No preliminary estimate will be exact, but reasonable calculations can be made when deciding to purchase solar panels for electricity. It is difficult to come up with a precise number for specific energy needs because there are so many inconsistent factors to deal with. As the seasons change so can energy consumption.
It is also important to take into consideration the type of energy lifestyle that is being led. How many people are living in the house? Does the home have multiple televisions on at once? Are there desktop computers? Do some family members neglect to turn off lights? Is there an air conditioner? Are the lights fluorescent or incandescent? Is there a hot tub? Each house, combination of appliances, and energy lifestyle is different.
Since there are a variety of types of panels, composed of different materials, with a wide range of efficiency levels and prices, each home solar system is unique too, which also affects the cost of the utility bill. Since multiple solar panels for electricity are necessary to power a home, varying roof sizes and shapes also play a part in picking a system. While someone may be able to afford a home energy system capable of offsetting the entire electric bill, they might be restricted by the direction their roof is facing or the amount of shade cast onto it during the day.
The time frame of expected savings is another important factor to consider. Using solar panels for electricity for a home is the decision to make when considering long term savings. After the initial installation, the power generated for home use costs very little and requires almost no maintenance. Increasing energy costs are no longer an issue because even if just a portion of the utility bill is offset by the use of this technology, that piece will stay locked in at its current cost. Take the time to plan what is wanted or needed out of an independent energy system prior to making a purchase.
Although prone to slight inaccuracies, calculating how many solar panels for electricity are needed is not a difficult task. Knowing how many kilowatt hours a home uses per month and the output of a panel are details that are necessary for determining the size and cost of a home energy system. Another factor in deciding the size of the system to get is the desired electricity offset. A system that cuts utility bills in half will not be as expensive as a system that provides all the electricity to the home, but it can still create a large amount of savings. Even if it is unlikely that a rooftop installation will be able to entirely supply the energy needs for a home, it can lower utility costs and cut back on the impact of the home on the environment. The amount of kilowatt hours a home uses per month is easy to find on utility bill statements, and all of the solar panels for electricity come with a power rating. It is just a matter of determining the type of photovoltaic cell that best fits an individual's needs and budget, how much energy is necessary, and whether the roof can accommodate the number of PV cells needed.