Gas Generator Prices

1000 Watts, 8 Amps = $1,000  Resistive loads are pretty simple:
. . . they require the same amount of power to both start and run the equipment.
. . . Many resistive loads are involved in heating or making heat of some kind.
. . . Examples of resistive loads include:

• Light bulbs
  
• Coffee maker
  
• Toaster

3000 Watts, 25 Amps = $2,600  Reactive Loads contain electric motor:
. . . which requires additional power to start,
. . . but significantly less power to run once it gets going.
. . . Typically starting power is 3 times the amount of power to run the application.
. . . Examples of reactive loads include:

• Refrigerators / freezers (fans)
  
• Furnace (fans)
  
• Well pumps
  
• Air conditioners (fans)
  
• Bench grinders
  
• Air compressors
  
• Power tools

5000 Watts, 41 Amps = $2,500 Reactive Loads, requiring additional loads.
. . . Fans require extra wattage/power to start each time, they run intermittently.  
. . . Refrigerators also have a defrost cycle in addition to the compressor and fans.
. . . Saws require extra wattage/power when they are cutting.
* Well pumps require a larger 240 volt generator (3800 watts or above)

Source: Compare-3-sizes  How much power do I need?