How big of a solar panel do i need | Solar panel wholesaler

How big of a solar panel do i need

The average U.S. home needs 20 to 30 solar panels to offset 100 percent of its electricity expenditure. However, outcomes vary based on factors including household energy usage and geographic location.

To begin to size a solar system, use these steps to estimate your home’s average electricity consumption and PV needs:

1- Calculate your kWh usage

Gather the kilowatt-hours (kWh) usage from your electric bill. You’ll want to have full 12 months of consumption to be able to look at peaks and dips in usage across a year. Energy consumption climbs in the summer and winter with excessive use of your A/C and heating units.

Determine your typical monthly kWh usage. Add up your kWh usage for 12 months and divide by 12 to figure out your average monthly consumption. Your grid-tied system will likely overproduce in the summer with peak solar exposure.

Figure your daily kWh usage. Divide by 30 to calculate your daily kWh usage.

To assess your house’s energy usage more accurately, utilize our home appliances power consumption table to find out how many kWh your appliances would require per month.

If your utility provides a favorable net metering policy, the energy your system creates can be banked with the utility as a credit that can be used later. Not all utility companies give you credit; check with your local provider.

2- Look up your peak sun hours

Average peak solar hours vary substantially based on your location and local climate. You’ll want to establish how many peak hours of sunlight you’ll get so you can make the most of the solar power:

Look up your peak sun hours, utilizing a sun hours chart to establish the number of hours per day the sun provides peak sunlight. Find the nearest city to you and write down the daily average of peak solar hours.

3- Calculate the size of your solar system

To figure out how to size your solar system, take your daily kWh energy requirement and divide it by your peak sun hours to get the kW output. Then divide the kW output by your panel’s efficiency to get the anticipated number of solar panels you’ll need for your system.

(Daily kWh ÷ average sun hours) x 1.15 efficiency factor = DC solar system size

For example, if you live in New Mexico, you average six peak sunlight hours per day. You’ll require 6.2 kW DC according to the formula:

  • (33 kWh ÷ 6.1 sun hours) x 1.15 efficiency factor = 6.2 kW DC solar system size required
  • Using the example above with a 6.2 kW DC system, you can multiply this amount by 1,000 to establish that you require 6,200 watts of solar panels.
  • 6.2 kW x 1000 (convert to watts) = 6200 watts solar panel required

Final Words

Your solar PV system is hopefully going to be on your roof for many years to come, so you want to try to anticipate how much electricity you’ll likely need in the future too.  Some future needs include working from home more often and using more electricity at home.

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