Save Energy, Save Money & Save Planet India. Get Smart Switch to Solar - Luminous India Save Energy, Save Money & Save Planet India. Get Smart Switch to Solar - Luminous India
FAQ's

UPS

The UPS converts the DC electricity into AC electricity. In Luminous Hybrid UPS Solar energy is utilized to the maximum , ensuring reduction in electricity bills.
Output AC from a Pure sine wave UPS is just as good as Mains Power from an Utility supply. Hence, it is safe for expensive appliances like Laptops, PC etc. A square wave UPS produces modified Sine wave AC out put, and hence used mainly for CFL lighting etc. applications.
This refers to the input voltage from the battery bank. When you decide on a system voltage of UPS, the Solar Panels and Battery Bank need to use the same voltage rating.
It depends on the load & duration you want to run using UPS. For typical combinations refer to load chart.
Yes. Solar panels produce less electricity under cloudy conditions. However in such case our hybrid UPS uses mains power to work efficiently.
Both watts (W) and volt-amperes (VA) are units of measurement for electrical power. Watts refer to “real power,” while volt-amperes refer to “apparent power. ” W=“power factor”*VA(volt ampere)
Batteries should be connected as per the UPS specifications. If a UPS is a 12V system then battery and panel connection should be such that it should have output of 12V. You can connect batteries in parallel, but not exceeding the recommended Ah specification of UPS.
Our 850VA solar UPS has 30Amp/12V charge controller and 1500VA solar UPS has 40Amp/ 24V charge controller.
Laser printers require high surge current while switching on the laser engine. This can damage the battery and also can result in very low back up time.
This feature is to control charging of battery from Grid. Please refer technical specification for further details.
When selected Eco Mode battery charging commences from 100V and even in high voltage fluctuations. UPS mode is for areas where sensitive equipment like Pcs, Laptops etc. run and there is no voltage fluctuations.

Lantern

Our Solar lantern has inbuilt battery which comes disconnected to prevent battery from deep discharge. So at the time of purchasing one has to connect terminals of the battery and charge it for full one day before using it.
The LED light can be of different color and intensity including super bright white LED which is used by Luminous solar Lantern. Super bright white LED lights are of sufficient intensity for both reading and illumination purpose and completely UV free for safe use.
The average life of LED bulb is 100000 hours which is almost equal to 23 years (considering 12 hour daily use). The LED virtually does not require any replacement.
No. You have to keep panel under the sun which comes with 6mts wire.
Warranty of your solar lantern is of 1 Year and for battery its 6 Months from the date of purchase.

MPPT Charge Controllers

MPPT is short for Maximum Power Point Tracking. MPPT is an electronic system that operates the modules in a manner that can extract more PV power and deliver higher charge current than conventional PWM charge controllers. Under optimal conditions Solar Boost MPPT charge controllers can increase charge current up 30% or more. The 4-stage MPPT controllers haveadvantage function call equalization.
Equalization does somewhat what the name implies - it attempts to equalize - or make all cells in the battery or battery bank of exactly equal charge. Essentially it is a period of overcharge, usually in the 15 - 15.5 volt range. If you have some cells in the string lower than others, it will bring them all up to full capacity. In flooded batteries, it also serves the important function of stirring up the liquid in the batteries by causing gas bubbles.
The only way to get full power out of high voltage grid tie solar panels is to use an MPPT controller. Since most MPPT controls can take up to 150 volts DC (some can go higher, up to 600 VDC) on the solar panel input side, you can often series two or more of the high voltage panels to reduce wire losses,or to use smaller wire. For example, with the 175 watt panel mentioned above, 2 of them in series would give you 66 volts at 7.6 amps into the MPPT controller, but the controller would convert that down to about 29 amps at 12 volts.
Standard charge controllers, will often work with high voltage panels if the maximum input voltage of the charge controller is not exceeded. However, you will lose a lot of power - from 20 to 60% of what your panel is rated at. Charge controls take the output of the panels and feed current to the battery until the battery is fully charged, usually around 13.6 to 14.4 volts. A panel can only put out so many amps, so while the voltage is reduced from say, 33 volts to 13.6 volts, the amps from the panel cannot go higher than the rated amps - so with a 175 watt panel rated at 23 volts/7.6 amps, you will only get 7.6 amps @ 12 volts or so into the battery. Ohms Law tells us that watts is volts x amps, so your 175 watt panel will only put about 90 watts into the battery.

Solar PCUs

Efficiency of 90% and above are achievable in a High frequency SMPS based UPS. Where as transformer based design can achieve about 70% efficiency. To get higher efficiency, the transformer has to be over designed making it costly.
Efficiency is the figure of merit of the UPS. It indicates the percentage of power delivered at the output from the input power drawn from the DC Battery. This power loss is wasted inside the UPS as heat. If you notice large heat-sink or more number of cooling fan or if the temperature of the air thrown out by the cooling fan is high then efficiency is poor. This power wasted is every day and is direct loss in terms of money.
The electricity bill you save is proportional to the capacity of the solar panel installed. In tropical country like India, we can expect average 4-5 hours of good sunlight for about 300 days in a year. A 1000Wp panel, will generate about 4-5 units per day on a sunny day.
It depends on the extent of power you want to generate. Make a list of the total load and the time it will be ON in a day. Multiply individual load by the time it operates in a day to get the energy consumption (Watt-Hour) per day. Divide this figure total by 4 (Sun hours). This figure gives the approximate total panel Watts.
The PCU supports mono or poly-crystalline panels. For 12V battery system, 36 cell panels with VOC about 21V should be used. Usually 36 cell panels are below 140Wp. Hence for higher capacity, many panels should be parallel connected. In the case of 24V battery system, 60 or 72 cell panels can be connected. These have VOC about 36V and 42V respectively. It is allowed to connect two 36 cell panels in series to make it suitable for 24V system. You should not connect 60 or 72 cell panel to a 12V battery system.
The SOLAR mode is the power generation mode. This mode is to be selected in places where Grid power is stable and available. The objective is to reduce the dependence on Grid power. When the day starts, the PCU first charges the battery. Once the battery has charged, it then disconnects the load from Grid and connects to the UPS. Simultaneously, the solar panel will be charging the battery and so the load runs on Solar power. In the evening when the Sun sets, the UPS continues to supply the load from the battery. This continues till the battery reach reserve level after which the load returns back to grid supply. It continues in grid till next day morning and then the solar charging takes over. Grid charging will happen only if the battery has gone below reserve.
In a PCU, the load is automatically changed to UPS and Grid depending on its operation. Hence if excess load is installed in grid mode, then when it goes to UPS, it may trip in overload. It is recommended that only the loads that normally runs in the UPS mode only is connected to the system.
The PCU has a fully automated & complex charging algorithm using Constant Current-Constant Voltage (CC-CV) method. Since in the solar mode frequent charge-discharge happens, to ensure good health of the battery automatic equalize charging is done every 30 days. Hence no external charging is required.
Installation by a trained technician is very important. There are many details like the quality of input & output wiring, reverse supply of ac voltage on the output, proper safety Earth, polarity of wiring, routing and casing of the PV cable etc. which has to be done as per standards. Ease of maintenance in case of a breakdown is also an important consideration. Good installation ensures trouble free and long life. Hence install only by a trained technician.

Solar PV Modules

Today's PV systems integrate easily with your home's existing electrical system. They produce clean energy no air pollution, no greenhouse gas emissions. And they can greatly reduce, or even eliminate, your electricity bills. A well designed and installed PV system is often considered a beneficial feature on a house and can increase the value of your property.
We use both Poly & mono crystalline solar cells. Polycrystalline is less pure than mono crystalline and has lower heat tolerance, but is cheaper. If you’re installing solar over a large area and spending tens of thousands of dollars, it may be a better option to save with polycrystalline solar panels. Thin-Film is the least efficient, usually around 10%, and degrade the fastest, but is the cheapest option, and useful for certain applications where weight and flexibility are critical issues.
A PV system needs daylight to work, not direct sunlight. The electrical output of a PV cell is dependent on the intensity of the light to which it is exposed. Therefore it is certain that a module exposed faced to the sun of midday and by clear sky, will produce its maximum of output electricity (Watt peak = maximum power). Nevertheless, photovoltaic do not need to be in direct sunlight to work, so even on overcast days a PV cell will be generating some electricity. In practice, if a module can produce a maximum of 170 Wp (170 Watt peak) exposed to the sun, it will produce some between 130 and 150 in cloudy weather.
It depends on several conditions. Orientation of the system (south), system inclination (what is the inclination of the roof), irradiance value at the location and last but not least, the weather. The following value can be assumed as a rough planning aid: 800-900 kWh per year for each kWp of installed power.
Yes. Solar cells today have an efficiency of 15%, which is continually increasing. That does not sound much, but is actually quite a lot, as this already corresponds to 50% of the physically possible efficiency.
There are no limits for installing PV systems when a good exposure is achievable. Beyond roofs, some of the most common places used to implement PV systems are, for example: - facades, which offer huge possibilities for architectural integration and visibility; - sunshades; - canopies; - greenhouses; - noise mitigation barriers; - of course, the ground, especially for large scale applications.
Certain shifts with respect to the optimum installation requirements for photovoltaic are allowed, without substantial efficiency loss. But it is advisable to install PV modules facing south for complete solar incidence

Solar PV Modules

No, solar home lighting systems are not UPS systems because it uses DC current from the battery to run Lamps/Fans/TV. All are DC appliances not AC appliances.
Solar lighting system can be used anywhere where we need lighting. It is a source of clean energy and can be used at home, offices, hotels, hospitals, rural areas, remote villages etc
Our Product is LED based with high efficiency. It consumes 70 - 80 % less energy than ordinary incandescent bulbs. The light output of one lamp is equivalent to 14W CFL.
Solar home lighting system generates electricity in cloudy weather but output is reduced so it uses mains for charging to full fill the requirement because our product can be charged from both solar & mains(priority to solar). Hence, our solar home lighting system works almost throughout the year.
There are various advantages of solar Home Lamp System;

There is no need to depend on conventional electric supply or other fuel like Kerosene, Gas.
Electricity generated by using sunlight is free & available anywhere.
Solar home lighting system works on low voltage12 VDC, so it is much safer compare to 230V Ac supply voltage.
Very easy to install & operate.

Charge Controller

A solar charge controller, is basically a voltage and/or current regulator to keep batteries from overcharging. It regulates the voltage and current coming from the solar panels going to the battery.
PWM stands for Pulse Width Modulation. PWM is often used as one method of float charging. Instead of a steady output from the controller, it sends out a series of short charging pulses to the battery - a very rapid "on-off" switch. The controller constantly checks the state of the battery to determine how fast to send pulses, and how long (wide) the pulses will be.
The low voltage disconnect charge controller is used to manage power at sites that are configured with one or more solar panels. The LVD should disconnect the load when the battery drops to around 11.5 volts. The load should be reconnected when the battery voltage goes above 13.0 volts.
Not necessary. But its always advisable to follow below mentioned order:

Cover the solar panel with an opaque cloth or turn it glass down, so that it cannot see any sunlight
Attach the batteries
Attach the panel
Attach the load
Uncover the solar panel so that it sees sunlight
As long as the maximum input voltage of the charge controller is not exceeded. You can always go up to 24V panels for your charge controllers.

Solar Cracker

Because it runs AC loads up to 45Watt and with Single 15 Watt CFL it gives backup of 5Hrs.
No it does not come with inbuilt battery but it has provision to connect 7Ah to 7.5Ah 12 volt battery. This is done to prevent battery discharge.
Yes you can charge you mobile phones with it by using your normal mobile charging adaptor in one of the sockets provided.
Yes you can charge it from solar and mains both simultaneously . More priority will be given to solar.
The recommended panels rating is of 20Watt/12V(Refer to technical specifications). Spare Pins to connect panel with solar cracker will be provided within the pack.
Yes one has to buy panel separately for charging through solar.
It requires one full day charge to get the battery fully charged.
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