Propane Generator Run Time Calculator
Here’s a comprehensive table summarizing all you need to know about propane generator run times:
| Generator Size | Propane Consumption | Run Time (20 lb tank) | Run Time (120 gal tank) | Run Time (500 gal tank) |
|---|---|---|---|---|
| 7.5 kW | ~0.87 gal/hr | ~5 hours | 138 hours | 574 hours |
| 16 kW | ~2 gal/hr | ~2.3 hours | 59 hours | 246 hours |
| 20 kW | ~2.4 gal/hr | ~1.9 hours | 50 hours | 210 hours |
| 22 kW | ~2.5 gal/hr | ~1.8 hours | 48 hours | 197 hours |
Additional Information
Factors Affecting Run Time:
- Generator size and power output
- Load demand (percentage of generator capacity being used)
- Efficiency of the generator
- Size of the propane tank
- Ambient temperature and weather conditions
Calculating Propane Consumption:
- Calculate horsepower: (watts / 1000) x 2
- Determine BTU/hr: horsepower x 10,000
- Calculate propane consumption: BTU/hr / 92,000 = gallons per hour
Propane Tank Sizes:
- 20 lb tank: Contains approximately 4.6 gallons
- 120 gallon tank: Recommended for short outages (1-2 days)
- 500 gallon tank: Suitable for extended outages (8-10 days)
General Guidelines:
- Average household generators consume 2-4 gallons of propane per hour3.
- A 1000-gallon propane tank can run a generator for about 200-400 hours (8.3-16.7 days) at typical consumption rates1.
- For whole-house Generac automatic standby units, a 500-gallon propane tank is often recommended3.
Tips for Optimal Generator Use:
- Regular maintenance ensures efficient fuel consumption
- Use only the necessary appliances during outages to extend run time
- Consider a dual-fuel generator for flexibility in fuel sources
- Consult with a certified installer for precise sizing and tank recommendations
Remember that these figures are estimates and actual run times may vary based on specific conditions and generator models. It’s always best to consult with a professional for the most accurate information tailored to your specific needs.