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Before purchasing any inverter, the following questions should be made clearly: DC voltage, loading size and type . Generally, DC voltage of the inverter has only one grade, users can choose corresponding inverter according to DC power supply. Loading size and type are the important factors that users should consider when select any inverter. Maximum output power of inverter is fixed, if choose loading with compressor, its starting power will exceed several times of rated power, so inverters with big output power have to be chosen as a result.
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 *.
|Appliance||Estimated watts||Appliance||Estimated watts|
|Coffee pot (10 cups)||1200||VCR||40-60|
|Coffee pot (4 cups)||650||CD or DVD player||35|
|Cappuccino maker||1250||Clock radio||50|
|Coffee grinder||100||AM/FM car cassette||8+|
(600 to 1000 W cooking power)
|Waffle iron||1200||Christmas lights (50)||25|
|Hot plate||1200||Space heater||1000-1500|
|Toaster oven||1200||Washing machine||920|
|Blow dryer||900-1500||12" 3 speed table fan||230|
|Computer||TV - 25" color||300|
|- laptop||50-75||- 19" color TV or monitor||160|
|- PC & monitor||200-400||- 12" black & white||30|
|- Printer-inkjet||60-75||- 13" color TV/VCR combo||230|
|*Refrigerator/freezer||600||Game console (X-box)||100|
|*Freezer||500-800||*Furnace fan (1/3 hp)||1200|
|Tool||Estimated watts||Appliance||Estimated watts|
|Jig saw||300||1/4" drill||250|
|Band saw||1200||3/8" drill||500|
|Table saw||1800||1/2" drill||750|
|6 1/2" circ. saw||1000||Shop Vac 5 hp||1000|
|7 1/4" circ. saw||1200+||*Sabre saw||500|
|8 1/4" circ. saw||1800||*Portable grinder||1380|
|Disc sander||1200||*Electric chain Saw 14"||1200|
|Makita chop saw||1550||*Airless sprayer 1/2 hp||600|
|Makita cut off saw||1000||*Air compressor 1 hp||2000|
Pumps and air conditioners:
|*Well pump 1/3 hp||750||1400-3000||*7000 BTU to 10000 BTU|
|*Well pump 1/2 hp||1000||2100-4000||Running: 1000-1500. Starting: 2200-5000.|
|*Sump pump 1/3 hp||800||1300-2900||(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).|
|*Sump pump 1/2 hp||1050||2150-4100|
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.