How to choose a generator


What are your power requirements? Here is all you need to consider so you can choose the generator that suits you before making your purchase.
PLEASE NOTE THAT THIS CHART IS A GUIDE LINE AND ACTUAL CONSUMPTION MAY VARY TO WHAT IS INDICATED BELOW
CONSUMPTION CHART
PRODUCT CATEGORY PRODUCT DESCRIPTION RUNNING/RATED
POWER IN WATTS
ADDITIONAL STARTING
POWER IN WATTS
TOTAL POWER REQUIRED
FROM GENERATOR TO
START AND RUN
PRODUCT IN WATTS
ESSENTIALS LIGHT BULBS INCANDECENT 40WATT
LIGHT BULBS INCANDECENT 60WATT
LIGHT BULBS INCANDECENT 100WATT
40
60
100
0
0
0
40
60
100
KITCHEN REFRIGERATOR/FREEZER
DISHWASHER
MICROWAVE OVEN - 625 WATT
MICROWAVE OVEN - 1000 WATT
COFFEE MAKER - 1000 WATT
KETTLE - 2200 WATT
TOASTER - 850 WATT
FOOD PROCESSOR
ELECTRIC GRILLER - 2200 WATT
1000
1500
625
1000
1000
2200
850
400 - 600
2200
2000
3000
0
0
0
0
0
0
0
3000
4500
625
1000
1000
2200
850
400 - 600
2200
LAUNDRY WASHING MACHINE
TUMBLE DRYER
IRON - 1200 WATT - 1600 WATT
1200
1500
1200 - 1600
2400
3000
0
3600
4500
1200 - 1600
FAMILY ROOM LED TV 47"
DVD PLAYER
DSTV
 300 - 500
150
150
0
0
0
300 - 500
150
150
HEATING/COOLING AIRCONDITIONER - 9000 BTU
AIRCONDITIONER - 12000 BTU
AIRCONDITIONER - 18000 BTU
AIRCONDITIONER - 24000 BTU
FAN 20"
1500
1800
2500
3800
200
3000
3600
5000
7600
0
4500
5400
7500
11400
200
WORK DIY
ELECTRICAL MOTORS THAT USE BRUSHES WILL HAVE A COEFFICIENT OF APPROXIMATELY 1.4. THIS MEANS THAT THE START UP POWER MUST BE MULTIPLIED BY THE COEFFICIENT FOR EXAMPLE A 500 WATT POWER DRILL WILL REQUIRE AND ADDITIONAL 700 WATTS STAART UP POWER THEREFORE THE TOTAL REQUIRED POWER TO OPERATE THE DRILL IS 500w + 700w = 1200w
  ROTARY DRILL - 550W
IMPACT DRILL - 850W
MULTI SANDER - 160W
ORBITAL SANDER - 200W
BELT SANDER - 710W
ANGLE GRINDER -850W
ANGLE GRINER - 2200W
MITRE SAW - 2000W
PLANER - 500W
JIGSAW - 620W
550
850
160
200
710
850
2200
2000
500
620
770
1190
224
280
994
1190
3080
2800
700
868
1320
2040
384
480
1704
2040
5280
4800
1200
1488
ASYNCHRONOUS MOTORS (SQUIRREL CAGE TYPE) WILL HAVE A COEFFICIENT OF APPROXIMATELY 2. THIS MEANS THAT THE START UP POWER MUST BE MULTIPLIED BY THE COEFFICIENT FOR EXAMPLE A 2200 WATT AIR COMPRESSOR WILL REQUIRE AND ADDITIONAL 4400 WATTS START UP POWER THEREFORE THE TOTAL REQUIRED POWER TO OPERATE THE AIR COMPRESSOR IS 2200w + 4400w = 6600w
WORK DIY AIR COMPRESSOR 200LT - 2200W
AIR COMPRESSOR 24LT - 1100W
2200
1100
4400
2200
6600
3300
WORK OFFICE COMPUTER MONITOR
COPY MACHINE
LAZER PRINTER
 300-500
1500 - 2000
800 -1200
0
0
0
300 -500
1500 - 2000
800 - 1200

http://gentechindustries.co.za/Gentech-Power/brand


LOAD CALCULATOR
SINGLE PHASE SYSTEMS - 230V
POWER (WATT) = V (VOLTS) X I (AMPERE) X COS (POWER FACTOR OF 1)
THEREFORE
POWER (WATT) = V (VOLTS) X I (AMPERE) X COS (POWER FACTOR OF 1) = VA
3 PHASE SYSTEM - 400V
POWER (WATT) = 3 X V(VOLTS) X I (AMPERE) X COS (POWER FACTOR OF 0.8)
THEREFORE
POWER (WATT) = V (VOLTS) X I (AMPERE) X COS (POWER FACTOR OF 0.8) = VA

OTHER IMPORTANT CALCULATIONS:
AMPERE (I) = POWER (WATTS) / VOLTS

SERVICE, MAINTENANCE AND RUNNING TIPS
  • Before starting your generator, always ensure that there is sufficient oil and fuel in the machine. Only use SAE30 graded oil and unleaded petrol (for petrol models) and low sulphur diesel (for diesel models).
  • Always place your generator on a flat surface when pouring in the oil and fuel.
  • If you have an electric start generator, check that your battery is fully charged before starting.
  • Ensure that the choke is on when starting your generator, once started, switch the choke to the ‘off’ position.
  • Never connect your appliances before starting your generator, always start your generator first, and then connect one appliance at a time.
  • Disconnect your appliances before switching off your generator.
  • Switch off the fuel tap prior to turning off your generator, to allow the fuel in the carburettor to be used.
  • We recommend that your first service should be after 20 running hours and thereafter at 50 hour intervals.
  • Always operate your generator in a well ventilated area, as toxic fumes are emitted from your generator.
  • Do not use dirty fuel or oil in your generator.