Most of the data suggests that a typical American household (2,000 square foot house) consumes approximately 11,000 kilowatt-hours per year. Therefore, when we divide our total consumption by the expected production of a solar panel, we see that approximately thirteen solar panels of this size would be enough to power a house of that size. The number of solar panels depends on the amount of energy you use, the average daily sunlight and its size. A small house or cabin that uses 1,500 kWh and receives an average of 4 hours of total sunlight per day, would need two 300 W panels.
A large house, in the same area, requiring 9000 kWh, would require ten 300 W panels. Annually, each panel will generate about 900 kWh per year. On average, a home consumes 11,000 kWh of energy per year, which means you'll need around 13 panels to power your home 100% with off-grid solar energy. Solar installers will also be able to give you an idea of the initial costs of solar energy for your home and what rebates, incentives and tax credits homeowners in your area qualify for.
A single panel will not be able to generate the financial benefits of using solar energy; you need to power your home sufficiently. Since you now know how much 1 kW of solar energy will produce in your area, you can determine the size of the solar system you need to meet your electricity needs. You can calculate how many solar panels you can buy for your system in the UK by taking into account the house's energy use, the energy produced by the system, the size of your roof, and the hours of sunshine in your region. Your typical solar panels come with a warranty that lasts 25 years, so you are guaranteed to reap the benefits for quite some time.
While installing solar panels can often reduce or even fully offset your monthly electricity bill, remember that electricity rates and usage are volatile factors. The following tips will help you calculate how many solar panels you need and what factors will affect that number. Then, you need to calculate how much each panel will produce under average conditions based on its area and install the number of panels that could produce the electricity you need. A medium-sized home using 6.5 kWh, with a 24-volt battery system and a five-day backup, needs 13 300-watt solar panels.
Roof stability is also an important factor, since solar panels can be heavy, especially if you intend to have several units. Five 300W solar panels are enough to power your grid-connected home, though it may vary depending on power requirements. The power of a panel is its rated power; the amount of energy that a panel generates under perfect conditions. According to a study conducted by the National Renewable Energy Laboratory, solar panels last 80% longer than their warranty.
If you're considering installing solar panels in your home and aren't sure where to start, you've come to the right place.