How to use the Generator Run-Time Savings Calculator
The Formula
We compare hybrid kWh available (solar kW × sun hours × 75% efficiency + 85% of battery kWh per day) against energy implied by today's generator hours (~3.5 kW electrical while running). The overlap fraction becomes hours you no longer need on the genset.
Practical Example
Savings = hours saved × your $/engine-hour. Life extension uses a 5,000-hour planning life: slower annual hours push overhaul/replacement further out.
About Generator Run-Time Savings Calculator
How hours saved are estimated
We compare hybrid kWh available (solar kW × sun hours × 75% efficiency + 85% of battery kWh per day) against energy implied by today's generator hours (~3.5 kW electrical while running). The overlap fraction becomes hours you no longer need on the genset.
Maintenance and life
Savings = hours saved × your $/engine-hour. Life extension uses a 5,000-hour planning life: slower annual hours push overhaul/replacement further out.
Frequently asked questions
Q: Include fuel? A: This tool is maintenance-focused—use Generator vs Solar Hybrid for fuel OPEX. Q: Oversized solar? A: Offset caps at 100% of current gen energy. Q: Backup sizing? A: Pair with Home Backup Battery Sizing for essential loads.