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Your off-grid inverter choice will depend on the appliances in use

Equipment Power consumption Continuous power rating of inverter
150W 300W 600W 1000W 1500W 2000W 3000W 4000W
---  Audio and video appliances ---                  
 12'' colour LCD TV  20W Ok Ok Ok Ok Ok Ok Ok Ok
 Satellite TV receiver 30W Ok Ok Ok Ok Ok Ok Ok Ok
 HiFi stereo with CD changer 50W Ok Ok Ok Ok Ok Ok Ok Ok
 20'' colour LCD TV 100W Ok Ok Ok Ok Ok Ok Ok Ok
 42'' colour LCD TV 200W - Ok Ok Ok Ok Ok Ok Ok
 Stereo amplifier 250W - Ok Ok Ok Ok Ok Ok Ok
 Home theatre system 500W - - Ok Ok Ok Ok Ok Ok
    Continuous power rating of inverter
--- Home and kitchen appliances ---    150W 300W 600W 1000W 1500W 2000W 3000W 4000W
 Table fan 50W Ok Ok Ok Ok Ok  Ok Ok Ok
 Sewing machine* 100W - Ok Ok Ok Ok Ok Ok Ok
 Halogen light* 100W - Ok Ok Ok Ok Ok Ok Ok
 Pedestal fan* 100W - Ok Ok Ok Ok Ok Ok Ok
 Blender* 350W -  - - Ok Ok Ok Ok Ok
 Small fridge* 200W - - Ok Ok Ok Ok Ok Ok
 Large fridge* 500W - - - - Ok Ok Ok Ok
 Washing machine* (no heating) 700W - - - - - Ok Ok Ok
 Microwave oven 900W - - - Ok Ok Ok Ok Ok
 Coffee maker* 1200W - - -  - - Ok Ok Ok
 Iron 1200W - - -  - Ok Ok Ok Ok
 Hair dryer* 1200W - - -  - - Ok Ok Ok
 Toaster 1200W - - - - Ok Ok Ok Ok
 Vacuum cleaner* 1500W - - - - - Ok Ok Ok
 Dishwasher (hot dry) 1500W - - - - - Ok Ok Ok
 Hob 1500W - - - - - Ok Ok Ok
 Washing machine* (with heating) 2000W - - - - - - Ok Ok
 Air conditioner* 3000W - - - - - - Ok Ok
 Electric oven 5000W - - - - - - - -
    Continuous power rating of inverter
  --- Computers and home office ---   150W 300W 600W 1000W 1500W 2000W 3000W  4000W
 Mobile phone charger 5W Ok Ok Ok Ok Ok Ok Ok Ok
 Inkjet printer 40W Ok Ok Ok Ok Ok Ok Ok Ok
 Laptop 50W Ok Ok Ok Ok Ok Ok Ok Ok
 Fax machine 50W Ok Ok Ok Ok Ok Ok Ok Ok
 Desk lamp 50W Ok Ok Ok Ok Ok Ok Ok Ok
 Desktop computer with 17'' monitor 400W - - Ok Ok Ok Ok Ok Ok
 Large laser printer* 800W - - - - Ok Ok Ok Ok
    Continuous power rating of inverter        
--- Power tools and other equipment ---   150W 300W 600W 1000W 1500W 2000W 3000W 4000W
 Drill* 800W - - - -  - Ok Ok Ok
 Electric chainsaw* 1000W - - - -  - Ok Ok Ok
 Electric lawn mover* 1000W - - - - - - Ok Ok
 Pressure washer* 1000W - - - - - - Ok Ok
 Grinder* 2000W - - - - - Ok Ok Ok
 Air compressor* 2000W - - - - - - Ok Ok

*Starting power consumption several times greater than their normal working power will effect optimum inverter choice