Generator Sizing Scenarios
Choosing the right generator starts with understanding your specific power needs. We have pre-calculated generator size recommendations for over 30 common scenarios, from basic power outage essentials to comprehensive whole-house coverage, construction sites, medical equipment, and specialty applications. Each scenario includes a detailed appliance list, wattage breakdown, and specific generator type recommendations.
Browse the scenarios below organized by generator size tier. Small generators under 3 kW are ideal for camping and basic essentials. Medium generators from 4 to 7 kW cover home office backup and basic whole-house needs. Large generators from 8 to 12 kW handle well pumps, sump pumps, and multiple high-draw appliances. Extra-large generators above 13 kW provide full whole-house coverage including central air conditioning and heavy power tools.
If none of these scenarios exactly match your needs, use the interactive calculator on the homepage to select your specific appliances and get a custom generator size recommendation. You can also use these scenarios as starting points and add or remove appliances based on your actual household or job site requirements.
All Scenarios by Generator Size
| Scenario | Appliances | Running Watts | Peak Watts | Recommended |
|---|---|---|---|---|
| Power Outage Essentials | 5 | 1,095 W | 1,595 W | 2 kW |
| Home Office Backup | 5 | 1,245 W | 1,245 W | 2 kW |
| Emergency Medical Equipment | 5 | 635 W | 1,085 W | 2 kW |
| Aquarium / Fish Tank Emergency | 5 | 495 W | 945 W | 2 kW |
| Tailgate Party | 5 | 1,405 W | 1,905 W | 3 kW |
| Summer Heat Wave | 6 | 1,595 W | 2,045 W | 3 kW |
| Small Apartment Essentials | 7 | 1,855 W | 2,355 W | 3 kW |
| Family with Young Children | 8 | 1,675 W | 2,175 W | 3 kW |
| Home Gym Backup | 5 | 1,005 W | 2,105 W | 3 kW |
| Basement Flood Prevention | 4 | 1,195 W | 2,295 W | 3 kW |
| EV Owner Emergency Charging | 5 | 1,735 W | 2,185 W | 3 kW |
| Full Remote Work Setup | 7 | 1,825 W | 1,925 W | 3 kW |
| Mini-Split AC Comfort | 6 | 1,575 W | 2,175 W | 3 kW |
| Hybrid Generator + Battery Strategy | 6 | 1,795 W | 2,295 W | 3 kW |
| Outdoor Event / Festival Booth | 6 | 1,905 W | 2,405 W | 4 kW |
| Pellet Stove Heating System | 6 | 1,695 W | 2,795 W | 4 kW |
| Light Garage Workshop | 4 | 2,420 W | 2,920 W | 4 kW |
| RV / Camping Trip | 5 | 3,425 W | 3,925 W | 5 kW |
| Elderly / Retired Couple | 8 | 2,885 W | 3,385 W | 5 kW |
| Winter Storm Preparedness | 7 | 3,595 W | 4,095 W | 6 kW |
| Hurricane Preparedness | 9 | 3,545 W | 4,645 W | 6 kW |
| Food Truck / Concession Stand | 6 | 3,650 W | 4,150 W | 6 kW |
| Post-Storm Cleanup | 5 | 3,095 W | 4,095 W | 6 kW |
| Whole House Basic Coverage | 8 | 3,895 W | 4,995 W | 7 kW |
| Full Disaster Preparedness Kit | 11 | 4,105 W | 5,205 W | 7 kW |
| Off-Grid Cabin | 7 | 4,575 W | 5,675 W | 8 kW |
| Well Water Home Essentials | 7 | 4,095 W | 6,295 W | 8 kW |
| Construction Job Site | 5 | 5,170 W | 8,170 W | 11 kW |
| Woodworking / Metal Workshop | 5 | 6,170 W | 9,170 W | 12 kW |
| Pool and Spa Maintenance | 3 | 7,600 W | 9,100 W | 12 kW |
| Whole House Full Coverage | 10 | 9,425 W | 11,625 W | 15 kW |
| Mobile Welding / Fabrication Shop | 3 | 9,020 W | 11,520 W | 15 kW |
Small (1-3 kW) Generator Scenarios
Ideal for inverter generators and portable power stations. These lightweight scenarios cover basic essentials and are suitable for camping, tailgating, and minimal home backup.
The absolute basics to keep your household running during a short-term power outage. This scenario covers food preservation, basic lighting, communica...
Keep working from home during a power outage with your desktop computer, internet connectivity, lighting, and coffee. This scenario is designed for re...
Critical medical equipment that must remain powered during outages. This scenario prioritizes life-sustaining medical devices alongside essential hous...
Protect your fish and aquatic life investment during a power outage. Aquarium equipment must run continuously to maintain water quality, temperature, ...
Power your tailgate setup with a TV for the game, gaming console for pre-game entertainment, food preparation, lighting, and device charging. This fun...
Stay cool during a summer heat wave power outage with room air conditioning, fans, food preservation, and essential electronics. Extreme heat can be m...
Essential power for a small apartment during an outage. Apartment dwellers typically have more limited power needs since they lack well pumps, sump pu...
Power the essentials for a family with young children during an outage. This includes food preparation, entertainment to keep kids occupied, lighting,...
Keep your home gym operational during a power outage with a treadmill, entertainment, lighting, and fan for ventilation. For dedicated fitness enthusi...
Focused on preventing basement flooding during storms that cause both heavy rain and power outages. The sump pump is the critical load, supplemented b...
Emergency Level 1 charging for an electric vehicle alongside household essentials during an outage. While Level 1 charging is slow, it can provide eno...
A complete remote work setup for a professional who cannot miss a day of work. This scenario includes reliable internet, computer, lighting, climate c...
Efficient cooling with a mini-split air conditioner plus household essentials. Mini-split systems are more generator-friendly than central AC because ...
Run a generator during the day to power heavy loads and recharge a portable power station that provides quiet overnight power for low-draw devices. Th...
Medium (4-7 kW) Generator Scenarios
Mid-range portable generators handle these loads well. Suitable for home offices, basic whole-house backup without central AC, and light workshop applications.
Power a booth at an outdoor event, fair, or festival with entertainment, lighting, food preparation, and device charging for you and your visitors. Th...
Power a pellet stove alongside essential household loads for an efficient winter heating strategy. Pellet stoves provide substantial heat output while...
A lighter workshop scenario with a drill press, belt sander, and lighting for smaller projects. This load profile requires a much smaller generator th...
Power your essential RV appliances and camping comforts with a portable generator. This scenario covers meal preparation, lighting, device charging, a...
Essential power for elderly residents who may be medically vulnerable during outages. This scenario includes medical equipment, climate control, food ...
Essential loads for surviving a winter storm power outage with heating, food preservation, meal preparation, communication, and lighting. This scenari...
A comprehensive hurricane preparedness generator load that includes basement flood prevention, food preservation, communication, water supply, and bas...
Power a food truck or concession stand with cooking equipment, refrigeration, and lighting. Food service operations require reliable power for both fo...
Power the tools and equipment needed for post-storm cleanup and recovery. This includes a chainsaw-alternative reciprocating saw for cutting fallen de...
Basic whole-house coverage that keeps your home functional during an outage without luxury loads. This scenario covers food preservation, water supply...
A comprehensive disaster preparedness power plan covering water, food, medical, communication, heating, and lighting. This scenario represents a well-...
Large (8-12 kW) Generator Scenarios
Large portable or small standby generators are needed for these comprehensive scenarios. Includes well pumps, sump pumps, and multiple high-draw appliances running simultaneously.
Power an off-grid cabin or remote property with essential lighting, water pumping, food storage, and basic cooking. This scenario is typical for hunti...
Essential loads for a rural home that depends on a well for all water needs. Without the well pump running, there is no water for drinking, cooking, b...
Power your essential construction tools on a job site without grid power. This scenario includes the core power tools needed for framing and general c...
Power a fully equipped workshop with major power tools and lighting. This scenario represents a serious hobbyist or professional shop running on gener...
Keep your pool and hot tub running during extended power outages to prevent costly water quality issues and potential freeze damage. Pool water can de...
Extra Large (13+ kW) Generator Scenarios
Whole-house standby generators with automatic transfer switches are recommended for these heavy-load scenarios that include central AC, welders, hot tubs, or comprehensive whole-house coverage.
Comprehensive whole-house generator sizing that covers climate control, all major kitchen appliances, laundry, entertainment, water supply, and garage...
Power a mobile welding and fabrication operation with a welder, grinder, and lighting. Welding requires a large generator due to the high power draw o...
How to Choose Between Scenarios
The right scenario depends on your primary goal and budget. If you are preparing for emergency power outages, start with the Power Outage Essentials scenario and add appliances based on your household's specific needs. Homes on well water should always include the well pump since it is the only source of running water. Homes with basements in flood-prone areas need the sump pump as a priority load. Families with medical equipment should prioritize those devices above all other comfort loads.
For budget-conscious buyers, note that the generator cost increases significantly between size tiers. A quality 3,000-watt inverter generator costs $500 to $1,000, while a 7,000-watt portable runs $800 to $2,000, and a 12,000-watt standby generator installed can cost $5,000 to $10,000 or more. The largest savings come from reducing your load below the threshold where a much larger generator is needed. For example, eliminating central AC from your generator load might save thousands in generator cost by allowing a portable unit instead of a standby installation.
Consider a phased approach: start with a portable generator sized for your essential loads, and upgrade to a standby generator later if outages prove frequent enough to justify the investment. The portable generator remains useful as a backup to the standby or for job site and recreational use. Our calculator helps you right-size each phase of your generator strategy.
Custom Scenarios
The scenarios listed above cover the most common use cases, but every household and work situation is unique. Use our interactive generator sizing calculator to build a custom appliance list and get a personalized generator size recommendation. You can select from over 80 common appliances across 10 categories, and the calculator will determine your total running watts, peak starting watts, and recommended generator size with the standard 25% safety margin.