Portable Generator Size Calculator
Calculate the right portable generator size by entering your appliances and power requirements below.
List of the Top 10 Best Portable Generator:
Understanding Portable Generator Sizing
When selecting a portable generator, proper sizing is crucial for reliable power delivery. This comprehensive guide will help you understand the key factors in choosing the right portable generator for your needs.
Portable Generator Types and Uses
| Type | Size Range | Best For | Typical Applications |
|---|---|---|---|
| Small Inverter | 1,000-2,200W | Recreational use, camping, tailgating | Electronics, small appliances, lights |
| Medium Inverter | 2,300-4,000W | RV power, small tools, backup power | RV A/C, power tools, essential appliances |
| Large Portable | 4,000-8,000W | Job sites, home backup | Multiple tools, critical home systems |
| Extra Large Portable | 8,000-15,000W | Whole house partial backup | Most home appliances, heavy equipment |
Common Portable Appliance Power Requirements
| Appliance | Running Watts | Starting Watts | Notes |
|---|---|---|---|
| Space Heater | 1,500W | 1,500W | No surge requirement |
| Window AC (8,000 BTU) | 800W | 1,600W | High starting surge |
| Portable Fan | 100W | 200W | Minimal power needs |
| Mini Refrigerator | 400W | 800W | Consider duty cycle |
| Microwave Oven | 1,000W | 1,000W | Check actual wattage on unit |
| Coffee Maker | 1,000W | 1,000W | No surge requirement |
| Power Tool (Average) | 800W | 1,200W | Varies by tool type |
| Job Site Light | 500W | 500W | LED versions use less power |
Key Features to Consider in Portable Generators
1. Power Output Types
- Standard Power: Basic power output suitable for most appliances and tools
- Clean Power (Inverter): Safe for sensitive electronics, more fuel efficient
- Dual-Mode: Can switch between high power and efficient operation
2. Portability Features
- Weight: Consider if you'll need to move it frequently
- Wheels: Essential for larger units
- Handle Design: Telescoping or fold-down for easy transport
- Lifting Points: Important for job site mobility
3. Noise Levels
- Quiet (50-60 dB): Inverter generators, good for camping
- Moderate (60-70 dB): Standard portable units
- Loud (70+ dB): Larger construction models
Portable Generator Safety Guidelines
Operation Safety
- Placement:
- At least 20 feet from buildings
- Away from windows and doors
- On level, dry ground
- Protected from weather
- Ventilation:
- Never operate indoors
- Avoid enclosed spaces
- Consider wind direction
- Fuel Safety:
- Store fuel properly
- Never refuel when hot
- Use fresh fuel only
Maintenance Tips for Portable Generators
Regular Maintenance Schedule
- Before Each Use:
- Check oil level
- Inspect air filter
- Check fuel level
- Test start system
- Monthly:
- Run generator (30 minutes)
- Check battery condition
- Inspect fuel lines
- Every 6 Months:
- Change oil
- Clean air filter
- Check spark plug
Portable Generator Connection Options
Common Outlet Types
- 120V Household: Standard appliances and tools
- 120/240V: Higher power equipment
- USB Ports: Electronics charging
- RV Ready: Direct RV connection
Frequently Asked Questions
How long will a portable generator run on a tank of fuel?
Run time varies based on:
- Load percentage (25-100% capacity)
- Tank size (typically 1-10 gallons)
- Generator efficiency
- Typical range: 8-20 hours at 50% load
Can I power my RV air conditioner with a portable generator?
Key considerations:
- Most RV A/C units need 2,800-3,500 starting watts
- Look for generators rated 3,500W or higher
- Choose models with RV-ready outlets
- Consider inverter generators for clean power
What's the difference between running watts and starting watts?
Important distinctions:
- Running watts: Continuous power needed
- Starting watts: Extra power for startup
- Motor-driven appliances need 2-3x running watts
- Size generator for highest starting requirement
How do I store my portable generator?
Storage guidelines:
- Short-term Storage:
- Add fuel stabilizer
- Run generator dry
- Cool completely
- Long-term Storage:
- Drain fuel system
- Change oil
- Remove battery
- Cover and store in dry location
What's the best fuel type for a portable generator?
Common fuel options:
- Gasoline:
- Most common
- Readily available
- Shorter shelf life
- Propane:
- Longer shelf life
- Cleaner burning
- Less efficient power
- Dual Fuel:
- Maximum flexibility
- Backup fuel option
- Higher initial cost