select_an_inverter
HOW TO SELECT
YOUR FIRST POWER INVERTER
How to Select An Inverter ✔
Choosing the right size of inverter depends on the power requirements of the appliances you expect to operate at any given time. You should consider both the continuous and surge power rating of your appliance. The continuous rating must be high enough to handle all the loads that may run at the same time. The inverter must also be capable of handling the starting surge of all loads that may start at the same time. Loads typically take many times their continuous rating to start.
Short Answer: The size you choose depends on the watts (or amps) of what you want to run (find the power consumption by referring to the specification plate on the appliance or tool). We recommend you buy a larger model than you think you'll need (at least 20% to 30% more than your largest load).
Example: You want to power a computer with a 17" monitor, some lights, and a radio.
Computer 300Watts
2x60 Watt Lights 120Watts
Radio 10Watts
Total Needed 430Watts
For this application, you would minimally need a 500 W inverter, and should give some thought to a larger one, as there will likely be a time when you wish you'd bought a bigger model ... in this example, you might decide you'd like to run a fan while you compute, or let the kids watch TV.
Longer Answer: Determine Continuous Load and Starting (Peak) Load: You need to determine how much power your tool or appliance (or combination of them that you would use at the same time) requires to start up (starting load), and also the continued running requirements (continuous load).
What is meant by the terms "continuous-2000 watts" and "peak surge-4000 watts" is that some appliances or tools, such as ones with a motor, require an initial surge of power to start up ("starting load" or "peak load"). Once started, the tool or appliance requires less power to continue to operate ("continuous load")
Note: The wattage's given below are estimates. The actual wattage required for your appliances may differ from those listed. Check the nameplate on the appliance to determine the actual wattage required.
Pumps and Air Conditioners |
Estimated Watts |
* Well Pump 1/3 hp |
750 (Running) |
* Well Pump 1/2 hp |
1000 (Running) |
* Sump Pump 1/3 hp |
800 (Running) |
* Sump Pump 1/2 hp |
1050 (Running) |
* Air Conditioner |
1000-1500 (Running) |
Common Tools |
Estimated Watts |
Angle Grinder |
900 |
Drill (1/4"-1/2") |
500-960 |
Disc Sander |
1200 |
Jig Saw |
300-700 |
Band Saw |
700-1200 |
Table Saw |
1800 |
Cicular Saw |
1400-1800 |
Chop / Cut Off Saw |
1500-1800 |
Shop Vac 6.5 hp |
1440 |
* Electric Chain Saw 14" |
1200 |
* Airless Sprayer 1/2 hp |
750 |
* Air Compressor 1 hp |
2000 |
Common Appliances |
Estimated Watts |
Coffee Maker |
600-1200 |
Keurig |
1500 (max) |
Blender |
300-1000 |
Microwave |
1000-2000 |
Waffle Iron |
800-1500 |
Hot Plate |
750-1500 |
Electric Skillet |
1000-1500 |
Toaster Oven |
1200 |
Toaster |
800-1500 |
Hair Dryer |
1000-1875 |
Vacuum Cleaner |
300-1500 |
Space Heater |
750 / 1500 |
Clothes Iron |
1000-1500 |
* Refrigerator |
500-750 |
* Chest Freezer |
600 |
* Washing Machine |
500-1000 |
Furnace Fan |
750-1200 |
Household Fan |
50-120 |
Clock Radio |
10-50 |
Stereo |
30-100 |
Cell Phone Charger |
10 |
Laptop Computer |
20-75 |
MacBook Pro |
85 |
iPad / Tablet |
10-20 |
Desktop with Monitor |
200-400 |
Inkjet Printer |
15-75 |
Laser Printer |
500 (continuous) |
Photographic Strobe |
1200 (peak) |
Aquarium |
50-1000 |
TV 32" LED/LCD |
50 |
TV 42" Plasma |
240 |
Home Theater Projector |
200 |
Blu-Ray or DVD Player |
15 |
Satellite Dish / Receiver |
20-30 |
Video Game Console |
40-140 |
* Appliances and tools with induction motors (marked * in tables) may require from 3 to 7 times the listed wattage when starting. The start-up load of the appliance or tool determines whether an inverter has the capability to power it. Be sure to check the specific wattage requirements and operating instructions for appliances / tools to be used. Also, air conditioners are a very difficult load because of the high start-up surge. Use the Locked Rotor Amps to determine the start up surge requirement.
Rated vs. Actual Current Draw of Equipment✔
Most electrical tools, appliances and audio/ video equipment have labels that indicate the power consumption in amps or watts. Be sure that the power consumption of the item you wish to operate is less than inverter’s power. (If the power consumption is rated in amps AC, simply multiply by the AC volts (120) to determine the approximate wattage). The inverter will shut down if it is overloaded. The overload must be removed before the inverter will restart. Resistive loads are the easiest for the inverter to run. However, larger resistive loads, such as electric stoves or heaters, usually require more wattage than an average sized inverter can deliver. Inductive loads, such as TV’s and stereos, require more current to operate than do resistive loads of the same wattage rating. Induction motors, as well as some televisions, may require 2 to 6 times their wattage rating to start up. The most demanding in this category are those that start under load, such as compressors and pumps. To restart the unit after a shutdown due to overloading, remove the overload if necessary turn the power switch OFF then ON.