What Can a Generac Generator Run?
Learn what a Generac standby generator can power, from essential circuits to managed whole-home backup.
One of the most common questions homeowners ask before buying a standby generator is: what will it actually power? The answer depends on the size of the generator, how your electrical panel is configured, and whether you choose essential-circuit backup or whole-home backup. This guide explains the options clearly.
Essential-Circuit Backup
An essential-circuit generator — typically in the 11 kW to 16 kW range — is connected to a load-management transfer switch that powers your most important circuits rather than your entire home. This approach reduces the required generator size and installed cost while still protecting what matters most.
Common essential circuits include:
- ▸Furnace or heat pump
- ▸Sump pump
- ▸Refrigerator and freezer
- ▸Lighting in key areas
- ▸Internet router and modem
- ▸Medical equipment
- ▸Well pump (if applicable)
Whole-Home Backup
A whole-home standby generator — typically 20 kW or larger — powers your entire electrical panel, including high-draw appliances like central air conditioning, electric ranges, electric water heaters, and EV chargers. With a whole-home system, your household operates normally during an outage.
Generac's PWRmanager and load-management systems can also allow a smaller generator to power a larger home by intelligently cycling high-draw appliances so the generator is never overloaded.
Common Household Systems and Their Load Requirements
| System | Approximate Load |
|---|---|
| Gas furnace (blower) | 600–900 W |
| Central air conditioner (3-ton) | 3,500–5,000 W |
| Sump pump (1/2 HP) | 800–1,050 W |
| Well pump (1 HP) | 1,000–2,000 W |
| Refrigerator | 150–400 W |
| Chest freezer | 100–400 W |
| Internet router/modem | 10–30 W |
| CPAP machine | 30–60 W |
| Electric range (one burner) | 1,200–2,500 W |
| Electric water heater | 4,000–5,500 W |
Note: Actual loads vary by appliance age, efficiency rating, and operating conditions. A site-specific assessment is the most accurate way to determine the right generator size for your home.
Mobile Link Remote Monitoring
Every Generac standby generator includes Mobile Link WiFi connectivity, which allows you to monitor generator status, receive maintenance alerts, and check exercise cycle history from your smartphone. This is especially useful for vacation homes, rental properties, or homeowners who travel frequently.