Tech Choice: Top Rooftop Solar Modules of 2019


JinkoSolar – Cheetah Mono PERC HC

To achieve grid parity, JinkoSolar pursued the development of advanced PV technologies, thereby reducing the cost of renewable energy. Cheetah fulfils this purpose. Credits to its ultra-high module efficiency.

Cheetah enters a new paradigm, with a new wafer size, new cell design and updated module concept that will keep pushing power results higher, even above 415 Wp. Now you can have one of the most powerful (and one of the most economically feasible) solar panels that are commercially available for purchase today. With power up to 415 Wp, Cheetah will maximize your PV system capacity, generating more energy over 25 years and maximizing the customer’s economic returns. Cheetah’s ultra-high output occupies less area for a given power output goal. With more watts on the roof, power density is improved and the installation costs per watt are significantly reduced. Cheetah’s high module power delivers improved power density, leading to less land usage, and reductions in both BOS and labour costs.

The half cell design ensures an improved shading response, resulting in higher yields when the module is partially shaded. Shading loss experienced by half-cell modules is much better than conventional modules in certain shading conditions. It also offers positive power tolerance of 3%, against industry practice of 5 Wp.

Cheetah has an improved temperature coefficient of Pmax -0.35%/°C. Real world energy output can be increased up to 1% per day, perfect for delivering more electricity on hot summer days. It ensures reliability by achieving certification at twice of the industry Anti-PID standard, and the intensity specified in the IEC standard.

Goldi Solar – 72GN Series Polycrystalline Module & 72GN1 Series Monocrystalline Module

72GN Series Polycrystalline Module:

Goldi Solar’s 72GN Series Polycrystalline module is one of the best PID Free module under the various climatic conditions ranging from -40℃ to + 85℃. It can be used for all applications, especially ideal for installations in regions of high temperature and high humidity. It sets a new standard of reliability and performance for photovoltaic systems. With power classes of up to 335Wp, 72GN Series Polycrystalline is the most powerful 72-cell module of its type available in the market. Being one of the best PID Free module in the market it ensures highest reliability under all extreme conditions.

•             Excellent module conversion efficiency of up to 17.31%

•             Up to +2% positive power output guaranteed

•             Loss minimization due to excellent temperature co-efficient

•             BOS cost reduction for 1500 VDC System by connecting more modules in a string

•             Reducing equipment loss & increases the power generation in overall system

•             Better performance even at low irradiance condition

•             Higher specific yield

72GN1 Series Monocrystalline Module:

Goldi Solar’s 72GN1 Series Monocrystalline Module is known for durability, performance, efficiency, and high-power output. Goldi Solar manufactures some of the most efficient and highest quality solar modules in the world. This 72GN1 Series module uses a more advanced double-sided solar cell, which also produces energy from reflected light off the rear of the module and it generates power class up to 380Wp. The reinforced frame and the module’s ability can withstand snow load up to 5400 Pa and wind load up to 2400 Pa. Goldi Solar promises the warranty, for a product up to 10 years and performance up to 25 years. The power warranty promises 90% of generation for 10 years and 80% for 25 years. 72GN1 Series module offering 375Wp is one of the most in-demand modules for the rooftop installations providing best in-class quality and performance.

•             Excellent module conversion efficiency of up to 19.63%

•             Up to +2% positive power output guaranteed

•             Loss minimization due to excellent temperature co-efficient

•             BOS cost reduction for 1500 VDC System by connecting more modules in a string

•             Reducing equipment loss & increases the power generation in overall system

•             Better performance even at low irradiance condition

•             Higher specific yield

WaareeSuper 400 Series

Rooftops have many specific challenges like limited space, local shading to name a few, so conventional module is not an optimum option. Hence, a novel design upgradation along with large wafer size and half cut solar cells was developed. Introducing 400 Wp modules – The first product with such power output in Indian PV market (Figure 1). The modules utilize larger wafer size and highly efficient full square Mono PERC solar cells. The modules are available in 2 variants mono facial (Super 400) and Bifacial variant (Super 400 Pro).

Figure 1: Super 400 Series by Waaree Energies. Super 400 (Top) and Super 400 Pro (Bottom)

Significant reduction in resistive losses

The super 400 series modules use half cut cells which directly halves the current output from the cell. Halving the current reduces the resistive losses (I2R) of the module by one fourth. Primarily this reduction in resistive losses directly reduces the nominal module operating temperature (NMOT). Additionally, such gain is improved significantly with increase in irradiance as the current output of the module is directly proportional to the irradiance.

Advantages of enhanced design

Compared to the traditional modules, the excited electrons in the super 400 module have to travel almost half the distance before they are connected at the module’s junction box (JB). Comparing to traditional module, the electron faces less resistance which further increases the power output of the module (refer to Figure2).

Figure 2: The path travelled by exited electron in traditional module (on left) and super 400 module (on right)

Better performance in shade

For a rooftop site, there may be times when a module experiences shadow. Such shadow may be due to many reasons such as expansion of nearby building, shadow due to nearby trees, bird shit, cloudy atmospheric conditions etc. which may be temporary, for few hours or days or even permanent. Shadow even if on any cell(s) in the string hampers the generation of the string and hence the solar module. Under normal operation, both the traditional and doublet module produces the desired power output. But when all the strings of the traditional module are under shadow all 3 bypass diodes of the module are activated resulting in zero power output from the module. Whereas in case of super 400 module, the bypass diode is in between the two strings of upper and lower half of module. While the lower half is under shadow, the upper half of the module is continuously generating power. Hence, 50% of power under shadow conditions is retained.

Figure 3: Effect of shadow on traditional and super 400 module

Saatvik – SGE 60M and SGE 72M Mono PERC Series

Saatvik Green Energy is a new age solar technology company, involved in the manufacturing of high quality solar modules, with an in-house manufacturing capacity of 500MW. The current product portfolio includes solar modules ranging from 40Wp up to 380Wp. Saatvik uses both poly-crystalline and mono-crystalline cells to assemble these solar modules, coupled with multiple rounds of testing, during and after, the manufacturing process, ensuring the highest quality product for its esteemed customers. All module ranges have been certified to highest global quality standards such as IEC 61215/IS 14286, IEC/IS 61730, IEC 62804, IEC 61701, IEC 62716, IEC 60068, UL 1703 and IEC 62759.

Saatvik has successfully delivered more than 150 MW solar modules in its first 2 years of operation, which have been successfully installed at various ground mounted projects, government buildings, government utilities, railway stations, hotels and universities.

Saatvik’s SGE 60M and SGE 72M Mono PERC Series, has successfully completed testing for the entire range of IEC & BIS certifications, which gives Saatvik further competitive edge in the solar industry. Saatvik supports continuous adoption of new and advanced technology by the solution providers, and endeavors to provide them with the same for overall growth of the industry. Usage of Monocrystalline panels gives an additional advantage to the solution providers as they can install more capacity in limited space. SGE Mono PERC Series is assembled on the same platform as the highest selling SGE Poly series, offering maximum reliability to its clients. It delivers a module level efficiency of as high as 19.45%, has high resistance to PID, can withstand 2400 Pascal wind load and 5400 Pascal snow load. The current range offering is from SGE 72M – 365Wp to 380Wp.

Technology Advancements

  • High module conversion efficiency.
  • Outstanding power performance even at low irradiance.
  • High PID resistant.
  • Easy to mount and ground.
  • IP67 junction box with extended cable lengths for easier installation.
  • Double stage EL tested.
  • Extended Mechanical load tested up-to 5400 pascals.
  • 25-year linear power performance warranty.
  • 10-years workmanship warranty.
  • Also, available with black/transparent back sheet and black frame.

We are targeting solar developers and EPC companies to help them achieve highest yields on their installations. They will get additional advantage over the already existing range of SGE Solar PV modules. This product is most suited for rooftop projects, in high electricity consuming industries, commercial spaces, with paucity of roofs, so that they can maximize their solar generation.

Spark Solar – BIPV Panels

Spark Solar Building-integrated photovoltaics (BIPV) panels are used to replace conventional building materials in parts of the building such as the roof, skylights, or facades. They are increasingly being incorporated into the construction of new buildings as a principal or ancillary source of electrical power, although existing buildings may be retrofitted with similar technology. The advantage of integrated photovoltaics over more common non-integrated systems is that the initial cost can be offset by reducing the amount spent on building materials and labor that would normally be used to construct the part of the building that the BIPV modules replace.

Spark solar BIPV panel is integrated into the building fabric rather than a ‘tack-on’ addition replacing conventional building cladding materials but with the added benefit of producing renewable electricity.

Spark Solar’s unique transparent PV solutions add a new dimension to BIPV by allowing and facilitating full PV building integration from facades to windows. With these technologies we anticipate that the future of PV is BIPV. The key advantage of BIPV is that the marginal additional cost in installation is more than offset by the production of renewable energy, this is why BIPV is one of the fastest growing segments of the photovoltaic industry.

In a environment that is pushing for zero carbon buildings, aesthetically pleasing BIPV solutions are becoming increasingly required by the urban environment.

In multi-storey buildings where roof space in often limited, facades and glazing offer additional surfaces with huge potential of generating electricity. 

Spark Solar’s BIPV panels are ideal for incorporating into building envelopes due to their frameless design, aesthetic finish, and variable transparency. For these reasons Spark Solar’s BIPV is proving to be one of the only strategies available for renewable energy generation in the built environment.

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