Compare price and performance of the Top Brands to find the best 11 kW solar system with a SolarEdge inverter and module optimizers. Key benefits of a SolarEdge system include better output (2% more in direct Sun; up to 25% more in shade), monitoring of each panel, and ability to mix panels, For hom Contact online >>
Compare price and performance of the Top Brands to find the best 11 kW solar system with a SolarEdge inverter and module optimizers. Key benefits of a SolarEdge system include better output (2% more in direct Sun; up to 25% more in shade), monitoring of each panel, and ability to mix panels, For home or business, save 30% with a solar tax credit.
SunWattshas a big selection of affordable 11 kW PV systems for sale. These 11 kW size grid-connected solar kits include solar panels, SolarEdge inverter, module optimizers, rack mounting system, hardware, cabling, permit plans and instructions. These are complete PV solar power systems that can work for a home or business, with just about everything you need to get the system up and running quickly. The kit prices shown include hardware components only; click on any kit to add your choice of full-service installation options for rooftop or ground mount.
Because the seasons and weather conditions affect the amount of sunlight hitting your roof, and the amount of sunlight also varies on the time day, you can’t use just the solar panel ratings to predict how much power you’ll get. However, your location will allow you to do some math and determine how well a solar panel works where you are.
A kilowatt-hour is a basic unit of energy, which is equal to power (1000 watts) times time (hour). Your electric bills show how the average number of kWh you use per month.
For example, a 50 Watt light bulb left on for one hour would be 50 Watt hours, and 20 50 watt light bulbs running for one hour would be 1 kilowatt-hour (kWh). According to the U.S. Energy Information Administration, the average monthly electricity consumption for a residential utility customer is about 903 kWh per month.
Divide your average monthly usage by 30 days in a month to get your daily usage. If you’re going by the national average, then you should be using about 30 kWh per day. Next, figure out the average amount of sunlight you get per day. The US ranges from about 4 hours – 6 hours of sunlight per day, on average, see the below map. Let’s estimate you get about five hours per day to generate that 30 kWh you use. So the kWh divided by the hours of sun equals the kW needed. Or, 30 kWh / 5 hours of sun = 6 kW of AC output needed to cover 100% of your energy usage.
This depends in part on the amount of electricity you want to offset with solar power as well as the question ‘how much energy does a solar panel produce’, so in order to get more specific let’s talk about the actual number of solar panels.
Typically, a modern solar panel produces between 250 to 270 watts of peak power (e.g. 250Wp DC) in controlled conditions. This is called the ‘nameplate rating’, and solar panel wattage varies based on the size and efficiency of your panel. There are plenty of solar calculators, and the brand of solar system you choose probably offers one. That said, there is a simple equation to calculate the amount of kilowatt-hours (kWh) your solar panel system will produce.
So now that we know you need to produce about 6kW of AC output, we can work backwards to figure out how many solar panels you need. Solar panels produce direct current (DC), and your home runs on alternating current (AC).
Because of physics, there are losses in converting the energy from the sun into DC power, and turning the DC power into AC power. This ratio of AC to DC is called the ‘derate factor’, and is typically about .8. This means you convert about 80% of the DC power into AC power.
This continues to improve ever so slightly, but the losses are unavoidable… because of physics! So you take the AC amount you need: 6kW and divide by .8 (6kW/.8 = 7.5kW DC). This means that you’ll need 30 250Wp solar panels or 27-28 270Wp panels.
On average, your solar system is going to lose some energy due to wiring, power, inverter efficiency, so you actually end up using 80% of your solar system’s capacity.
To figure out how many kilowatt-hours (kWh) your solar panel system puts out per year, you need to multiply the size of your system in kW DC times the .8 derate factor times the number of hours of sun. So if you have a 7.5 kW DC system working an average of 5 hours per day, 365 days a year, it’ll result in 10,950 kWh in a year.
If you divide your expected 10,950 kWh of annual production by 12, you’ll see that your system will offset about 912 kWh per month from your monthly electric bill, which can translate to $100 or more (in California this would save you about $250) per month depending on how much you pay per kWh!
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