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## Three Things to Know About Using a Power Inverter

The first thing you need to know is what you plan to do during this emergency. Smaller components or smaller amperage, smaller or smaller inverter will be needed. I will provide a table of materials and their average power consumption 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

Chain Saw Power: 1700 Watts

Electric Circular Saw: 1600 Watts

Full Size Microwave Oven: 1400 Watts

Chest freezer: 1200 Watts

Small Microwaves: 1000 Watts

1/3 inch HP Low Pump: 920 Watts

Reciprocating Saw: 720 Watts

1/2 inch Retractable Wood: 620 Watts

Coffee Maker: 600 Watts

Portable vacuum: 525 Watts

Electric Garden Equipment: 475 Watts

10 Speed Blender: 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 Computer/8 inch TV: 38-45 Watts

Cell Phone/Camcorder Charger: 10 Watts

14 Volt Cordless Drill Charger: 8 Watts

If the appliance you plan to use is listed in watts, go ahead and use that number. If they are listed in amps you just need to use this simple formula: volts (120) X amps (listed on the 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 get the watts, the formula would be: 120 (volts) X 3 (amps) = 360 watts.

You will then add up all the watts you will use and come up with a number. Let’s say your total wattage is 500 watts. If so it would be a good idea to get a 750 watt inverter. Always get a size larger than you think you’ll need, it can be useful.

Your next step will be to determine where your electricity will come from. If it’s for emergency purposes there’s a very good chance it’ll come from the battery connected to your vehicle, or you might be better off and have a bank of batteries connected the same way. Since most of the people reading this are probably not familiar with making a battery bank I will just cover using an inverter in a vehicle. The key is knowing which battery to use. It is recommended that you have a deep cycle battery or those used for riding cars or golf carts and get as many amp hours as your budget allows. A few years back I was able to go 11 days using a 750w inverter and a 120amp hour deep cycle battery attached to my car. I had to drive the car 10 minutes every 2 hours to carry everything I had which was a laptop, 13″ color tv, direct tv receiver, laptop modem, 40w light, and a small box fan. It sounds like a lot, but I thought I was living in the Ritz. Carlton compared to most of my neighbors.

The last thing you need to know is how long your battery (battery) will last before it needs to be recharged. First you need to know the voltage of all electrical appliances. Let’s say we have 480 watts of total power consumption, and we run our inverter from a 12 volt battery attached to the car. Next we need to convert this number to 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 hour battery we will divide 120 (amp hours) by 40 (amps) and get 3 hours before the battery dies. It is recommended not to charge the battery below 50% of its capacity so you may want to divide the 3 hours in half giving you 1 1/2 hours before starting the car to recharge the battery.

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