There is an awful lot of confusion (and misinformation) out there about the practicalities of installing solar on a house that has a 3 phase supply. So I&#;ve written this post to clear up the confusion.
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Connecting solar power to a 3 three-phase supply is entirely possible. But you need to decide how you are going to connect your solar system to the grid. Your 3 options are:
1) connect your solar system to only one of your supply phases with a single-phase solar inverter.
2) connect your system into all 3 phases of your supply with a single, 3-phase solar inverter
3) connect your system into all 3 phases with 3 separate single-phase inverters.
Here&#;s what you need to consider in deciding which option to go for:
Three phase billing
Now that Feed In Tariffs are generally between 6 and 10c per kWh, compared to an electricity price of 30c or more, naturally people installing solar want to self consume as much of their solar energy as possible and minimise the flow of exported solar electricity.
So most of the emails I get these days about 3 phase worry that if they choose option 1 they will lose out. They worry that any electricity they use on the 2 phases that are not connected to solar will all be imported at 30c per kWh no matter how much solar they are generating on the solar phase.
I have personally never seen an installation where this happens. All the 3 phase meters that I have seen take into account the sum of all the electricity being used on all the phases and then subtract that from the amount of solar energy being generated to calculate the import or export amount for billing. i.e. if you are on a stingy FiT, they don&#;t penalise you financially for having a single-phase inverter on a 3 phase supply.
But to muddy the waters, I have seen evidence and heard from some installers that say they have seen 3 phase meters that have been configured to only calculate exports based on the solar phase. So buyer beware!
Three-phase load balancing
Having said the above, it is important to note that it is not unusual for the demand across phases to be unbalanced; i.e. a lot more load on one or two of the phases. For solar financial payback, this is less of an issue (due to the summed billing) however, from a technical perspective, balancing consumption and generation across the phases is a good thing for power quality.
I have seen cases where voltage is problematic on a particular phase causing inverters to trip out; such as where a large pump or cool room is on that phase and presents high start-up demands. In such a case, you should consider putting the inverter on a more stable phase; they don&#;t like unstable voltage or frequency at all.
Ultimately, a bit of instantaneous and energy consumption demand analysis should be considered a prerequisite to connecting solar to three-phase systems. Your utility or perhaps a friendly solar installer can help with this. If you have three-phase, it is even more important that you choose a qualified solar installer to talk to initially, instead of a less qualified solar salesperson &#; who probably hasn&#;t got the electrical background to understand the nuances of multi-phase electricity supplies!
If you have a 3 phase supply, should you get a three-phase or single-phase inverter?
If you are looking for more details, kindly visit OEM 3 phase solar inverter factory.
3 phase inverters start at about 5kW so if you want an inverter smaller than 5kW you are looking at single-phase.
If you want a system with an inverter larger than 5kW then your local Electricity Network may insist that you use more than one phase. The best way to do this is to use a 3 phase inverter.
If you want a solar system with a total inverter capacity larger than 15kW (5kw per phase) then the relevant Australian Standard (AS.1:) says you must balance the phases. The easiest way to do that is simply to use a 3 phase inverter.
If you have skinny wires from your meter to the grid, then you may have a problem with high voltage drops. If the voltage drop is too high you may not be able to install solar. A 3 phase inverter spreads the power across 3 phases, so makes the voltage drop on each wire 3x smaller. So if you have an issue with voltage drop &#; a 3 phase inverter is a good solution.
Otherwise, if you are installing a system and have the choice of one single-phase meter, or one 3 phase meter, the choice is yours. The advantage of a 3 phase meter is that it is a more robust system (lower voltage drops, phases balanced).
We are a 3 phase solar inverter supplier. If you are interested in our products, please contact us now!
Choosing a solar inverter often leaves many users scratching their heads, unsure of which type of inverter to choose when faced with additional conditions. Why is it so difficult for customers to choose inverters? Actually, there are some tricks to choosing inverters for Anern solar power system. Anern solar power system often requires careful consideration in terms of inverter selection. There are several factors to consider.
For most users, the establishment of a Anern solar power system is often considered from a financial investment perspective, providing certain manufacturers with the opportunity to push low-cost inverters to the market. Low-cost is not necessarily bad, as long as it's not based on inferior quality. However, in reality, cheap and inferior are the same thing.
The photovoltaic inverter used in the system is a series inverter, with a small size, light weight, and easy to move and install. They do not require specialized equipment and tools, not to mention distribution rooms. They are usually installed near the photovoltaic module.
Its cost is not external, but internal. The inverter is composed of many components, such as IGBT, fuses, capacitors, sensors, relays, diodes, microprocessors, resistors, etc. Don't underestimate the differences in components from different brands. In addition to the inverter panel processing, the size of the display screen also varies greatly.
For most inverter manufacturers, their brochures claim that the highest efficiency of each inverter can reach nearly 98%, or even higher. The efficiency of the inverter is the basic guarantee for photovoltaic power generation and user benefits. The main difference in the efficiency of different brands of inverters lies in system optimization and line loss. In the user system, a group of inverters are commonly used, with each group of batteries in series inputting to one inverter. The inverter and battery input series are independent MPPT, ensuring that when each group of series supplies the maximum power, even if one group is disconnected due to insufficient solar radiation or malfunction, the other group is not affected and can continue to supply power normally.
We mentioned that the inverter is composed of so many components, and the performance of these components determines the performance of the inverter. In the system, the inverter usually has an IP65 protection level.
The operation of the inverter is a process of heat dissipation. While continuously supplying power, a large amount of heat is generated. There should be enough convection space around the inverter to dissipate the heat. The system usually relies on natural cooling and does not require fans. Large frequency converters are often equipped with cooling fans.
Although the Anern solar power system inverter has a protection level ofIP65, long exposure to harsh environments can affect its service life and power generation. In order to maintain stable operation of the inverter for 10 or 20 years, its "care" is essential. A sunshade is typically installed on top of it.
By selecting the inverter for the entire photovoltaic inverter based on the actual installation conditions of the user, not only can engineering costs be saved, installation conditions can be simplified, and the installation period can be shortened, but the efficiency, reliability, and low cost principles of the power generation system can also be effectively improved.
Are you interested in learning more about OEM 3 phase solar inverter company? Contact us today to secure an expert consultation!