Backup Generator Sizing
Running watts, starting surge and the derates that decide the rated size — plus the two safety rules that matter more than any of the arithmetic.
Backup generator size
3,712 calculations · browse all
- Generator size for 1000 running watts with a none HP motor on gasoline
- Generator size for 1000 running watts with a 1½ HP motor on diesel
- Generator size for 1500 running watts with a ½ HP motor on natural gas
- Generator size for 1500 running watts with a 3 HP motor on natural gas
- Generator size for 2000 running watts with a 1 HP motor on propane
- Generator size for 2500 running watts with a none HP motor on gasoline
- Generator size for 2500 running watts with a 2 HP motor on gasoline
- Generator size for 3000 running watts with a ½ HP motor on diesel
- Generator size for 3000 running watts with a 3 HP motor on natural gas
- Generator size for 3500 running watts with a 1 HP motor on natural gas
- Generator size for 4000 running watts with a none HP motor on propane
- Generator size for 4000 running watts with a 2 HP motor on gasoline
- Generator size for 4500 running watts with a ¾ HP motor on gasoline
- Generator size for 4500 running watts with a 3 HP motor on diesel
- Generator size for 5000 running watts with a 1 HP motor on natural gas
- Generator size for 5500 running watts with a none HP motor on natural gas
- Generator size for 5500 running watts with a 2 HP motor on propane
- Generator size for 6000 running watts with a ¾ HP motor on gasoline
- Generator size for 6000 running watts with a 5 HP motor on gasoline
- Generator size for 6500 running watts with a 1 HP motor on diesel
- Generator size for 7000 running watts with a none HP motor on natural gas
- Generator size for 7000 running watts with a 2 HP motor on natural gas
- Generator size for 7500 running watts with a ¾ HP motor on propane
- Generator size for 7500 running watts with a 5 HP motor on gasoline
- Generator size for 8000 running watts with a 1½ HP motor on gasoline
- Generator size for 8500 running watts with a none HP motor on diesel
- Generator size for 8500 running watts with a 2 HP motor on natural gas
- Generator size for 9000 running watts with a ¾ HP motor on natural gas
- Generator size for 9000 running watts with a 5 HP motor on propane
- Generator size for 9500 running watts with a 1½ HP motor on gasoline
- Generator size for 10000 running watts with a ½ HP motor on gasoline
- Generator size for 10000 running watts with a 2 HP motor on diesel
- Generator size for 10500 running watts with a ¾ HP motor on natural gas
- Generator size for 10500 running watts with a 5 HP motor on natural gas
- Generator size for 11000 running watts with a 1½ HP motor on propane
- Generator size for 11500 running watts with a ½ HP motor on gasoline
- Generator size for 11500 running watts with a 3 HP motor on gasoline
- Generator size for 12000 running watts with a ¾ HP motor on diesel
- Generator size for 12000 running watts with a 5 HP motor on natural gas
- Generator size for 12500 running watts with a 1½ HP motor on natural gas
- Generator size for 13000 running watts with a ½ HP motor on propane
- Generator size for 13000 running watts with a 3 HP motor on gasoline
- Generator size for 13500 running watts with a 1 HP motor on gasoline
- Generator size for 13500 running watts with a 5 HP motor on diesel
- Generator size for 14000 running watts with a 1½ HP motor on natural gas
- Generator size for 14500 running watts with a ½ HP motor on natural gas
- Generator size for 14500 running watts with a 3 HP motor on propane
- Generator size for 15000 running watts with a 1 HP motor on gasoline