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subsidy area

Harayana

Maharastra

Telangana

Andhra Pradesh

Karnataka

Pre-approved subsidy ~30%

Available for solar systems to be installed on roofs of below categories of customers:

Residential

All types of buildings

Applicable states

Institutions
  • Educational Institutions
    • Schools
    • Universities
  • Health Institutions
    • Hospitals
    • Medical College
Type of System :

Grid-connected solar systems (without batteries)

System Sizes :

5kW, 10kW, 15kW, 20kW, 25kW

Features :

Included (remote Monitoring System + O & M for 5years)

Payback

31/2 Years to 41/2 Years

Return on Investment

20% to 25%
Contact us

+91 99013 30955

leave details below

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Inverter(UPS) & Battery Packages for home & office equipments

Choose from Pre-Engineered Non-Solar Kits

The inverter can only use grid power to charge the batteries

Choose from Pre-Engineered Solar Compatible Kits

Provides the flexibility to add solar panels in future without having to replace the inverter.

Build your Own Inverter Battery Combo

Brands Available

Why Us?

Inverter

FAQs

What is the difference between an inverter and a UPS?

An inverter is a device that converts DC (Direct Current) power into AC (Alternating Current) power. For example, a 12V inverter will convert battery power available at 12V DC into AC power at 230V in India.

UPS (Uninterrupted Power Supply) is a device that normally provides back-up power supply for any electrical gadget. To do this, the UPS typically includes the inverter, battery and battery charger in one standalone unit. UPS units also provide protection against many electrical problems like over-voltages, brownouts, power surges etc. and in certain cases also communicate with the equipments they are powering.

We often use the terms interchangeably in India, as given our need for back-up power, a standalone inverter (that converts only DC power to AC power) is often not very useful and we invariably need a device that is also equipped with a battery charger and hence, a UPS.

What are the different types of Inverters available?

Inverters are classified into different types based on the waveform of the output AC power they generate. The dominant waveforms generated by commercially available inverters are – square wave, modified sine wave (also known as quasi-sine wave) and sine wave (also known as pure sine wave). A comparison of the three waveforms is shown below:

Sine wave is the most superior waveform (as it matches the waveform of the AC power that we get from the utility grid) and inverters that generate this waveform are typically more expensive while square wave inverters require minimum circuitry and hence are the cheapest. With the prices of sine wave and modified sine wave inverters coming down and the increasing need of providing back-up power and protection to sophisticated electronic devices square wave inverters are gradually being phased out.

To buy inverters for 1-2BHK homes or, small offices, click here

To buy inverters for 3 – 5 BHK homes, or, medium-sized offices, click here

To buy inverters to run high power consuming appliances such as air conditioners, pumps, click here

To buy inverters to run sensitive office and home equipments such as servers, home theatre systems, click here

What are the different kind of appliances that should be used with square wave, modified sine wave and sine wave inverters?

The suitability of a particular waveform in an inverter depends upon the type of load the inverter is being connected to and the nature of usage (whether it is for continuous use or emergency use). A general comparison of the inverters based on the different waveforms is offered below:

 

Inverter waveform

Square wave

Modified sine wave

Sine wave

Loads suitable for

Lights and fans only Lights, fans, Personal Computers, TVs (there might be electrical noise in case of some models, check the specific inverter model), other household appliances All kinds of loads including sensitive electronics

Harmonics/Audible noise

High Medium Low

Price

Low Medium High

 

Sine wave inverters:

The major advantage of a sine wave inverter is that it ensures trouble-free and efficient operation of all electrical and electronic equipments. Please note:

  • Certain appliances like sensitive medical equipment, audio/video electronics, household appliances such as variable speed drills, bread makers, light dimmers and battery chargers require waveforms with low harmonic distortion and should be connected to only sine wave inverters.
  • Many inductive loads, such as appliances containing motors also produce full output only when operated with true sine wave power.
  • Sine wave inverters also have a higher surge power tolerance and are able to cater to the higher surge current drawn by inductive loads during start-up.

Modified sine wave inverters:

These inverters provide a good value proposition as while not as expensive as sine wave inverters, they still are compatible with a broad range of electrical gadgets used at home or office such as TV, computers, printers etc. Please note:

  • When modified sine wave inverters are used to power inductive loads, such as appliances having motors, solenoids, compressors, pumps or relays, the loads tend to consume about 10-20% more power than when powered with true sine wave power.
  • Appliances with electronic timers and/or digital clocks will often not operate accurately due to the noise in a modified sine wave compared to a pure sine wave.

Square wave inverters:

These inverters are the cheapest and are typically suitable for running lights, fans and other devices that are not impacted by the harmonics present in this waveform. It is important to not connect square wave inverters to sensitive electronic appliances as they might cause irreparable damage to them.

What criteria should I use for selecting an inverter?

In order to maximize the output power (AC power) that an inverter can generate from a given amount of input power (DC power), it is important to select an inverter with the following characteristics:

High efficiency

– For details on this see question below

Low standby losses

– These losses are due to the power consumed by the inverter when it is on but no loads are running. This is the case in most residential situations, so it is important to select an inverter where these losses are a minimum.

High surge capacity

– Many household and office appliances, especially those with motors consume high power when they are switched on. If the inverter does not have sufficient surge capacity to support these loads then the inverter will shut down and could potentially get damaged as well.

Low harmonic distortion

– Harmonics can lead to performance problems in motors and sensitive electronics and also impact the useful lives of these equipments, hence it is always advisable to minimize the harmonic distortion caused by the output power produced by inverters. As mentioned in the table above, sine wave inverters have low harmonic distortion while square wave inverters have the highest harmonic distortion.

Learn more about the inverters suitable for different types of appliances, here

What is inverter efficiency and why does it matter?

The efficiency of an inverter determines the amount of AC output power it generates for a given input of DC power. This usually ranges from 85% to 95%, with 90% being about average.

When running such things as motors, the efficiency actually has two parts to it – the efficiency of the inverter, and the efficiency of the waveform. Waveform efficiency means that most motors and many electronic appliances run better and use less power with a sine wave. Typically, an electric motor (such as a pump or refrigerator) will use from 15% to 20% more power with a modified sine wave than with a true sine wave. Thus when choosing an inverter based on efficiency, you should also consider the type of loads being powered to determine true system efficiency.

Learn more about different types of inverters here

What is the difference between the “VA rating” and “W rating” of an Inverter/UPS?

The capacity of an Inverter/UPS is specified in terms of its VA rating and W (Watt) rating. The Watt rating relates to the amount of power it can deliver, and the VA rating relates to the amount of current it can deliver. Neither the VA nor the W rating of an Inverter/UPS can be exceeded.

The Watt rating of a load represents the “actual power” consumed by it while the VA rating is the “apparent power” consumed by it and is larger than the actual power due to some currents called reactive or harmonic currents that flow in and out of loads without actually delivering any power to it.  The ratio of the actual power to the VA rating is also called the “Power Factor” (PF). For many types of electrical equipment the difference between apparent power and actual power is very slight and can actually be ignored, but for some computers the difference is very large and important. In a study done by PC magazine, it was found that typical personal computer systems exhibit a power factor of 0.65 which means that the apparent power (VA) was 50% larger than the actual power (Watts). Normally most Inverter/UPS can handle loads with power factor ranging from 0.7 to 1.

The best approach to size an Inverter/UPS is to use the Watt rating of the load and ensure that the Watt rating of the Inverter/UPS is greater than the VA rating of all the loads put together. This ensures that even if you don’t know the power factor of the individual loads, the Inverter/UPS capacity has the requisite safety margin built into it.

Size your inverter capacity by selecting the appliances you would like to connect to the inverter here

To learn more about different types of inverters, click here

How should I select the right inverter capacity?

You can use our inverter sizing tool to find out the capacity of inverter you need for your home or office.

The tool allows you to pick your appliances along with their wattages and calculates the suitable inverter capacity taking into account an additional buffer you would like to provide for additional loads you might want to connect to the Inverter/UPS in future.

Learn more about the inverter sizing tool and how it works here

What is an UPS and where is it normally used?

UPS stands for Uninterrupted Power Supply and is used for two primary purposes – Protecting computers and other sensitive loads from damage or loss of data caused by Line (Mains) power disturbances, and secondly to provide back-up power to critical loads when the primary power goes down. Different types of UPS differ in the extent and the manner in which they serve the above two purposes. Learn more here

What are the different types of UPS available?

UPS systems are classified into different types based on their topology, or, electrical design used.  These are Offline UPS (also known as Standby UPS), Line-interactive UPS, and Online UPS (also known as Double Conversion Online UPS). The three topologies differ mainly in the level of power conditioning they provide when operated on utility power and on battery power.  These topologies in the order of increasing quality of power they provide are: Offline, Line-interactive and Online.

Learn more about how an offline UPS works here

Learn more about how a line interactive UPS works here

Learn more about how an online UPS works here

See a comparison of the different types of UPS here

What is an Offline UPS, how does it work, and what are its advantages and disadvantages?

The Offline UPS, or, Standby UPS as it is popularly known is the most common type of UPS used primarily for Personal Computers.

 

In normal use, the UPS connects the power line directly through to your computer and its battery charger draws only a slight current to keep the UPS battery topped off. When the power fails, the UPS switches into action – and switch is the key word. A relay inside the Offline UPS switches the wires that go to your computer from the wall outlet (passing through the UPS) to an inverter connected to the battery pack inside, or, outside the UPS. The inverter then supplies power to your computer with the batteries as the energy source. The inverter only starts when the power fails, hence the name “standby”.

The topology of the Offline UPS is shown below:

                              Offline UPS topology

The switching process requires a small but measurable amount of time. All available off-line UPSs switch quickly enough that your computer never notices the lapse. Most off-line UPSs switch in 3 to 10 milliseconds (one cycle in a 50Hz environment is 20 milliseconds).  Even the slowest off-line UPS has a safety margin when it comes to switching time.

The main drawback of the off-line UPS is that it offers very limited protection against power problems. Only a few UPS manufacturers add filters and surge circuitry that provides adequate noise filtration and surge suppression to electrical disturbances from the grid power, but the offline topology in general cannot cope with sustained over-voltages or prolonged sags. The protection against under-voltage problems is limited to switching to battery back-up power – which means that the battery capacity limits the protection period.

The advantages of the offline UPS are its low cost and high efficiency (typically 95% – 98%). It is not a complete power protection solution but given its cost and efficiency, serves the purpose of protecting your computer against a single power problem – the outage.

To buy an offline UPS click here

What is a Line-interactive UPS, how does it work and what are its advantages and disadvantages?

The next step up the UPS ladder is the line-interactive UPS and it is the most common topology used for small business, web and departmental servers.

In the line-interactive topology, the inverter is always connected to the output of the UPS. Operating the inverter in reverse during times when the AC power is normal provides battery charging. When the input power fails, the transfer switch opens and power flows from the battery to the UPS output. With the inverter always on and connected to the output, this design provides additional filtering for incoming power compared to the standby topology.

In addition, the line-interactive topology also incorporates a multi-tap transformer to buck (reduce) or boost (increase) the voltage, thereby providing some degree of voltage regulation (also known as “Automatic Voltage Regulation”) as the input voltage varies. Voltage regulation is an important feature when low voltage conditions exist, otherwise the UPS would transfer to battery power and frequent battery usage can cause premature battery failure. The buck or boost range is typically limited to 10% and while some models will provide both buck and boost other less expensive models will just provide boost capability.

The topology of the line-interactive UPS is shown below:

Line Interactive UPS topology

The inverter in this topology can also be designed such that its failure will still permit power flow from the AC input to the output, thereby eliminating the potential of single point failure by providing two independent power paths.

High efficiency (typically 90%- 96%), small size, economic price point coupled with the ability to correct low or high line voltage conditions make this the dominant type of UPS in the 0.5-5 kVA power range.

To buy a line interactive UPS click here

What is an On-line UPS, how does it work and what are its advantages and disadvantages?

This is the most common UPS topology above 10kVA and is designed to provide continuous power protection against all power problems to mission critical equipment in data centers and server rooms. This topology ensures a consistent quality of power supply regardless of disturbances in the incoming mains. There are actually 2 sub-categories of On-line UPS known as – Double Conversion On-line and Delta Conversion On-line, with the former being the more popular technology.

In the Double Conversion On-line topology, the primary power path to the loads is the inverter instead of the AC mains, thus the inverter is ON 100% of the time and hence the term on-line. The name double-conversion arises from the operation of the device. It first converts line voltage (AC) into battery-compatible low-voltage DC using a rectifier. The rectifier supplies power to the inverter in addition to charging the batteries. The DC from the batteries is then converted by an inverter back to the highly controlled and regulated AC. This process thus effectively removes any electrical disturbance on the utility (input) side of the UPS.

The topology of the online UPS is shown below:

Online UPS topology

The Double Conversion UPS is the only truly uninterruptible system because the inverter is always connected to the load and is always drawing power from the battery source irrespective of whether the mains power is present or not. Therefore, during an input AC power failure, on-line operation results in no transfer time. This topology also provides protection against all forms of power irregularity including surges, spikes, over-voltages, sags, brownouts and blackouts. This topology also maintains a significantly closer output voltage tolerance compared to the line-interactive topology as it uses solid-state voltage regulators instead of transformer taps to cope with under and over voltages.

While the Double Conversion On-line topology provides nearly ideal electrical output, the constant wear on the power components reduces its reliability and the reduced efficiency (typically 80 – 90%) results in higher life cycle costs for the UPS.

To buy an online UPS click here

Can you provide a comparison of the advantages and disadvantages of Off-line, Line-interactive and On-line UPS?

Sure, please find below a quick summary. For more detailed explanations, please refer to the questions above.

Topology

Benefits

Limitations

Value proposition

Off-line/Standby

Low cost, high efficiency (typically 95 – 98%), compact Uses battery during brownouts, limited or no protection against power irregularities, impractical over 2KVA Best value for Personal Computers

Line Interactive

High reliability, high efficiency (typically 90-96%), reasonable voltage conditioning Impractical over 5KVA, does not protect against all forms of power irregularities Most popular UPS – ideal for for small office, web and departmental servers and/or harsh power environments

On-line (Double Conversion)

Near ideal electrical output, highest protection against all power irregularities, ease of paralleling Lower efficiency (typically 80 – 90%), relatively more expensive under 5kVA Default choice for providing back-up power and protection to mission critical equipment and servers at data centers

To learn about the working principle of an Offline UPS click here

To learn about the working principle of a Line interactive UPS click here

To learn about the working principle of an Online UPS click here

 

Can you provide a comparison of the extent of protection against power irregularities provided by Off-line, Line-interactive and On-line UPS?

Sure, please find below the summary based on the typical features available in each topology:

Power Problems

Off-line
UPS

Line-Interactive
UPS

On-Line
UPS

Low Voltage

No Protection / Limited Protection Limited Protection Highest Protection

High Voltage

No Protection / Limited Protection Limited Protection Highest Protection

Blackout

Highest Protection Highest Protection Highest Protection

Noise Interference

No Protection Limited Protection Highest Protection

Surge

No Protection / Limited Protection Limited Protection Highest Protection