As an online UPS manufacturer previously, POCASA has developed into an inverter supplier who mainly provides sine wave inverter since 2008.
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| Pure Sine Wave Inverter |
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How big inverter/UPS should I buy?
Short answer: the model you choose depends on the watts of what you want to run. We recommend you buy a larger model than you think you'll need totally (at least 10% to 20% more than your largest load).
Completed answer: when determining continuous power and surge (peak/starting) power, you need to consider how much power do your devices require to start up (surge power), and also the continued running requirement (continuous power).
What is meant by the terms of "continuous 2000 watts" and "peak/surge 4000 watts"? Some devices with motor require an initial surge of power to start up ("surge power" or "peak power"); once started, they require less power to continue to operate ("continuous power").
To calculate approximate surge power:
Watts X 2 = Surge power
This formula yields a close approximation of the surge power, though some may require even greater ones.
Note: induction motors such as air conditioner, refrigerator, freezer and water pump may have a start up surge of 3 to 7 times than the continuous ratings.
The below tales are general rated power of some home devices, the induction motors are marked with *.
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Appliance
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Estimated watts
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Appliance
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Estimated watts
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Coffee pot (10 cups)
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1200
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VCR
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40-60
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Coffee pot (4 cups)
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650
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CD or DVD player
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35
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Toaster
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800-1500
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Stereo
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30-100
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Cappuccino maker
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1250
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Clock radio
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50
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Coffee grinder
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100
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AM/FM car cassette
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8+
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Blender
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300
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Satellite dish
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30+
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Microwave (600 to 1000 W cooking power)
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1100-2000W (elec. consumption)
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Vacuum cleaner
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300-1100
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Waffle iron
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1200
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Christmas lights (50)
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25
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Hot plate
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1200
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Space heater
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1000-1500
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Frying pan
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1200
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Iron
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1000
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Toaster oven
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1200
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Washing machine
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920
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Blow dryer
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900-1500
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12" 3 speed table fan
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230
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Computer
- laptop - PC & monitor - printer-inkjet |
50-75 200-400 60-75 |
TV - 25" color
- 19" color TV or monitor - 12" black & white - 13" color TV/VCR combo |
300
160 30 230 |
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*Refrigerator/freezer
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600
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Game console (X-box)
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100
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*Freezer
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500-800
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*Furnace fan (1/3 hp)
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1200
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Common tools:
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Tool
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Estimated watts
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Appliance
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Estimated watts
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Jig saw
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300
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1/4" drill
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250
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Band saw
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1200
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3/8" drill
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500
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Table saw
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1800
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1/2" drill
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750
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6 1/2" circ. saw
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1000
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Shop Vac 5 hp
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1000
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7 1/4" circ. saw
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1200+
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*Sabre saw
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500
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8 1/4" circ. saw
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1800
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*Portable grinder
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1380
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Disc sander
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1200
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*Electric chain Saw 14"
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1200
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Makita chop saw
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1550
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*Airless sprayer 1/2 hp
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600
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Makita cut off saw
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1000
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*Air compressor 1 hp
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2000
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Pumps and air conditioners:
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Pump
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Running
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Starting
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Air conditioner
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*Well pump 1/3 hp
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750
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1400-3000
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*7000 BTU to 10000 BTU
Running: 1000-1500. Starting: 2200-5000. (A/C's are a very difficult load because of the high start-up surge. Use the locked rotor amps to determine the start up surge requirement). |
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*Well pump 1/2 hp
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1000
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2100-4000
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*Sump pump 1/3 hp
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800
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1300-2900
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*Sump pump 1/2 hp
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1050
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2150-4100
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Note: the wattages given above are estimated, the actual ones required may differ from those listed. Check the nameplate to determine the actual wattages required.
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