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Mono Vs Poly – An Introspective Simulation Study! – Part 3

While the previous two parts of the article “Mono vs Poly – An introspective simulation study! – Part 1 & Part 2” introduced the types of crystalline technology, the need for this study, the methodology of study and detailed technical results of all climatic zones, this part would present a financial analysis of both the plants and educate its readers on the key takeaways from the study.

Figure 1: Division of climatic zones in India (Source: IIT Bombay)

Financial analysis

With the energy sources around the world constantly increasing, it is important for a source to be commercially viable and give back good returns to ensure its widespread uptake. In such situations, only proving a source’s technical superiority may just not be enough. An in-depth financial analysis and its gains need to be identified in detail. The initial cost break up of a solar power plant is well known and is well represented by various bodies. In such break-up, the solar modules constitute more than 50% of the cost, whereas the BoS accounts for around 35% of the cost. The civil works and other costs constitute merely 13% of the cost. While the number stands true, the comparison between mono and polycrystalline technology paints a different picture.

The study presented two different scenarios; the financial analysis, however, is calculated on per MW basis to fairly evaluate the technology. Firstly, the fact that the initial cost of monocrystalline technology is more cannot be argued upon. This leads to a sharp increase in the module’s initial price i.e. ~21% higher than polycrystalline technology. However, now with the changing dynamics in the PV market of the world and with the world demanding higher energy from the same module size, the prices of monocrystalline PV modules are deemed to fall down drastically. It is an already known fact that monocrystalline module (of similar sizes) are usually at 1~2% higher efficiency than the polycrystalline modules. This efficiency advantage leads to a direct 12% reduction in a number of solar modules required per MW of the power plant when utilizing monocrystalline technology. Further, considering a standard double racking design in a power plant, the cost savings in module mounting structure installed in monocrystalline modules is 0.25% (when compared to a polycrystalline module based plant). Considering the land requirement, significant savings could be clearly realized in a monocrystalline based power plant. Considering central inverter in both the cases, we find that a mono based power plant could use 31% less land (and hence 31% less cost) compared to polycrystalline module based plant.

While designing a power plant, adequate care needs to be taken to ensure that the electrical losses are minimal and/or within the tolerance limits. One of the easiest yet important parameter to optimize is the DC voltage drop in cables. The drop depends primarily on the internal resistance of the cable which is further governed by the length and the cross-sectional area of the cable. With an increase in the number of modules to be utilized in a polycrystalline technology-based power plant, the length of the cable increases which directly increases the internal resistance of the wire. In order to mitigate such losses, the cross-sectional area of the cable needs to be increased. Both increases in length and area acts as a double whammy increasing the cabling cost of the module by around 10.50% when compared to a monocrystalline based power plant. Operation & maintenance (O&M) plays a significant role in any power plant if it is to run smoothly and perform as expected. Considering the case of a solar power plant, as a rule of thumb O&M cost is considered only to be around 1% annually of the plant’s total cost. However, with the need to clean & maintain more modules, AJB’s and other DC spares in a polycrystalline based power plant its cost raises significantly. It was found that in a monocrystalline based power plant, savings in O&M cost to the tune of 38% could be realized (refer Figure 2).

Figure 2: Difference in investments incurred per MW during the life time of the power plant

 

Figure 3: Savings realized while utilizing mono crystalline technology over the plant lifetime

With both the incurred cost and energy generated in the favour of mono crystalline technology, it should be clear by now that mono crystalline technology which looks expensive, is actually profitable in the longer run. For the purpose of study, savings across each and every climatic zone was calculated. Hot & dry zone which is expected to have enhanced savings due to temperature loss is expected to realize 9.54% of savings by utilizing mono crystalline technology. Followed to this is the moderate climatic zone at 9.49% which due to lower ambient temperatures (around the year) are expected to generate adequate energy. This is followed by composite zone at 9.37% and warm & humid zone at 9.12% which due to higher ambient temperatures experience modest savings in the northern and few north eastern parts of India, the savings for both cold & sunny and cold & cloudy are around 9%, which could again be attributed to lower ambient temperatures.

Conclusion

Mono crystalline versus poly crystalline has been one of the hot topics of discussion amongst various stakeholders at different platforms. While there has been lot of information available on the matter, a complete guide seems always missing. Further with the clear trends of the PV market tilting towards mono crystalline technology, the adoptability of PV modules in the Indian market is still primarily based on cost. It was hence necessary to evaluate the technology fully till its end of life and further carry out both technical and commercial analysis for a clear understanding. The following were the results obtained from the study (refer Table 1 & Table 2 for details): 􀃂 Utilizing mono crystalline module enable efficient utilization of land by generating 41 MWh to 52 MWh more per fixed area (1000m2). This further converts to 8 MWh/MWp to 14 MWh/MWp more energy injected into the grid annually. 􀃂 A boost in performance ratio (PR) of 3.0% (average) is found when utilizing mono crystalline technology in power plant with limited area availability. Utilizing the power plant with fixed capacity, mono crystalline technology was able to deliver a PR boost from 0.40 to 0.80% 􀃂 Mono crystalline technology has a better performance at location with enhanced ambient temperatures and hence acts as a perfect match for countries like India which lie between the tropics. 􀃂 Utilizing mono crystalline modules would enable savings in total investment over the plant’s life time to the tune of 8.94% to 9.54% annually. 􀃂 Implementing mono crystalline module to have ROI reduced between 0.5~2 years considering economies of scale Let us all pledge to make solar energy the primary source of energy in the near future.

 

Mr. Sunil Rathi Director- Sales & Marketing Waaree Energies Ltd

 

 

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