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Solar Inverter!! Power cut off has become a routine in India. Excessive load on the grid and uneven power distribution across the grids are some of the various reasons. The end-user has definitely affected adversely and a substitute to the main supply is the only preferred option. Inverters are designed to satisfy this very significant need. With the use of solar inverter, you will get the extra benefit of off-grid power generated by the sun which is absolutely free and you can cut down your electricity bills on a monthly basis.
What is a Solar Inverter?
Inverters assume a vital part in any Solar vitality framework. It is the cerebrum of any solar vitality framework. Regardless of whether it’s a 2-kW private framework or a 5-MW business control plant, every one of them requires inverters. As the name recommends, a solar inverter “transforms” the immediate current to substituting current, in this way making it usable. Exchanging current is the standard utilized by every single business apparatus, and henceforth inverters are viewed as the portal between the PV framework and the vitality off-taker or burdens/machines.
Types of Solar Inverters
1. Off-matrix Inverters:
Off-matrix inverters, otherwise called remain solitary inverters, don’t should be snared to a solar panel. Rather, they draw the DC control from batteries which are charged utilizing PV exhibits or different assets like motor generators, hydro turbines, and wind turbines. Since these inverters are disconnected from utility networks, they don’t require against islanding insurance. Further, they can’t send out abundance sunlight based power into the matrix. Off-lattice inverters discover use in remote zones or when individuals need to live totally autonomous of the network.
2. Lattice tied Inverters:
Lattice attached inverters are associated with a utility matrix and capacity by coordinating their recurrence with that of the utility network sine wave. They are intended to naturally close down in case of a power cut for security reasons. Consequently, they can’t supply control amid a blackout.
3. Battery-Hybrid Inverters:
These are a blend of the over two inverters, which enable you to be generally autonomous of the matrix yet additionally synchronize with it if there should be an occurrence of low sunlight based or high utilization days. Commonly such inverters first charge the associated battery and after that fare any abundance capacity to the network. Likewise, during the evening/cloud days – these inverters are sufficiently brilliant to first utilize the put away power for the utilization and after a specific limit, energize the battery through the matrix. Because of matrix adjusting, they should be introduced with the counter islanding insurance. These are an awesome answer for Indian purchasers, however, regularly the utilities are not strong of giving a net-metering association with these mixture inverters and the directions around the same are hazy.
4. String Inverters:
This is the most regularly utilized sunlight based inverter for homes and business purchasers. These are straightforwardly associated with the network and regularly don’t bolster a battery go down. They are high performing inverters, frequently with 25-year outline life and 5 years guarantee. The great inverters have 97 – 99% transformation from DC to AC. The less refined ones will just give around 90-92% transformation on the ground. The execution distinction is reflected in the cost and workableness ordinarily. Arvis’s prescribes high change gadgets just to anticipate 5-6% constant misfortune on the transformation which isn’t fitting for absolutely financial reasons. These originate from 1KW to ~60KW commonly.
5. Miniaturized scale Inverters:
Microinverters are little in size and limit than the standard string inverters. The last ranges from 1.5-5kW in a measure for private applications, the previous is more often than not around 200-350W in the estimate. Not at all like the string inverters, these needn’t bother with a variety of boards to change over the DC. These are introduced on the back of each board and are in charge of the transformation of the board on which they are introduced. These are marginally expensive yet better for regions that have fractional shading. These are likewise on-framework or network associated inverters.
6. Focal Inverters:
These inverters are commonly utilized as a part of MW scale plants. They are tremendous, have their own rooms with debilitating, and so on. They have extraordinarily proficient and have substantially more framework related highlights like adjusting, vacillation administration, and so on. Not at all like String inverters, these begin from 400KW regularly.
Think about the auto motor, while choosing your inverter. It’s specialized, yet the vast majority can comprehend the cost-execution measurements of motors and settle on an informed choice according to their necessities and spending plan.
Uses of a Solar Inverter
The main uses of a solar inverter is to convert the DC electricity flowing from your solar panels into usable AC power that your home appliances use. However, they have three other jobs, too.
- Ensuring the production of plentiful, clean power
Solar panel inverters are responsible for continually tracking your solar array’s voltage to figure out the maximum power at which your solar panels operate, ensuring the system produces the most and cleanest power at all times.
While off-grid inverters typically rely on cheaper modified sine wave technology, grid tied home solar inverters create a more pure sine wave of AC electricity, to ensure your sensitive home appliances function smoothly and efficiently.
- Communicating with the utility grid
Solar inverters need to interface with the grid. Inverters ensure that, in the event of a temporary power outage, no power from your solar panels winds up making it out to the transmission lines outside your home. This prevents line workers who may be troubleshooting or repairing wires from getting zapped.
Your inverters also feed power loads into the grid when your home doesn’t need the power or your batteries are full (if you have them connected to your solar system).
- Arc detections and hazardous shut downs
Inverters are also required to shut down when they detect a hazardous electrical arc, which is caused by system aging and material degradation within your home’s wiring and solar panels. Some inverters perform better than others at safety shutoff.
IP rating stands for Ingress Protection Rating. The IP rating is a measure of how well your inverter is protected from dust, water, etc. Inverters are subjected to harsh conditions such as high temperatures, water, dust and fluctuating voltages. The IP rating of an inverter will tell you how well your inverter is protected from such harsh conditions.
The IP rating is a double-digit number, and each digit stands for certain protection that the inverter offers. The infographic below will help you understand this better.
The efficiency of the solar inverter is another important parameter to consider while buying a solar inverter. The efficiency of the inverter determines how much of the energy produced by the solar panel is converted into usable AC power. Part of the DC power that comes to the inverter is lost due to the production of heat and a few other losses. Hence, the greater the efficiency of the inverter, the lower will be the losses.
But the efficiency of an inverter increases with an increase in the power used by you. This means that when very little power is being utilized the efficiency of the inverter may be somewhere around 50% and can go over 90% when the output approaches the inverter’s rated output.
Hence, most manufacturers give a peak efficiency value, which is the highest efficiency that the inverter can attain. Higher the peak efficiency, the more the output.
Inverters are capable of producing outputs having various waveforms such as sine wave, square wave, modified sine wave, etc depending on the circuit design of the inverter. An inverter that produces a true sine wave is what you should be looking for.
A true sine wave is more efficient, especially when powering inductive loads. Other waveforms could use up to 20% more power when powering such loads. This excess power user can also reduce the life of the appliances you use, due to overheating. Hence, a true sine wave output producing inverter is what one should be looking for.
- Power Consumption of Solar Inverters
The charging segment should efficiently use energy. Solar energy is required to charge the batteries of Solar Inverter. In case the charging unit is not energy efficient then it may lead to wastage of electricity even when the battery is completely charged.
- Duration of the Battery Backup
One of the vital point to check is the duration for which the inverter can provide the facility after starting it for the use. You can calculate the duration that it can last for by using a simple formula.
The formula is given below:
Time = Battery Voltage x Battery Capacity x Inverter Efficiency / Load
(Battery Voltage in Volts, Battery capacity in AH, Load in VA)
For example: If the battery voltage is 15 Volts and Battery capacity is 160 AH, and you have to keep running a table light of 50 watts, small bed light of 30 watts, and a fan of 80 watts. The inverter’s efficiency is only 80%. You can calculate the duration of the battery for which it will last by using the above formula.
15x160x0.8/160(total load) = 12 hours
Solar inverters are the brains behind your solar power system. Therefore, give it a good thought before making your final decision. The solar inverter should be capable of drawing the best out of your solar modules while being highly efficient. A good inverter should have high efficiency, produce a pure sine wave output, and have a good IP rating. Maximum Power Point Tracking (MPPT) would be a huge added bonus as well. Having said that, you should also keep in mind your requirements and choose accordingly.