How many solar panels do I need to power my house?  What is the correct system size for my needs?

These are common questions posed when someone is considering the purchase of a solar energy system.  The answer is unique for every home/business.  Following are key factors to consider:

  • Home/Business Energy Consumption: Use your utility bill to determine monthly and annual energy (kWh) usage for the last year.  In general, more electricity consumed equates to more panels needed. 

  • Area Available for Solar Energy System: How much space (rooftop- and/or ground mounted) is available for the installation of a system?  More available area means more panels may be installed which results in more power generated.

  • Investment Strategy: The size of the system you choose will depend on the amount of money you want to invest and the amount of electricity you want to produce.

Do the panels need to face south?

To maximize sun exposure, it is best to have the panels facing South; however, panels installed facing East or West can still generate a substantial amount of electricity.

What happens if the power goes out?

In the event that the utility grid goes out in a power outage, such as one caused by a storm, the solar electricity shuts down automatically. A few minutes after the utility grid is restored, your solar panel system, via sensors in the inverters, should turn back on automatically.

During a power outage, utility workers must often work on the lines to repair them. For safety, power to these lines must be deactivated, and that includes solar power from your system.

Will my system work on cloudy days?

Systems will produce power on a cloudy day; however, the generation will be decreased compared to a cloudless day.

How much energy does a solar panel system produce?

The amount of electricity a solar panel produces is proportional to sunlight intensity and depends on solar cell efficiency and solar panel size.

Each solar panel has a label with data specifying the amount of power (maximum power rating) produced during peak conditions. All solar panels are rated by the DC power produced in standard test conditions. A typical solar panel produces about 200 watts of electricity based on efficiency and size. For example, if you have 25 panels installed, then the output will be approximately 5 kilowatt hours (kWh).

Will the solar energy system generate electricity at night?

Solar energy systems generate power in response to sunlight so they do not produce energy at night at which time power may be obtained from your utility’s electrical grid or from an installed battery bank.

What impact does shade have on the performance of the system?

Solar panels should be installed such that they receive significant direct sunlight.  Small amounts of shade can significantly reduce the output of your system.  During our initial Site Survey Visit, we will conduct a shading analysis to ensure proper placement and orientation of your system.

Can I add to the size of my solar energy system in the future?

Yes, you may increase the size of your system in the future.  Renergy Solar will design your system for easy future expansion, if applicable.

How do I know my solar system is performing to its full potential?

Renergy Solar will consistently monitor your system.  If the data indicates suboptimal performance, then we will proactively identify and address any issues requiring our attention.

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109 Scenic Loop, Boerne, TX  78006 • (830) 755-8699 •