6.6 kw solar system

6.6 kW solar system

A 6.6 kW solar system is a medium-sized system perfect for family homes, small commercial buildings or larger homes with less energy usage.

Preparation: 18 Tier 1 solar panels, CEC approved 6.6 kW inverter, installation by qualified retailer.

It is known that electricity bills are a great expense each monthvfor many families in developed countries. Rising tariff costs have driven many homes, offices, and commercial enterprises to seek more cost-effective ways to power. A 6.6 kW solar system is an excellent alternative and is widely suited to many homes.

6.6 kW systems can provide more than the total energy consumption of the average home, making it an obvious, and relatively inexpensive way to reduce your energy bills.

6.6 kW Solar System

1: Is a 6.6 kW Solar System Suitable for My Home?

A 6.6 kW solar system is suitable for medium-size homes with an energy bill between $400-$600 per quarter. Determining household energy needs by the number of people in your home can be unreliable, but as a rule of thumb, an average 4-person household will be best suited to a 6.6 kW household.

If your home does not have ducted air conditioning, a heated pool, or regularly uses large white goods appliances, then a 6.6 kW system could cover your usage needs. If you have an energy-hungry home and use more than 20-30kW a day, a larger system may be better suited.

It can comfortably supply 20 kWh daily for an average household of four to five occupants.

If your home has a north, east, or west-facing roof with enough space, then a 6.6 kW solar photovoltaic system will suit your home.

2: How Many Solar Panels are in a 6.6 kW System?

The number of panels in a 6.6 kW system depends on the wattage and size of the panel. A 6.6 kW system produces 5000W of power. So, the number of panels, multiplied by the wattage of each panel, needs to equate to 5000W. On average, there are between 13-20 panels in a solar system, depending on the output of the solar panels themselves. The wattage of the panels produced nowadays is as high as 400 W.

Below is a table showing the average number of panels needed for 6.6 kW system related to the power output of the panels:

Panel Power Output            Number of Panels for a 6.6 kW System











The higher each panel’s wattage, the fewer panels a 6.6 kW system will require.

3: Do I Have Enough Roof Space for a 6.6 kW Solar System?

If your home is suited for solar, you’ll need a roof sapce between 25 – 35 m² to install a 6.6 kW solar system.

Solar panels come in various sizes, depending on the manufacturing company, as we mentioned above.

A panel measures 1.7m x 1m in size. It consists of 14 to 20 panels, based on the wattage.

For instance, you may plan to install a solar system with 370 W per panel. In this case, a 6.6 kW system will consist of 14 solar panels.

To determine if your roof has enough space, first, you need to know if your roof is suitable for solar, if it has multiple orientations or if it is made of hazardous material.

4: How Much Does a 6.6 kW Solar System Cost?

The below table shows average solar panel of per kW costs of some countries.

Solar Energy Cost By Country 2021
Solar Energy Cost By Country 2021

Therefore, the rough cost of 6.6 kW solar system in Germany should be —$1113*6.6=$7345.8

Likewise, the rough cost of 6.6 kW solar system in France should be—$1074*6.6=$7088.4

There are three important factors that influence the cost of solar panels:

  • Wholesale equipment costs: as a young industry, factories have been able to automate processes, increase manufacturing and logistics scale and reduce the cost per watt of a solar installation dramatically.
  • Compensation: In order to encourage households to select solar energy, government implements intriguing policies to attract citizens to select solar energy, such as The Solar Rebates. The introduction of local solar rebate schemes. In particular states, there has had a dramatic effect on the cost of solar.
  • Competition and Cheap Solar: there are thousands of contractors to install solar. As a result, the margins have been forced to be very slim in the market.

5: How Much Will a 6.6 kW Solar System Save You?

On average, a 6.6 kW system will save the homeowner $56,521 during the course of its lifetime, with an average annual savings of $1,222.0 per year. The actual amount a homeowner will save is dependent on the amount of power used in the home, the orientation of the solar panels, and the quality of the system.

This is because a 6.6 kW solar system will produce on average 21 kWh per day; multiplying that by the number of days in a month (30), and this will amount to 630kWh of energy (21kWh×30=630kWh); multiplying that by the number of days in a year (365), and this will amount to 7,200 kWh of energy (21 kWh x 365 = 7,665 kWh).

The average price of electricity in Germany is 0.333 U.S. dollar per kWh for households and 0.260 U.S. dollar for businesses. Now, if your household somehow used all of the 7,665 kWh of energy produced by the solar system in one year, you would still reach an annual saving of $2552.445. As you can see, the electricity price in these countries are very high, so the solar energy is a great alternative.

Even if you do not run out of all the power they produce, you can still save a lot of money in the long term because  you do not need to pay electricity bills.

6:What is the Payback Period for a 6.6 kW Solar System?

This figure depends on where you live, your cost of electricity, your feed-in tariff, and your daily energy usage.

To determine how long it would take to pay off a system, you must calculate the total monetary value of the energy produced by the system on an annual basis, and divide the cost of the system by this figure.

You can do this by figuring out what the cost of power is, how much you will export, and use in the home, and what your daily savings are. 

7: How Much Power Does a 6.6 kW Solar System Produce?

A 5kW solar system generates 21kWh of power per day on average. The actual amount a 6.6 kW solar system produced on a given day is impacted by the average sunlight received in your area, the weather, and the orientation of your solar panels.

A peak sun hour is the equivalent amount of sun received during the middle of the day.  A 5kW system will produce 6.6 kW of power for every peak hour, so over 4.2 peak sun hours, a system will generate roughly 21kWh(4.2*5kW=21kW)

The amount of direct sunlight available in your location is the primary concern in calculating how much power your solar panels will generate, as the weather and climate will impact the total sunlight absorbed by the panels. For example, clouds or overcast weather can drastically reduce a system’s production.

8: How Long Will a 6.6 kW Solar System Last?

High-quality 6.6 kW solar systems come with a warranty of at least 25 years, and an estimated lifespan of 30 years. This doesn’t mean that the system will stop producing energy after 25 years. It just won’t be as energy-efficient as it was previously. This is because panels degrade over time due to exposure to the sun’s heat and light. This is referred to as Light and Elevated Temperature Induced Degradation. Higher quality panels are more resistant to this degradation and perform at their peak for longer.

A report by the National Renewable Energy Laboratory (NREL) in 2012 reveals that solar panels degrade by 0.8% per year on average. As long as external forces don’t damage the panel, the system will continue to serve you for between 25 to 40 years. By year 25, a solar panel is expected to perform at 80% of its original efficiency.

You should also consider inverter degradation. Residential solar inverters have shorter lifespans. They normally last about 10-15 years (with 5 to 10-year warranties). This means you will have to replace your solar inverter sooner than the actual panels.

You can extend the longevity and performance of a solar system through proper maintenance and cleaning.

9: Will a 6.6 kW Solar System Power Your Home?

A 6.6 kW solar system is certainly powerful enough to cater to the average electrical needs of a four-to-five person household.

However, power compatibility depends on:

  • Utilities and home appliances that consume energy. Therefore they determine the maximum power usage in your household.
  • Your lifestyle. If you work at home, you’ll consume power all day.
  • Any electrical vehicles you own. If you have a Tesla or plan to buy one, a 6.6 kW solar system won’t be enough to power both the car and your household.
  • Your average daily energy usage during summer and winter.

Your solar system power compatibility depends on the above-listed factors and how these align to installation in your area.

To understand if a 6.6 kW system can power your home, you’ll divide your average daily usage by the local peak sun hour. You can find your average daily use on your electricity bill.

Average daily usage (kWh) / the local peak sun hour=Your recommended solar system size. Once again this is because a system will produce the times of the local peak sun hour its size in power per day.

If the kilowatt per hour displayed on your home electricity bill shows you consume 20 kWh per day, and the peak sun hour is 4 hours, a 6.6 kW solar system will be enough. Anything higher than 20 kWh usage per day implies it won’t be sufficient.

10: Can I Install a Battery with a 6.6 kW Solar System?

The short answer to this question is yes.

Installing battery storage systems with a 6.6 kW solar system will enable you to use more of the energy you produce.

According to reports, installing a 5 kWh battery with your 6.6 kW system for everyday use can boost the amount of self-generated solar power a household consumes from 30% to 60%.

That’s a considerable increase in the amount of self-generated solar power.

But whether you should install a battery depends on your budget, energy usage, and more.

If you plan to reduce your carbon footprint, save money or reduce your home electricity bills, installing a battery with a 6.6 kW system is an excellent first step. But you should also consider the additional cost of battery installation, your payback period, and how much you are likely to save over time.

11: Should I Consider a Larger or Smaller System?

A few things to consider before going solar are available space, energy needs, cost, and your overall aims for solar system installation.

A smaller system will produce less electricity than a larger system. Whether you’re a two-person household with low energy consumption, a smaller 5kW system will be plenty for daily use.

But if you want a system that will generate extra power or maybe you plan to buy an electric car in the near future, a larger system is the better option in either situation.

The cost is also an important factor since larger solar systems will cost more than smaller solar systems, impacting the payback period.