Undoubtedly, the Charging Section is the most important area of UPS as it defines the Charging time.

To understand the charging time, one has to understand the capacity of the charger, which has been designed by us so that it charges in the defined period.

There are multiple types of batteries available in the market, which have advantages and disadvantages; accordingly, we charge them based on their characteristics.

For example, if we have to charge a Tubular Lead Acid battery, we have to take a minimum of 10 hours before we completely charge it.

If we try to charge faster, then these Batteries will be short-lived and need frequent water topping.

If we have to charge the Valve Regulated Lead Acid Batteries, which are called sealed Maintenace Free batteries, they need to be charged in 6 to 8 hours, and if we try to charge them faster than that, their life is also reduced.

In the case of Lithium batteries, we can charge them in 2 to 4 hours and they are designed like that and they have a double or 5-time life compared to Lead Acid batteries.

It’s very important how the charger of a UPS is designed to take care of the battery as the life of the battery will majorly dependent on the charger technology.

Our UPS has a charging capacity of 15 Amp, which can charge the 150 Ah battery in 10 hours and the 200 Ah battery in approximately 13 hours. So the size of the charger is very important to check before buying any UPS/Inverter.

The next parameter is how the charging is done is it flat charging or it’s done in stages?


In Lead Acid, battery charging has to be fast till 80 percent of the charge but rest 20 percent needs little slow charging because the water is hot inside the battery when we are charging it so we need to follow a pattern by which we reduce the heating when we are charging it so that water doesn’t evaporate and the more we control the heating the life of the battery is increased.

How the temperature affects the battery is very important to understand. External temperature is very important to take into consideration when we are charging the battery. If the temperature is high outside, then the charging required is lesser to completely charge the battery so the cut-off voltage is lower, but when the temperature is higher than the charging takes more time as we need to put in more charge to charge the battery basically this technology completely is called ATC Automatic Temperature Compensation technology which is required by each type of battery to make it healthy and increase the life. In lithium, temperature plays a major role so we need to stop the charging of it crosses the desired temperature

At Su-vastika we have designed a six-stage charger to operate the charging based on the internal and external temperature of the battery.

The charging time and the inverter’s efficiency will define your home’s electricity bill.

Once the inverter/UPS is installed at home, people always complain that their electricity bill has increased.

This is true because when customers choose UPS, they are not given enough knowledge about the product as such.

So we at Su-vastika designed the charger and Inverter technology based on an efficient charging circuit to minimize the bill. So it’s important to check the efficiency of the Charger and Inverter so that the battery size can be reduced if the inverter efficiency is higher.

The concept of trickle charging is also very important to understand as this can increase the electricity bill and can also reduce the battery life if not designed properly by the UPS.


The battery Life is given by the companies as a warranty by the battery companies..

So let us understand the concept of battery life as it depends on the UPS technology to maintain and increase the battery life or reduce it via the charging process.

Low Voltage areas.

There are areas where the voltage comes very low and charging doesn’t happen most of the time, especially in rural areas, because the charger works under the range of specific voltage only like most of the UPS charger works properly from 140 to 270Volts only. We at Su-Vastika designed our charger to work properly even if the voltage goes as low as 100 Volts. This helps properly charge the battery in a specified 10 hours in the case of Lead Acid batteries.

The Inverter part of the UPS system works when the main power goes and it converts Electricity from DC to AC from the battery.

In this scenario, the power quality becomes very important coming out of the UPS at that time. So there are three major portions

  1. Waveform of the Inverter
  2. The voltage and frequency
  3. Switching Time

So let us start with the Waveform when the Mains line goes in the house and the Inverter kick in than people hear the noise in the fans, and people come to know that fans are working on Inverter or UPS as the noise created in the fans is because of the impurity in the waveform. So companies use various types of terminologies like sinosidal. 

A square wave or quasi sine wave etc., but all these waveforms create noise and heat in the appliances and reduces their life of the appliances. The waveform we get from the Electricity department is pure Sinewave, so why do we take a UPS which doesn’t give us Pure Sinewave? We at Su-vastika design our products based on Pure Sine wave only so that you can run any sensitive appliances on our UPS, like TV, Computer Music Systems, etc., with peace of mind.

The voltage required for running the appliances is generally good for appliances is 200 to 230 volts which is ensured by our UPS and the Frequency of 50 Hz only.

The switching time in UPS is very important so that TV and appliances don’t get interrupted when you watch any serial or work on the computer, where the data will be lost. So we at Su-vastika designed our switching time, which is less than 5 milliseconds so that no appliances can see the power cut happening and they work uninterrupted.

Every household experiences voltage and frequency fluctuations in their house. For example when the voltage goes down then we can see the speed of fan goes slow or the light goes dim in the bulbs or sometimes the tube light doesn’t get on if the voltage goes below to a certain level so that condition is called Low Voltage condition.

Also there are times when the voltage goes very high and our sensitive equipment starts getting problems. We all have experienced this condition when some times we get early morning and we switch on the light and it goes out and we realize the bulb got fused because at the time of the early morning, the voltage is generally high because the Load on the grid is minimum. So we define the voltage into three categories

  • Low voltage condition
  • Normal voltage condition
  • High voltage condition

It is to be noted that low as well as high voltage conditions can pose a threat to your appliances.

Therefore, in order to cope with such situations and provide protection to your appliances, our inverter/UPS consists of AVR (automatic voltage regulator). Accordingly, whenever the voltage level rises or drops to an undesirable level, the inverter/UPS automatically switches off the mains and connected appliances are run through the battery to keep them safe all the time for your peace of mind.

II Extra Protection – MCB/Special Resettable fuse.

lithium battery

When we design our UPS than we make sure that we provide you with an extra window for the load. So, for example, our UPS, which can run the 800 VA load we give you the option to connect the 2000VA load approximately so that in case of emergency, you can switch between the loads and also, this feature help you to give extra protection to the connected load so that they can be protected for the low and high voltage protection.

So, for example, your whole house is connected to the UPS and your fans lights and washing machine, fridge etc are connected to the inverter and suddenly high voltage comes and in that case, MCB of your house will not protect those appliances but our feature in UPS will help those appliances to switch to battery mode and in case the load is higher than the UPS will give a warning and stop the output and you can reduce the load and restart the UPS but in this case if the voltage remains high than UPS will not let you operate those appliances, and by switching off those appliances you can keep running essential appliances at that point. This is a big protection for sensitive appliances at your home, so we give you complete insurance with this feature.

The next big protection is the short circuit of any appliances connected through the UPS so they will be protected by the MCB or Special resettable fuse given in the UPS before the MCB of your home trips. So we give you double insurance circuitry.Thus, providing first and extra protection to your appliances.

III. Automatic bypass

solar off grid

Our inverters/UPS are built with the Automatic Bypass feature. Its function has been explained with the help of the following illustration:-

Imagine a situation when mains power supply is available but due to some problem occurring in your UPS and you are not getting any power unless some electrician come and remove or replace the UPS. In these kind of conditions people are very irritated specially when the inverter goes bad and it’s middle of night and the Mains power is available and they can’t call any body at that point of time and have to wait for the morning so that they can call some one for getting the power connected. We at Su-vastika have seen these situations and after doing lot of RND created a feature in which what ever goes wrong with the inverter or power you will get uninterrupted power at your disposal.

To save you this hassle, the automatic bypass feature of our inverter/UPS allows you to simply connect your appliances to the mains power supply with just the push of a button within the inverter/UPS.

E-rickshaw has become an effective mode of transportation in a country like India. Be it a Bus stand, Railway station, Hospital or Market place, e- rickshaw is easily accessible and affordable for regular commutes.

Not only economically, but it is also a green ride far-far better than conventional modes of transportation. It has also become a good source of earning for some people in society.

According to e-rickshaw owners, battery-related problems, maintenance & replacement makes it a bit expensive. Otherwise, it’s an ideal source of earning for them.

Battery Management System

Major Challenges of E-rickshaw owners

Not only battery replacement cost but how e-rickshaw is being driven, how a battery is charged and how is the quality of the battery are also challenges that e-rickshaw owners are facing.

Let’s understand it with an example….in a normal day, an e-rickshaw driver wants to ride it for at least 10 hours so that he can earn Rs. 400 to 500 after paying the rent. But practically, he does not run it for complete 10 hours; there will be some waiting time when he waits for passengers. People don’t know, but a waiting e-rickshaw harms the battery. These waiting and uneven stoppages create different size lead acid in battery plates, which means that in 10 hours, there will be 10 different size lead sulfate crystal in his battery, and to charge these, he needs 10 different charge factors….

Normally we give one input during charging which overcharges the bottom and under charge the top lead sulfate of the charge factor. In short, such driving patterns create overcharge and undercharge problems in the lead sulfate of the battery, and going forward; it results in poor battery performance and faults in the battery.

The reality is that a huge share of his earnings goes into battery maintenance and replacement.

What is the solution?

Battery Management System (BMS) is a unique product that equalizes two or more batteries in a battery bank connected in series, thereby eradicating imbalance in the form of unequal voltage.

 battery bank

The way wheel balancing enhances the life of car tires, the battery management system enhances the battery life by preventing under-charge and overcharge of the batteries. Battery equalizer helps you save money by delaying the replacement of the batteries, as you get optimum life from the batteries.

Benefit of Battery Management System (BMS)

-Enhances Battery Life up-to 50%

-Saves on Electricity

-Saves Money

-Works with multiple batteries (2 or more)

-Saves from over & under charging

-Increases battery life

-Reduces battery replacement chance.

Features of Battery Management System (BMS)

  • Built on Microcontroller based AET technology (Active Equalization Technique)
  • Reduces the frequency of battery water topping, which saves maintenance cost.
  • LCD display Multimeter for easy viewing of equalized voltage of batteries.
  • Easy to install
  • Suitable for new & old systems.


As mentioned, it is a helpful device for equalizing multiple batteries.

equalizing multiple batteries
  • A vehicle with 2 or more batteries like truck, bus, e-rickshaw
  • Petrol pump
  • ATM
  • IT Centres
  • Office backup etc. 

On-grid Inverter

On-grid or grid-tie solar inverters are by far the most common and widely used by for homes and commercial purpose. These inverters do not require batteries and use solar inverters and are connected to the electricity grid. Whatever excess solar power is generated is exported to the electricity grid and owner get paid a feed-in-tariff (FiT) or credits for the energy you export.

But there is a challenge, On-grid solar inverters or Grid Tied Inverters are unable to work or generate electricity during a blackout due to safety reasons. Since blackouts usually occur when the power grid is malfunctions; If the solar inverter was still feeding electricity into a damaged grid it would risk the safety of the people repairing the fault/s in the network. It also stops working during voltage fluctuation. In both the cases there will be wastage of Solar Energy.

Off-grid Inverter

Off-grid inverters are not connected to the power grid that is why they require batteries for power storage. Off-grid solar systems must be designed such a way that they generate enough power throughout the year and have enough battery capacity to meet the home’s requirements, even in winters and monsoon when there is less sunlight.

High cost of batteries and off-grid inverters means off-grid systems are much more expensive compare to on-grid systems and so are usually only needed in places which are in remote areas and are far from power grid like vacation homes, resorts, farm houses etc.

What is Hybrid Solar System?

A hybrid solar system has best of both On grid and off grid.  It combine solar and battery storage in one and are now available in many different sizes and configurations. Due to the decreasing cost of battery storage, systems that are already connected to the power grid can start taking advantage of battery storage as well. This means storing solar energy which is generated during the day and it at night. When the stored energy is less, the grid is there as a back-up, allowing consumers to have the best of both worlds.

Hybrid Solar Inverter allow full control over your power, while keeping you grid-connected in case of emergency.  Hybrid Solar systems generate power similar to a normal grid-tie solar system but use special hybrid inverters and batteries to store power for later use. This quality to store energy enables most hybrid systems to also operate as a backup power supply during a power outage like UPS.

If there is a power failure or the grid becomes unstable the unit will automatically switch over to battery supply immediately and continue to operate independently from the electricity grid.

Why to store solar energy in a battery?

Many governments and network operators have reduced the solar feed-in tariff or FiT. This means traditional grid tied systems have become less attractive as most people are working during the day and not at home to use the solar energy as it is generated, thus the energy is fed into the grid for very little return.

solar hybrid system stores your excess solar energy and can also provide back-up power during a power outage. This is perfect for domestic use, farm houses, resorts, vacation homes etc.

Hybrid Solar Systems enable you to store solar energy and use it when you face an electricity cut.

The ability to store and use your solar energy when desired is referred to as self-use or self-consumption. It works in the same way as an off-grid power system but the battery capacity required is far less, usually just enough to cover peak consumption (8 hours or less) as opposed to 3-5 days with a typical off-grid system.

Key benefits of hybrid systems

Hybrid inverters have many advantages – here are some of the top ones to consider:


A common misbelief about solar is that if you install a Grid Tied inverter, you’ll always have power during outages. In most cases, this is not true. Traditional GTI systems automatically shut off during power failure for safety purposes, cutting off power generation from your solar panel system.

If you want to keep your home or commercial establishment running on backup solar power during a grid failure, hybrid solar system paired with batteries are perfect solution. Some hybrid inverters have both on-grid and off-grid capabilities, allowing you to continue running on solar power even if the grid fail.

Easy Monitoring

With a hybrid solar inverter, all of your solar electricity–whether being sent to the grid, self-consumed on your property, or being stored in your battery–is converted through one component. This allows for “centralized monitoring,” which means you can monitor both your solar panel system and battery performance through one platform.

Easier installation process

One of the biggest benefits of a hybrid solar inverter is that it combines the functionality of two separate pieces of equipment into one. This mean an easier installation process for your solar installer. Depending on the prices of the individual components and the labour cost, you may save money by installing a hybrid inverter from the get-go as opposed to paying for both a solar inverter and a battery-specific inverter separately.

Future-ready (Add- on is possible)

A hybrid system is possibly the most expandable, future-ready home solar setup. With some customisable hybrid systems, you can expand capacity by buying more panels or batteries. Hybrid systems may also be compatible with newer solar technologies — for example, an electric vehicle (EV) might function as one of the ‘batteries’ in a hybrid setup.

Latest Technology

While Off Grid is an obsolete technology, Hybrid Solar System is latest, cost effective and more useful.

Have you experienced a power outage when you were in a moving lift/elevator that stopped with a sudden jerk at society or hospital or business house or listened about it?  What panic you observed there. I was trapped once in the cabin of our society’s lift with my little daughter. She was very terrified when the lift stopped suddenly with darkness between the two floors. And the situation can become worse in the closed lift if there are pregnant women, children, senior citizens, and patients with high blood pressure, heart disease, etc.

But there is a fullproof solution to this horrifying situation and claustrophobia of people if lifts/elevators are attached with Emergency Rescue Device (ERD). An Emergency Rescue Device (ERD) is an electronic and electrical apparatus that provides emergency power back up to the lift or elevators with almost zero switching time when the input power source or mains power supply fails suddenly. The power supply outage can be due to a fault, shortage of power, Natural Disaster, or Fire.

ERD, ARD & Generator As Lift Power Backup

An Emergency Rescue Device (ERD) differs from an auxiliary or any other power backup system like Generator and Automatic Rescue Device (ARD). No Generator or existing ARD system available in the market can provide smooth operation of elevators like an ERD during a critical period of a power failure, fire, or earthquake.

Generator as Power Backup for Lift 

There are two types of generator sets, Automatic Genset & Manual Genset, attached with the Control Panel that supply current to the motor for the movement of Lift/Elevator upward and downward. If the power supply fails due to any reason like power shortage, Fire, or Natural disaster, the Automatic Genset takes 45 Sec to 1 minute to provide power to the lift. Whereas in the same situation, Manual Genset takes 2 to 5 minutes to restore the power supply. Here we can think of a horrible and terrifying situation if there are Children, Pregnant women, Sr. Citizens, or critical patients on the 11th Floor and the lift stops suddenly with a waiting time of 45 Sec to 5 Minutes to resume power by Generator.

Automatic Rescue Device (ARD) as Power Backup for Lift

An Automatic Rescue Device (ARD)is a device used to stop the lift first when the main power supply is cut suddenly and rechecks all the circuits to confirm if everything is okay. This process takes at least 45 Sec and then it moves the lift to the next lower or upper floor with a lot of jerks and turbulence. It causes different problems to heart patients and pregnant women can have long terms issues in that state. It also damages the electronic mechanism of the device and becomes one of the major causes of the lift’s costly maintenance.

What is Emergency Rescue Device (ERD) & how it differs from ARD and DG? 

An Emergency Rescue Device (ERD) is an electronic and electrical apparatus based on future technology developed by collective efforts of qualified and experienced electronic, electrical, and computer hardware & software engineers. An ERD provides emergency power to the lifts/elevators with a 3-phase power supply, when the mains power fails. It differs from any other emergency power system, like a generator or ARD, because it provides near-instantaneous protection from input power cut by supplying electric current stored in batteries with zero switching time.

The technology used in the development of ERD is different from inverter technology. The ERD technology is specially designed for lift loads only.  It takes care of the regenerative load and the switching time is almost zero. As a result, the lift/ elevator does not come to know of the switching from one load to another.

What are the features of the Emergency Rescue Device (ERD)?

In a nutshell, the ERD has different features like a lift emergency power backup, for examples:

  • It provides smooth running if the power supply goes off suddenly.
  • It gets off at any floor without any sudden jerk.
  • There is no fear and claustrophobia in the mind of lift users inside the cabin.
  • There is a panel inside the lift to show the status of power and its back up.
  • There is no chance of damage of elevators for the sudden stop or excess current at the start. And finally
  • It provides complete peace of mind to lift’s users whether they use it in high-rise apartments or hospitals, or business offices.

What are the key benefits of ERD? 

There are various benefits of ERD if it is attached to a control panel which supplies current to the electric motor to move the lift up or down:

1. ERD Protects Lift Users Life

When people are stuck in closed lifts/elevators due to sudden power outage, it creates a fear psychosis through claustrophobia and they feel choked despite proper ventilation in the lift. According to the American Journal of Psychology, this can aggravate serious and life-threatening situations for the lifts’ occupants, especially kids, pregnant women, elders, disabled, and serious patients.  This small time-lapse of 30 to 45 seconds can lead to panic and horrible situations like fainting of occupants to such a situation that can trigger cardiac arrest.

2. ERD Prevents Apparatus Damages

The switching time of most Diesel Generators to supply backup current to lift control panel is relatively sluggish from 90 seconds to 5 minutes or more that causes lift electronic parts damages. But in the case of ERD, the switching time is almost zero that prevents damage to the lift’s electronic mechanisms in the long run.

3. ERD Saves Lift’s Users from Disaster

An ERD provides an uninterruptible electronically controlled software program-based power supply to the lifts in all scenarios. It includes natural disasters like Fire, Earthquake, and Grid Failure, especially for high risers in urban areas. For example, in case of fire main power supply is cut and survivors on the upper floors can come down with the help of the ERD power supply and saving them from any untoward happenings.

4. ERD will be the only power backup in future  (Add-on Point)

ERD will become the only option for power backup because generators emit particulate matter containing burnt hydrocarbons and nitrogen oxides (NO2). These hydrocarbons and NOadd to air pollution. If the generator is in bad condition, it can also emit unburnt hydrocarbons, which are even worse for the environment. They also produce noise. So generators are getting banned in most of the cities in future as pollution is a big challenge for the future generations. Moreover, ERD can give as much power back up as required by the generator without any rest.

Thus ERD-enabled lifts eliminate the most horrible situation while providing disaster resilience to the buildings, users, and operators. And it saves the lives of lift users in an economical and environment-friendly manner that no generator or existing ARD system can provide.

Advantages of ERD in Brief 

  • ERD is environment friendly as it does not produce air pollution, noise pollution, or vibration and it can be solar-powered.
  • ERD is developed and based on Disaster Response Management System. It maintains Fire Safety norms for the lifts and protects against Lift accidents due to power failure and earthquake.
  • ERD is cost-effective in the market if compared with the size and load of UPS’s cost. It has less running cost of electricity and longer life of its Batteries.
  • It can provide the backup time to run the lifts from 10 cycles of lift operations to 2,000 cycles depending on the load capacity of ERD attached to the control panel. And the one cycle counts for the complete one operation of the lifts from ground to top floor and top floor to ground floor.
  • Lithium batteries can also be used in ERD for saving space and maintaining the longevity of battery life and reduction of the battery’s weight.
  • The ERD is technologically designed to put on solar charge controller externally for saving the electricity cost and providing complete green solution prescribed by the green building norms.
  • Thus, ERD is the “All in One” Power Backup Solution for Lifts and Elevators that works with minimal human intervention and saves lives, apparatus, lifts, cost, and environment.