Which Generator?

How do I decide which Generator to buy?
Buying the right generator can seem like a formidable task. But in just a few easy steps, you can effectively decide which Generator is right for you:

  1. Identify the tools and appliances that you will power from the Generator.
  2. Determine the required power for each item
  3. Total the required amount of watts required to power the items simultaneously. (Allowing for motor starting).
  4. Choose a Generator that has rated watts that meets or exceeds this total.

APPLIANCE WATTS APPLIANCE WATTS
Light Bulb 100 Lawnmower 1000
Palm Sander 175 5" Circular Saw 1000
Slow Cooker 200 Router 1000
Radio/HiFi 200 Belt Sander 1020
Colour TV 250 Vacuum Cleaner 1100
VDU 300 Coffee Maker 1200
Strimmer 10" 350 Cement Mixer* 1320
Printer 350 Chain saw 10-16" 1500
Jig Saw 400 600W Microwave 1500
Bench Grinder 400 Portable Heater 1500
Computer 400 Hot Air Gun 1500
13mm Drill 450 Photocopier 1600
Orbital Sander 450 8" Floor Sander 2000
Hedge Trimmer 500 Compressor* 2200
Flood Lamp 500 12" Grinder 2500
4" Angle Grinder 550 Hammer Drill 2500
1/3 HP Sprayer 600 Kettle 2500
Telefax 600 Fan Heater 3000
13mm Drill 600 Hammer/Breaker 3000
Deep Freeze* 700 1HP Pressure Washer 3500
Fridge* 700 Arc Welder-130A 3500
Planer 700 Washing Machine 4000
5" Angle Grinder 750
Hairdryer 1000

*MOTOR STARTING

Motor Starting is an important consideration when buying a Generator. Keep in mind that induction-type motors, like those that run sump pumps, refridgerators and compressors typically require 2-3 times their listed running watts to start.Below is a chart you can use to determine how many watts you will need to start up motors of various sizes and types.

Note: power tools using universal commutator motors do not require additional startup power

Motor Size (HP) Running Watts Starting Watts
1/2 375 1125
1 750 2250
1.5 1125 3375
2 1500 4500
2.5 1875 5625
3 2250 6750

* See Motor Starting
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