Why have 3 Mppts inverters between 6 to 10kw become so popular in Australia？
If you are considering installing a solar energy system for your home, you may want to know what is the best system size for you. According to industrious experience, a 6.6kW solar system not only is affordable, but also meets the approval process and export licensing (receiving feed tariff) requirements of most Australian power grids. For families with an adequate budget, many of them may choose 10 to 13.3KW solar energy system.
The following factors may determine a family’s choice of solar and inverter size:
1. The size of your house, that is, the roof area.
2. Your household electricity consumption.
Of course, it is easy to overlook that:
3. Compliance with Australian safety requirements.
About the first point:
The mainstream real estate product in Australia is a house with land, which is an independent house. The 2021 census shows that more than 80% of Australians live in such a house or a unit with a separated piece of land.
Such kind of house usually has a roof with three orientations – This in turn requires an inverter to have three MPPTs.
Here we briefly explain the role of the MPPT:
MPPT, Maximum Power Point Tracking (MPPT) system is an electrical system that enables photovoltaic panels to output more electric energy by adjusting the working state of electrical modules.
Put it in simple words, it is only with it that the electricity generated by the solar panel can be captured as much as possible into the inverter for use.
Each MPPT system can only track solar panels in one direction, so when your house has three roofs orientations, you need inverters with Three mppts to ensure that the working efficiency of all facing solar panels is tracked by Mppt and the efficiency is maximized. The roof condition shown in the following figure is very common in Australia.
According to a survey, the electricity consumption is not only related to the living standard and way of the family, but also related to the place of the house.
The per capita electricity consumption of East and South Australia is obviously higher than that of Western Australia. The average daily consumption of a family is about 24KWH-30KWH.
Sourced by https://www.finder.com.au/how-much-energy-does-the-average-home-use
Most families now have smart appliances, electric cars, etc. If there are several children who stay at home all the time, they may need more electricity to power the entertainment facilities. Of course, your power consumption may also depend on your future plans, such as whether to add an electric car or a swimming pool pump, etc. Australia ranks first in the world in terms of per capita pool ownership.
Many homeowners do not run the water pump and filter during the night when the electricity charge is cheap, as the noise is too loud and running the pool eight hours a day means a very high consumption of electricity.
Therefore, when the daily consumption of a family is 25KW, a 6KW inverter is required. Under perfect conditions, a 6KW inverter can generate 6kwh of electricity for one hour at full capacity. In a word, it can generate 24kwh of electricity for one day. Under perfect conditions, a 10KW inverter can generate 10kwh for one hour at full capacity. In general, it can generate 30-40kwh per day.
Therefore, when the household budget is insufficient to a support high-power inverter, 6KW is appropriate to meet their needs. If the budget is sufficient, or the household consumption is large, high-power inverters are the choice, and the surplus electricity can be to fed into grid for yield.
3.The point most important and easily overlooked: Local grid requirements
You may use single-phase electricity in your home, that is, there is one live wire from the grid to your home. Or three-phase, that is, there are three live wires from the grid to your home. Single phase electricity is most common though.
For example, the requirements of some power companies in New South Wales are as follows:
In the requirements of Essential Energy, 5KW inverter can be installed in each phase, but in rural areas, there is maximum installation limit and output limit of 3KW/phase. However, it is stipulated in the installation rules that the number of photovoltaic panels that exceed the specified limit by 33% can be installed, that is, 5 * 1.33=6.66KW. Therefore, it can be seen in New South Wales that many solar photovoltaic installers recommend the size of 6.6KW.
However, in some regions, such as Queensland, there is restriction of the installation of inverters with a maximum power of 10KW, but the output to the power grid is limited to 5KW. In this case, a maximum of 13.3KW photovoltaic modules can be installed. This situation is especially suitable for families with swimming pools, high power consumption air conditioners and other power consuming electrical equipment at home, which can not only meet their own needs, but also output electricity to the power grid. Therefore, for such a situation, it is more suitable to install 10KW inverter.
Next, we can compare the performance of some models of mainstream brands in terms of MPPT.
You may notice that there is other data in our comparison table, that is MPPT voltage range. In Australia’s latest safety regulations, there is a requirement that the input voltage of inverter should not exceed 600V. What is the role of this voltage range? It is used to determine the number of photovoltaic panels in series. That is to say, the larger the range, the larger the number of photovoltaic panels that can be installed in each direction of your roof. When the minimum voltage of MPPT is as low as 80V, three photovoltaic panels connected in series are able to start the inverter for operation. When the MPPT voltage is as high as 600V, on one roof direction, 14 photovoltaic panels can be connected in series to output power to one string of DC input of the inverter. When there are two strings on one MPPT, two groups of photovoltaic panel array with the same number and brand can be installed on roof in the same direction. This may sound a little complicated. To put it simply, the more the quantity, the better it is.
This is one sting of DC input
On one sting of DC input, the maximum number of photovoltaic panels that can be connected depends on the MPPT voltage range of inverters.
So, as a very important member of the inverter, MPPT provide so many powerful functions to the inverter. Only when the voltage range of MPPT is large enough, the number of MPPTs is large enough, and the more the strings in each MPPT, the inverter can deliver more benefits to the family, which means that it can be applied to roofs of different types and orientations, and accommodate more photovoltaic panels on your roof!
Let’s recap here –
- The Each Energy Single phase 6-10KW inverters have 3 MPPTs
- Each Energy Three phase 5-30KW inverters have 3 MPPTs
- Each Energy is the only brand that has 3 MPPTs for Three phase 5-15KW inverters. For the above diagrams roof tops, three phase inverters with 3 MPPTs are needed. Each Energy is the only brand that meets the need.