Using an Inverter for Emergency Home Backup Power

Using an inverter for emergency backup power is by far the most common use. The Hurricane season is here for those of you in the east and down south. I hope that this blog will help all of you to be more prepared in the likely event that power failure occurs. Here are some helpful tips about running an inverter during a power outage.

Before you purchase an inverter you will want to take a piece of paper and a pen and write down all of the appliances that you feel are necessary to have during a power outage. After you write down all that, you need to go to each one of the appliances and look on the back or bottom for what is called the service tag. This tag will show you a few important specs that help with picking the correct size of the inverter. The first spec that you will most likely come across is the voltage; this will either be 110,115, 120, 220, 230, or 240vac.

Home Backup Power Inverter

In some cases you may find that the voltage is between 205vac and 240vac. You will need a special inverter to run this appliance.

The next spec you will find will be the Amps. For example this should read like this: 6.0A or 6.0 Amps. What you will do now is take the volts–lets say 115–and multiply by amps 6.0 and this will give you 690 watts. The equation should look like this Volts x Amps = Watts or in this example 115 x 6.0 = 690. Ok, Now that we got that out of the way we can start sizing an inverter that is going to work well during a power outage.

The most common inverter sold for emergency home back-up power is a 1750 watt. The reason for this is that most people want to hook it up to their car, and the 1750 is perfect for most vehicles and will run most appliances. When you hook the inverter up to your vehicle, to run the inverter you will want to try to keep the inverter close to the battery, and out of any weather. I get a lot of calls about why inverters sometimes won’t work when they are hooked to the vehicle this way. Most people hook these up with jumper cables. This is not the best way to do this. Jumper cables do not give a proper connection to the inverter. The best way to hook an inverter up is with a ring terminal that fits properly over the inverter post.

Next we have to cover how the battery will hold a charge. You will want to keep the vehicle running while the inverter is hooked up. This will allow the vehicle’s charging system to keep a charge on the battery while the inverter is in use. If the car is off, the inverter will still work. However, for prolonged use the inverter will work best if the vehicle is running. This just about covers using an inverter for emergencies with a vehicle.

When using an inverter for emergency backup power in a home without a vehicle there are a number of ways to accomplish this. First you can have, say, two 12 volt batteries hooked in parallel, and one inverter. This will give you enough power to run say a refrigerator off and on for two days or so depending on the size of the batteries. If you decide to do this you may want to have at least one back-up battery for the system in case power failure exceeds your battery time.

The next option is for complete home backup. This is the best option, but one of the most expensive. The system will require a large bank of batteries at a higher voltage, say 24 volt or 48 volt. They do make 12 volt systems, but they are less efficient. The best batteries to use in a large bank like this are the 6 volt batteries either made for solar or golf carts. They have a much higher reserve time and are cost effective. The next component is an inverter/charger. These are great for home backup power. They have three key components: an inverter, a charger, and a transfer switch. Inverter-chargers come in sizes ranging from 1500 watts to 5500 watts. The battery chargers that are included range from 70 amps to 150 amps and will charge the input DC voltage of the inverter (12V, 24V, or 48V). This system is a lot more complex than that of a inverter and battery. Most of the inverter/chargers do not have built in AC outlets and require an electrician or professional solar installer to hook them up.

The way that the inverter/charger will work is that the inverter will work when the power is off and the battery charger will charge and maintain the batteries while the power is on. Since the battery charger that is included is a three stage battery charger with smart charging capabilities it is safe to leave the batteries hooked up to this at all times. The internal transfer switch will allow for automatic switching. This means that you will not have to do anything when the power goes out. The inverter/charger will start running all of the appliances you have selected all by itself. Even though the inverter/chargers are more expensive they are much more convenient and you won’t even know that the power went out.

Now that we covered the home backup power without a vehicle, let’s talk about 240vac appliances. Even though there are inverters that will work for this you may want to consider not running them during a power outage because of the large draw from the batteries that they have. If you must run a 240 vac appliance you will want to have a complete separate system from the 110vac inverter system that is running the common household appliances such as the refrigerator or lights.

I hope that this information will help those of you who are faced with hurricanes and other sources of power outages. You can find a great selection of power inverters at www.Prostarsolar.net or www.Prostar-china.com. Any questions or comments would be appreciated.

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