Frequently Asked Questions

Generic

Whether you should install rooftop solar or not depends upon a lot of factors, none more so than whether you have a free rooftop with enough space and shadow-free area. Post that it depends on what kind of electricity bills you are generating and what kind of power backup you have. In short this can be a little daunting. This is where Luminous has as come up with a really interesting tool the “SolarizerTM”. It is a solar calculator which requires very simple inputs and helps you know your solarisation potential. Using the more advanced version, you can further design the system and also personalise it. Should you need more assistance ask for a call-back or request a site survey.

Installing a rooftop solar PV system is any day a wise choice. It will help you to reduce your monthly electricity bill. But going completely off power from the grid might not be the best thing to do.

Why? If you completely cut-off from grid, then you will be needing batteries for storing the light energy that is converted into electricity. This energy then shall be re-converted for use and it is here that efficiencies of conversion come into play. Also batteries increase cost as they need to be replaced every 4-5 years and require maintenance.

A grid-tied solution with net- metering is perhaps a better choice. You can enjoy all electricity generated by panel during day time and during night time, you can take power from grid.

The math therefore is simple. A system with storage or an off-grid system requires a higher outlay of money owing to the batteries. For complete autonomy an even higher one!

Whereas, with a Grid-tied or an On-grid system you have a choice of power sources your own Solar Power Generation System or the Grid. If you consume more than you generate, you pay for the excess units. On other hand, if you generate more than you “consume” then you get paid for the excess units.

An On-grid solar power generation system with 5 kW capacity would typically cost between Rs. 70/watt to Rs. 80/watt depending on the brands you choose, the balance of system inclusions and the quality of workmanship. Let’s say you consume 1,000 units monthly and your 5 kW system generates about 650 units per month, then your bill will be 350 units only. The Return on Investment is in around 4.5 years. Then you earn for a minimum of 20 years.


Choose an On-Grid solar power system. These systems are designed to work in conjunction with the grid or simply put your electricity supply. The electricity you generate using this system is fed back to the grid. A net meter is installed along with this system to keep track of the electricity consumed by you versus what you generated and fed back to the grid resulting in savings which gets reflected in the bill. But keep in mind that it does not work when the grid is down, so if power back up is your objective, go for an off-grid solar solution.


Go for Off-grid solar power systems. These systems store the electricity produced by conversion in batteries and utilise the stored energy by converting it back to AC so that you can keep running you appliances during power cuts. It’s a boon if you are living or planning to live in an area with no mains connectivity. The rising cost of other power sources as well as of and the increasing demand of electricity, especially in high power cut or no grid areas, has resulted in increased demand for such systems. The reduction in battery prices over the years has further brought the system cost down. But if you don’t have a power cut issue, then we suggest you go for an on-grid system as it will help you save big on your electricity bill.

A solar panel comprise of multiple PV (photo voltaic) cells that convert sunshine to electricity. Two types of PV Panels are there – while one comprise of “Polycrystalline Cells”, the other one contains “Monocrystalline Cells”. Polycrystalline cells are effectively a slice cut from a block of silicon, consisting of a large number of crystals. They have a speckled reflective appearance and are very thick. They are less expensive to produce and more suited for Indian conditions. Monocrystalline cells are much thinner and have a smoother feel to them. They are costlier to produce as compared to its polycrystalline counterpart. Based on the area available for solar installation, the required capacity of solar panels can be calculated. Call our solar expert to know your solar potential and get your solar journey started.

There are broadly two types of rooftop systems that you will hear about -On-Grid solar power system – These systems are designed to work in conjunction with the grid or simply put your electricity supply. The electricity you generate using this system is fed back to the grid. A net meter is installed along with this system to keep track of the electricity consumed by you versus what you generated and fed back to the grid resulting in savings which gets reflected in the bill. It does not work when the grid is down. Off-grid solar power system – These systems store the electricity produced by conversion in batteries and utilise the stored energy by converting it back to AC as and when required. The rising cost of other power sources and the increasing demand of electricity, especially in high power cut or no grid areas, has resulted in increased demand for such systems. The reduction in battery prices over the years has further brought the system cost down.

The most crucial component of a residential solar power plant is an inverter. It acts as an interface which converts power produced by solar panels into electricity which can be consumed to appliances. The type of inverter being used depends on the kind of solar power system you are going for. Grid tie solar power systems need high efficiency power inverters for optimising the performance. Another kind of high efficiency solar inverters are there for the off grid solar power system that can charge batteries both from solar and grid power. The inbuilt MPPT (Maximum Power Point Tracking) charge controllers in some good quality inverters extract up to 30% more power from solar panels.

Worried about solar panels warranty? Don’t worry, as the panel’s come loaded with 25 years of performance warranty!

A solar rooftop power system will deliver the full return on investment only if runs as smoothly as possible. This means periodic inspections of the individual components of the system. A timely intervention can prevent the threat of diminished output or downtime or a safety hazard. This why it’s important to get in touch with a reputed brand to install your solar system so that all this can be taken care off. Click here to find out how.

No, it even works when it’s cloudy! Obviously the power generation will not be optimal but it does not stop working. Also, with 300 sunny days, India is blessed to be the best destination for solar power generation.

Installing a rooftop solar PV system is any day a wise choice. It will help you to reduce your monthly electricity bill. But going completely off power from the grid might not be the best thing to do. Why? If you completely cut-off from grid, then you will be needing batteries for storing the light energy that is converted into electricity. This energy then shall be re-converted for use and it is here that efficiencies of conversion come into play. Also batteries increase cost as they need to be replaced every 4-5 years and require maintenance. A grid-tied solution with net- metering is perhaps a better choice. You can enjoy all electricity generated by panel during day time and during night time, you can take power from grid. The math therefore is simple. A system with storage or an off-grid system requires a higher outlay of money owing to the batteries. For complete autonomy an even higher one!Whereas, with a Grid-tied or an On-grid system you have a choice of power sources your own Solar Power Generation System or the Grid. If you consume more than you generate, you pay for the excess units. On other hand, if you generate more than you consume then you get paid for the excess units.

Product Specific

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.

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, get installed only by a trained technician.

PV systems are currently considered to have at least a 25 years lifespan. PV modules are covered with a long term performance guarantee (usually 10 years with less than 10% decrease and 20 years with less than 20%) by all the most important manufacturers. Guarantees for electronic components such as UPS can also be extended for several years beyond standard terms.

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 connected in parallel. 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.

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, get installed only by a trained technician from a good company. Click Here to find out more.

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.

As there are certain specifications you should use when evaluating your solar battery options, such as how long the solar battery will last or how much power it can provide. Below, learn about all of the criteria that you should use to compare your home energy storage options, as well as the different types of solar batteries.

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