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Solar Power – How Many Solar Panels Are Needed to Power a House?

solar power

Looking forward into solar power?

Looking into solar power and wondering just how many solar panels you need?  This is one of the first questions that you would want to be answered. Thinking how much room you have and if it is enough or if you can afford them. Well, let’s look into that very question and see how many solar panels it takes to power a house.

Power your home with solar

Exactly how many solar power panels you will need is connected directly to what you want to power and the total power of these devices. If it is your house, that you want to power go back and take an average of your last year energy usage, from your energy bill. If it is some other device, perhaps outside patios, for example, check your devices manual specifications and see how much power it takes to run that particular device or devices’.

Some factors will affect your panels output and the main one is a number of sun hours per day for your particular region. This is called Insolation, which is a measure of solar radiation energy received on a given surface area in a given time; this will determine the amount of electrical power a solar panel will deliver. More sun hours bigger the output of solar power will be, less sunlight per day less power output makes sense. There are charts of the amount of sunshine a certain area will receive per day. A quick look at other things that will reduce your electrical output:

Factors that Reduces Electrical Output

  • Shade
  • Dirt
  • Snow
  • Pollen
  • Bird droppings
  • Typical solar panels has a 12-20 % efficiency

All these things will diminish your solar power output; anything that will cover your panels will have the same result. At certain times of low light or if other situations cause low output you may need to have a generator on hand to charge your battery’s for these situations.

With all that out of the way, how many panels do I need to power a house: take the total daily watt hours and divide them by the hours of sunshine/day? In general, a rough number of panels that can run everyday appliances would be six (6) 80-100 watt panels at 1m2 in size. Remember the amount of sunshine will change pending the time of year and the region you live in. Another factor to take into account is the adding to the household electrical load in time with other electrical appliances, can opener’s toasters’, etc.


How many solar panels does it take all depends on the factors that have been discussed and some that are yet to be discussed. Each location will have its different problems that will arise. Talk to your solar installer, and he can set your mind at ease with some panels that will be needed, how to overcome some of the factors affecting your output and how to get the most out of your panel array. Technology is ever advancing the solar panel industry, In the near future, it certain the output will also change for the new solar panels, and the number of panels needed will also change.


Read also how much would it cost to switch to renewable energy

Approximately 65% of all solar panels in the world are produced in China.

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