy from solar+battery, with ~12% backup fuel.
CAPEX vs. OPEX
Generators look cheap to buy but burn fuel forever. Hybrid shifts spend to equipment; cumulative curves cross when fuel savings repay the install.
Frequently asked questions
Q: Include generator purchase? A: Model existing genset OPEX only—add purchase price to hybrid side if replacing hardware. Q: Cloudy weeks? A: Adjust backup fraction in advanced planning; 12% is a moderate off-grid default.