About Helical Power

Helical Power is a renewable energy consulting company providing technical and financial pre-feasibility analysis of Rooftop and Solar PV Farms. We also provide EPC and financial services by facilitating collaboration with our international EPC and finance partners.
Helical Power is active in 3 main areas of business, viz. Solar Pre-feasibility Reports, EPC Contracting, Renewable Project Financing
HeliCAL is an instant Solar power pre-feasibility report which provides Solar energy assessment, system sizing, as well as 25 years worth of financial analysis which includes Internal Rate of Return, Net Present Value, Cash Flow analysis, DSCR Ratio, Payback period, etc. for your Rooftop solar power system or Solar PV project. There are two types of HeliCAL reports; Basic and Premium which cater to various categories of users like homeowners, industrial and commercial users, PV farm owners, Solar consultants, banks, investors, etc.
The Basic report covers aspects such as Resource data, PV generation, losses, etc. The basic report can help in site assessment as well as will help you compare various PV technologies. The Basic report provides data such as Global Horizontal Irradiation, Global In-Plane irradiation, PV Electricity production, Performance ratio, System Losses, etc.
The Premium report covers all of the Basic plus it also covers system sizing as well as financial aspects which helps you understand your system size as well as the economic viability of you solar PV system. The Premium report covers resource data, system size, PV generation, system losses, System cost, Internal Rate of Return (IRR), Net Present Value (NPV), Cash flow analysis, tariff determination, payback period, etc.
The resource data is obtained from SolarGIS which is a well-known global brand and has one of the most accurate database.. Please refer to 'How It Works' page
Please follow the below simple steps:
  1. Sign In (or you can checkout as a guest)
  2. Go to HeliCAL Report page and Select Basic Report
  3. Enter Location details & the type of user you are (Enter your address/ site co-ordinates/select ‘My Location’ if you are present at the site)
  4. Enter PV System details (or use our deafukt values)
  5. Make payment on our secure payment gateway
  6. Your Basic Report will be emailed to you shortly
Please follow the below simple steps:
  1. Sign In (or you can checkout as a guest)
  2. Go to HeliCAL Report page and Select Premium Report
  3. Enter Location details & the type of user you are (Enter your address/ site co-ordinates/select ‘My Location’ if you are present at the site)
  4. Enter PV System details (or use our deafult values)
  5. Enter financial parameters or use the default values
  6. Make payment on our secure payment gateway
  7. Your Premium Report will be emailed to you shortly
The HeliCAL report is for anyone who is planning on investing a Solar system/plant either. Users may have various reasons to invest in Solar some of which may be to have access to electricity, to save money by benefitting from feed-in tariffs, saving in tax credits, earning green points and in many other ways. The long list of users could range from Homeowners, Industrial users, commercial users, hotels, banks, financial institutions, investors, Solar PV farm owners, Utilities,, EPC companies, etc.
The HeliCAL report comprises of three parts, resource assessment, system sizing and Financials. The Climate data and system sizing is for all countries of the world. While the default parameters set for financial analysis are primarily for the Indian market but users have the option to enter their own parameters.
Indian Users (INR) International Users (USD)
Basic Report 500 20
Premium Report 1000 30
Logo 100 5
Helical Power sources its data from SolarGIS database
SolarGIS energy system platform is developed by GeoModel Solar and offers access to historic, recent and forecast radiation and PV energy output data for almost any location on earth. The SolarGIS database has been independently identified as the most reliable irradiation database on multiple occasions.
Quality of SolarGIS data is determined by underlying models, spatial and temporal resolution of atmospheric and meteorological inputs, and their accuracy. SolarGIS has been validated at 180+ locations, where high quality measurements were available. Statistics such as bias and RMSD are used for estimation of user‘s uncertainty. SolarGIS model demonstrates stable performance globally, and uncertainty lies within the margins described below.

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Yes, Helical Power services can be accessed via smartphones.
Helical Power reserves the right for cancellation or refund of fees. Users should note that once an order has processed it cannot be cancelled and a refund cannot be issued. However in the unlikely event of an error on our part the users should point this to us by writing to us at info@helicalpower.com and we will try our best to get it resolved.
You can have your password reset and emailed to you. If you have tried this and still need help, you can submit a request to have your password reset by filling the form on Contact Us page
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Since your email address is used as the login for your Helical Power account, we do not currently allow you to change your email address. If you do need to change your email address, please contact us or fill up the form on the Contact us page.
After logging into your account, the status of your checkout history can be found under Order History.
Multiple locations / configurations cannot be ordered in one report. As of now one individual location is treated as one order which needs to be completed by making the payment. If you woud like data for another location or compare energy output of different types of modules or financial analysis using different parameters then each configuration will be treated as a separate order.
Users may order different configurations of the system or financials for the same location. However each different configuration shall be treated as a separate order.
Ideally you should have your report emailed to you in less than 5 minutes but sometimes due to server issues it might take longer
Go to heliCAL report page, select the tick box besides logo and upload your logo (ideal size is 200px * 100px)
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There can be several reasons why Credit or Debit Cards are declined. Some common reasons include Insufficient funds or daily payment limits for your card, Limited authorisation for payments outside your country or region. You may want to contact your bank to make sure that the above mentioned reasons do not apply to your card. In case payment by credit card is not successful despite multiple attempts, you can still complete your order by selecting an alternate payment method.
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Battery Voltage - 12V, System Voltage - 24, Battery loss - 0.85 , Depth of discharge of Battery - 0.6, System losses - 1.5


"Electricity is the movement of electrons through a conductor, like a wire. The difference between AC and DC lies in the direction in which the electrons flow. In DC, the electrons flow steadily in a single direction (forward) whereas in AC, electrons keep switching directions (forward or backward). Eg: A laptop uses both kinds of current. The plug that goes in it delivers a direct current to the laptop’s battery, but it receives that charge from an AC plug that goes into the wall. The power adapter which is in between the wall plug and the laptop is that transforms AC to DC. (Source - MIT.edu)
A Grid connected system is an electricity generating solar PV system that is connected to the electricity grid
Off Grid system is a stand-alone power system which can provide electrcity to an independent home or community without being connected to an electricity grid.
A Solar PV module (Solar panel) is an assembly of photovoltaic (PV) cells. To achieve a desired voltage and current, a group of PV modules (or PV panels) are wired into large array called PV array
Some of the types of Photovoltaic modules are Crystalline Silicon, Amorphous or Thin Film Silicon, Cadmium Telluride & Copper Indium Selenide.
An inverter is an electronic device that converts direct current (DC) to alternating current (AC)
A Solar Inverter is a device which converts direct current (DC) power output from the solar arrays into AC electricity for AC appliances that can be fed into a commercial electrical grid or used by a local, off-grid electrical network.
The most important thing to consider while sizing an inverter is the total load connected, i.e the wattage of all appiances connected. For calculations, a buffer of 30% more than the total watts of the appliances has been considered. However in case the appliance is a motor or compressor then the Inverter size is recommended to be atleast 3 times the capacity of those appliances and should be added to the Inverter capacity to handle surge current during starting. Starting and running power requirement of all electric appliances are different. Eg: An 18 Watts CFL takes around 25 Watts power to start and after few seconds it stabilizes to 18 Watts. Some appliances like Refrigerator, Washing Machine etc take almost double power to start as compared to the normal running power. Hence before selecting an inverter we advise calculating the starting power requirement also.
Inverter efficiency can be defined as what percentage of the power that goes into the inverter comes out as usable AC current
The battery capacity represents the maximum amount of energy that can be extracted from the battery under certain specified conditions. Capacity of a battery is expressed in terms of Ampere Hour (Ah). It indicates the rate of current a battery can supply for a given duration. If the capacity of a battery is 100 Ah, that battery can supply 100 Ampere current for 1 hour or 1 Ampere Current for 100 hours
The Energy Consumption calculator is used to calculate the total connected load as well as daily energy consumption of a household, a factory or an office. While the daily energy consumption along with a number of other parameters are used in calculating the PV system and battery size size, the inverter size is calculated by using the total connected wattage of all appliances.
Tilt direction is the direction in which the Solar PV panels face.
The degree which the Solar panel mounting system makes with the ground
Photovoltaic (PV) panels collect solar radiation directly from the sun, from the sky, and from sunlight reflected off the ground or area surrounding the PV panel. Orienting the PV panel in a direction and tilt to maximize its exposure to direct sunlight will optimize the collection efficiency. The panel will collect solar radiation most efficiently when the sun's rays are perpendicular to the panel's surface. The angle of the sun varies throughout the year. Therefore, the optimal tilt angle for a PV panel in the winter will differ from the optimal tilt angle for the summer.
Peak sun-hours are not the same as hours of sunlight. Sunrise to sunset represents hours of sunlight. But peak sun-hours describe how much solar energy is available during a day. The daily amount of solar radiation striking any location on earth varies from sunrise to sunset due to clouds, the sun’s position in the sky, and what’s mixed into the atmosphere. Maximum solar radiation occurs at solar noon—the time when the sun is highest in the sky, compared to the rest of the day. Sunlight in the morning and evening does not deliver as much energy to the earth’s surface as it does at midday because at low angles more atmosphere filters the sunlight. Besides day-to-day differences, there are also seasonal effects. In midsummer, due to the sun’s higher position in the sky, an hour of sunshine packs more energy than the same hour of sunshine in the winter. A peak sun-hour is roughly the amount of solar energy striking a 1-square-meter area perpendicular to the sun’s location over a 1-hour period straddling solar noon in the summertime. (Source: Larry Owens)
Peak Sunshine hours may differ as per different regions in India. For more precise calculations we recommend that users should use the exact peak sunshine hours if known. The source used in calculating peak sunlight hours is the Solar irradiance calculator of the Solar Handbook 2015. This irradiance calculator takes data collated over a 22 year period to provide monthly average insolation figures.The methodology behind calculting the Sunlight hours is we have considered cities from all over India and have taken the monthly average insolation figures of each city.
The availability factor of a power plant is the percentage of the time that it is available to provide energy to the grid. The availability of a plant is mostly a factor of its reliability and of the periodic maintenance it requires. The availability of Solar PV plants can reach over 98%.
Losses due to dust, dirt, snow, temperature, wiring, shading, etc
Some of the losses are as below
  1. Losses in PV modules due to conversion of solar radiation to DC electricity
  2. Losses in interconnections and cables,
  3. Losses due to dirt, snow, icing and soiling,
  4. Self-shading of PV modules
  5. Inverter efficiency losses
  6. Battery efficiency
  7. Losses in AC section and transformer (where applicable) depend on the system architecture
  8. Losses due to downtime caused by maintenance or failures
  9. Temperature
Losses due to shading are included in calculations. However we do not consider the effects of shading on a case by case basis.
Solar Irradiation is a measure of how much solar power you are getting at your location. This irradiance varies throughout the year depending on the seasons. It also varies throughout the day, depending on the position of the sun in the sky, and the weather.
Global Horizontal Irradiation (GHI) is the radiation received by a horizontal plane to the surface of the earth. The GHI is mainly used to calculate the PV Electricity yield.
Global In-Plane Irradiation or Global Tilted Irradiation (GTI) is the total radiation that falls on a tilted surface. The GTI is an important parameter for PV system designers. PV modules may be installed on different mounting systems such as flat, tilted, 1-axis or 2-axis tracking, etc. For each mounting system, GTI is calculated individually.. (Geo Model Solar)
The performance ratio (PR) of a PV installation is defined by the difference between the actual energy yield of a site (production energy), and the expected energy of the site, based on the module type and environmental sensor measurements. The PR value ranges between 0 and 1 and is used to evaluate the PV system performance: A high PR indicates a properly operating site. The PR to compare the performance of several systems in different locations, monitor a site’s performance over time and check if a site is meeting its energy production targets
A Solar PV system with high efficiency can achieve a PR of upto 80%.
A 1 kW rooftop system generally requires 12 sq. metres (130 square feet) of flat, shadow-free area (preferably south-facing in India). Actual sizing, however, depends also on local factors of solar radiation and weather conditions and shape of the roof.We have not taken into account space requirements in our calculations and assume that sufficient shadow-free space shall be available at the user's site.
The Electricity production is the potential of Electricity that your site can produce. It does not relate to the PV energy potential. As the SolarGIS PV planner software helps in site assessment it helps you to understand the potential that your site has to produce electricity.
As India lies in the Northern Hemisphere the ideal direction to point your solar panels in India is South.


Central Electricity Regulatory Commission (CERC), a key regulator of power sector in India, is a statutory body functioning with quasi-judicial status under sec – 76 of the Electricity Act 2003. CERC was initially constituted on 24 July 1998 under the Ministry of Power’s Electricity Regulatory Commissions Act, 1998 for rationalization of electricity tariffs, transparent policies regarding subsidies, promotion of efficient and environmentally benign policies, and for matters connected Electricity Tariff regulation. CERC was instituted primarily to regulate the tariff of Power Generating companies owned or controlled by the government of India, and any other generating company which has a composite scheme for power generation and interstate transmission of energy, including tariffs of generating companies.
The financial assumptions considered are as follows - Auxiliary Consumption: 0.00 %, Capacity Utilization Factor: 19 %, Useful Life: 25 Years, Deration factor: 70 %, Debt: 70 %, Equity: 30 %, Repayment Period: 12 Years, No. of Payments / Year: 4, Total no. of Payments: 48, Return on Equity (first 10 years): 20.00 % pa, Return on Equity (11th year onwards): 24.00 % pa, Weighted Average of ROE: 22.40 %, Discount Rate: 10.81 %, O&M Charges: 1 Month(s) , Maintenance Spares (% of O&M): 15 %, Receivable for Debtors: 2 Months, Interest on Working capital: 13.5 % , Income Tax: 33.990 %, Depreciation Rate (first 12 years): 5.83 %, Depreciation Rate (13th year onwards): 1.54 %, O&M expenses: 13 Lakh/MW, O&M expenses escalation: 5.72%
In the year 2015-16, Central Electricity Regulatory Commission has given the benchmark capital cost for solar PV projects as 605.85 lakhs/ MW. Actual cost would depend on site location, components selection, contractor hired etc.
Several tax/duty exemptions are available for solar plants depending on the respective state solar policies where the plants are located. You may contact the respective State Nodal Agencies for more details.
Cashflow is the difference between the available cash at the beginning of an accounting period and that at the end of the period. Cash inflow comes in from sales, loan proceeds, investments and the sale of assets and Cash Outflow goes out to pay for operating and direct expenses, principal debt service, and the purchase of asset
Electricity Tariff refers to the amount of money the consumer has to pay for making the power available to them at their homes.
Sale of Electricity is the revenue generated by selling electricity that your PV plant/project produces. The Sale of Electricity is calculated by multiplying the Net energy generated by the total cost of generation (per unit tariff component)
Levelised tariff in the power sector essentially refers to the average fixed and variable tariff over the entire term of the Power Purchase Agreement adjusted for inflation.
Principal payment is a payment toward the amount of principal owed.
Interest payment is the money paid by a borrower to a lender for a credit or a similar liability.
Debt repayment is the action of repaying total debts
Working Capital is the capital of a business which is used in its day-to-day trading operations
Depreciation is a reduction in the value of an asset over time, due in particular to wear and tear.
Accumulated depreciation is the total amount of a plant asset's cost that has been allocated to depreciation expense since the asset was put into service
Discount factor is the percentage rate required to calculate the present value of a future cash flow. Eg: If investing at 4% interest, then the present value is discounted by 4% as it is worth less than future earnings due to interest
The debt service coverage ratio (DSCR) measures how effectively the Solar plant’s generated income is able to cover outstanding debt payments. The DSCR is calculated by dividing the plant’s total net operating revenue during a given period by its total required payments on outstanding debts in the same periodEg: DSCR = Rs 1000 (net income) / Rs 900 debt payment = 1.11In this instance, the Solar plant generated 11% more income than it needed to meet its liability payments.DSCR is very important from the view point of the financing authority as it indicates repaying capability of the entity taking loan. 
Net Operating income is the annual income generated from your Solar PV plant / project after deducting all expenes incurred from operations. Net Operating income is the measure of the profitability of your Solar plant / project.
EBDIT stands for Earnings before Depreciation, Interests and Taxes sometimes also called profit before depreciation. EBDIT is a calculation of a company's or project's financial health and is one of the most important measures from an investors point of view.
The Deration factor is the loss of power efficiency due to factors such as DC to AC conversion, temperature, age, shading, sun tracking, etc.
Capacity Utilisation Factor (CUF) is the ratio of actual energy generated over the year to the equivalent energy output at its rated capacity over the yearly period
Auxiliary consumption is the power that may be required for air conditioning in inverter and control rooms, cleaning water softening and pumping system, security night lighting and general office lights and fans.
The NPV of a project or investment reflects the degree to which cash inflow, or revenue, equals or exceeds the amount of investment capital required to fund it. NPV can be used for accessing multiple Solar projects for comparing their relative profitability to ensure that only the most lucrative ventures are pursued. A higher NPV indicates that the project or investment is more profitable.
Internal rate of return (IRR) is the interest rate at which the net present value of all the cash flows (both positive and negative) from a project or investment equal zero. Internal rate of return is used to evaluate the attractiveness of a project or investment. If the IRR of a new project exceeds a company’s required rate of return, that project is desirable. If IRR falls below the required rate of return, the project should be rejected.
IRR (Project Pre-tax) helps you evaluate attractiveness of your Solar PV project or investment (pre-tax). Interests and debt are not included.
IRR (Project Post-tax) helps you evaluate attractiveness of your Solar PV project or investment (post-tax). Interests and debt are not included.
IRR (Equity Pre-Tax) is the Return on Equity (Pre-Tax) invested in a project including debt-service payments.
IRR (Equity Post-Tax) is the Return on Equity (Post-Tax) invested in a project including debt-service payments.
The payback period is the time required for the amount invested in an asset to be repaid by the net cash outflow generated by the asset. It is a simple way to evaluate the risk associated with a proposed project.
No, the price of batteries is not included in the project / system cost