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Three Things to Know About Using a Power Inverter
The first thing you will need to know is what you plan to run in this time of emergency. The fewer items or the smaller the amperage, the smaller or least expensive inverter will be needed. I will provide a table of items and their average power usage below followed by a simple formula that will give you an idea of the size of inverter you will need.
Stackable Washer/Dryer: 2500 Watts
Electric Chainsaw: 1700 Watts
Electric Circular Saw: 1600 Watts
Full Size Microwave Oven: 1400 Watts
Chest freezer: 1200 watts
Mini microwave: 1000 watts
1/3 inch HP Submersible Pump: 920 Watts
Reciprocating Saw: 720 Watts
1/2 inch Reversible Drill: 620 Watts
Coffee machine: 600 watts
Portable Vacuum: 525 Watts
Electric Garden Tools: 475 Watts
10 Speed Mixer: 450 Watts
Orbital Sander: 400 Watts
Home Stereo: 350 Watts
3/8 inch Variable Speed Drill: 320 Watts
20 inch TV/VCR Combo: 300 Watts
12 inch Three Speed Fan: 200 Watts
Computer/Printer/Fax: 150 Watts
Quartz Halogen Spotlight: 100 Watts
Mini Stereo/CD Player: 50 Watts
Laptop/8-inch TV: 38-45 Watts
Cell phone/camera charger: 10 watts
14 Volt Cordless Drill Charger: 8 Watts
If the device you plan to use is listed in watts, just go ahead and use that number. If it’s listed in amps, you just need to use this simple formula: volts (120) X amps (listed on device) = watts. This will give you the amount of watts the device will use. So if you had a 3 amp device, and you wanted to find the watts, the formula would be: 120 (volts) X 3 (amps) = 360 watts.
You would then add up all the watts you will use and come up with a number. Let’s say your total wattage usage is 500 watts. If that were the case, it would be a good idea to get a 750 watt inverter. Always get a bigger size than what you think you will need, it can come in handy.
Your next step will be to determine where your power supply will come from. If it is for emergency purposes, there is a very good chance it will come from a battery connected to your vehicle, or you may be a little better prepared and have a bank of batteries connected in parallel. Since most people reading this probably don’t know how to set up a battery bank, I’ll just cover running the vehicle’s inverter. The main thing to know is what kind of battery you will be using. It is suggested that you have a deep cycle battery or those used for trolling motors or golf carts and that you get as many love periods as your budget allows. A few years back I was able to last 11 days using a 750w inverter and a 120amp deep cycle battery attached to my car. I had to drive the car for 10 minutes every 2 hours to power everything I connected, which was a laptop, a 13″ color TV, a direct TV receiver, a modem for the laptop, a 40w light, and a small box fan. Doesn’t sound like much , but I thought I was living at the Ritz Carlton compared to most of my neighbors.
The last thing you need to know is how long your power supply (battery) will last before it needs recharging. First you will need to know the power of all devices. Let’s say we use 480 total watts of power, and we run our inverter from a 12 volt battery connected to the car. Next we need to convert this number so we know how many amps are being used. We do this by taking the watts (480) and dividing it by 12 (battery volts) and comes up with 40 amps. The formula is: watts / volts = amps. If we have a 120 amp hour battery, we would divide 120 (amp hours) by 40 (amps) and get 3 hours before the battery dies. It is recommended not to drain a battery below 50% of its capacity, so you may want to split the 3 hours in half, giving yourself 1 1/2 hours before starting the car to recharge the battery.
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