Photo: Liza Summer

How many solar panels and batteries are needed to run a house off-grid?

You'll be generating 1.8 kWh per panel per day. To meet the average requirement of 29.33 kWh of electricity per day for your household, then, you'll need 17 solar panels.

southfacesolar.com - How Many Solar Panels Do You Need to Run a House Off the Grid?

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How Many Solar Panels Do You Need to Run a House Off the Grid?

Going off-grid with solar in Arizona is more complicated than installing a grid-tied home solar energy system. You’ll need more solar panels than a grid-tied system as well as plenty of backup power. While we can’t pinpoint exactly how many solar panels and batteries you’ll need to go off grid without discussing your specific energy needs and location, we can give you a better idea of what it takes to run an Arizona off-grid solar home. According to the EIA, American utility users consume an average of 893 kWh of electricity per month. That’s about 29.33 kWh per day. Most residential solar panels can produce between 250 and 400 watts per hour, depending on their size. For simplicity’s sake, let’s say you decide to install 300-watt solar panels and your solar panels receive 6 hours of sunlight per day. You’ll be generating 1.8 kWh per panel per day. To meet the average requirement of 29.33 kWh of electricity per day for your household, then, you’ll need 17 solar panels. Of course, this is just one example. To find out how many solar panels it would take to power your off-grid system, schedule a consultation with SouthFace Solar & Electric.

Backup Batteries & Generators for Off-Grid Solar

Because they are not connected to the electric grid, off-grid solar systems must meet the home’s electricity needs completely. This means they need to have backup power for use at night, on overcast days, and to maintain power if the solar panels malfunction or become damaged. It’s best to have multiple sources of backup power for your off-grid home. A combination of solar batteries and generators will give you plenty of reliable backup power and the peace of mind that comes with it. How much backup power you need for off-grid solar depends heavily on the amount of power you use and the amount of electricity your solar panels generate. SouthFace Solar & Electric can help you make the right solar battery and generator choice for your home.

Is Off-Grid Solar Right for Your Home?

Off-grid solar panels and solar batteries in the Phoenix, Arizona area provide a number of benefits. Off-grid solar is a great option if:

You want to completely eliminate your electric bills

You want full energy independence with zero reliance on the utility

You want to drastically reduce your carbon footprint and live a more sustainable life

You live in a remote area that does not have grid access

If you’re thinking about installing an off-grid solar system in Arizona, our number one piece of advice is to consult with an experienced off-grid solar company. At SouthFace Solar & Electric, we install custom off-grid solar systems in Phoenix and throughout all of Arizona. We can help you understand how off-grid solar works and design the right system for your needs. We’ll walk you through how much an off-grid solar system costs and help you weigh the benefits vs. cost to help you make the best decision for your home. Our team is passionate about solar energy and believes in its power to transform our customers’ lives. Reach out with any questions you have about off-grid solar and we’ll be happy to help.

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Do mobile phones work in a power cut?

Those wires are almost always buried, so ice storms and hurricanes will not cut them. The phone company supplies the power that your phone needs using your dedicated copper pair. So even if the power goes out in your house, the phone still gets the power it needs through the phone line.

electronics.howstuffworks.com - Why Does the Phone Still Work When the Electricity Goes Out?

One of the relative miracles of modern times is the reliability of the phone system. The power goes out fairly often for most people. Sometimes it is only out for a second, but other times it can be out for minutes, hours or even days. Your telephone, on the other hand, is always working (as long as you pay the bill). Why is that?

The article How Telephones Work talks about the simplicity of phones and the telephone network. The article shows you how, with just a 9-volt battery and a resistor, you can create your own intercom system using two normal telephones. A phone will work as long as it is getting between 6 and 12 volts at about 30 milliamps. In other words, it takes very little power to operate a telephone. Between your house and the phone company's office there is a dedicated pair of copper wires for your phone. Those wires are almost always buried, so ice storms and hurricanes will not cut them. The phone company supplies the power that your phone needs using your dedicated copper pair. So even if the power goes out in your house, the phone still gets the power it needs through the phone line. And at the phone company office there is an extensive battery system, as well as a backup generator, to supply power during a power failure. If the power goes out, the batteries and generators keep the office fully powered. Therefore, all of the phones connected to the office are fully powered as well.

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