This document analyzes the generation of a 1.1 MWp single-axis solar tracker plant in Karnataka over one year. The plant used Canadian Solar panels and an ABB 1MW inverter. It generated 1.942 MW per MWp installed capacity in its first year of operation from November 2016, achieving a capacity utilization factor of around 21% on average. Single-axis trackers provided steady power generation throughout the day and reduced the impact of grid downtime compared to fixed-tilt systems.

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ANALYSIS OF 1 YEAR’S GENERATION OF 1.1 MWP SCORPIUS
TRACKER PLANT IN KARNATAKA
SYNOPSIS OF PLANT
1. Canadian Solar Panels
2. ABB PV800 1MW AC Central inverter
3. BLOCK Design of 268.8 KWpx2, 282.24 KWpx2
4. Inter ROW pitch at 5.5 metres, 3.5m clear path between rows for cleaning
5. Loading of 10% on DC
6. Grid downtime of 8.8% across the year
7. PVSyst indicated a generation yield of 1.91 MU / MWp
8. Power Evac at 11KVA – Nirantar Jyoti Scheme
9. Generation normalized at 1MWp
10. Fully Operational Nov 2016
11. Plant setup under 14 weeks: Civil 4 weeks, Structures erection plus Module
Mounting 8 weeks and Trackers Commissioning 1-2 weeks.
EXPECTATION FROM PLANT
Table 1: PVSyst Simulation
The parameters for the location were based on Meteonorm 6.1 which has ± 9%
variation based on site conditions. Due to the unavailability of Fixed / Seasonal tilt data
no comparison can be made. The generation was expected to cross 1.9MU on
average over a 10 year time frame.
GENERATION ACHIEVED : 1.942 MW per MWp generated in ONE YEAR
(generation number accounts for % grid downtime observed at Inverter, taking into consideration an averaged generic generation loss in percentage without considering
seasonal variation of radiation)

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The below graph shows the superb CUF of the plant, which clearly proves the
advantages of trackers over Fixed Tilt systems, especially where DC loading brings in
a lot of value addition in reducing AC+DC side BOS Costs. The voltage reduction due
to horizontal position allows for accommodating more panels per string thus ensuring
early wakeup and generation up to late evening.
ScreenShot 1: 31% CUF Day
The ability to deliver consistent power as well as reduce the impact of backdowns with
Zero failure rate on tracking components resulted in just 8.9% reduction in power
delivered compared to Fixed Tilt or Seasonal for which impact would be much more
severe. Please refer to Screenshot 2
Screenshot 2: Grid downtime has lowered effect in SAT, whereas FT/Seasonal Tilt would generate
almost zero

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The generation of the plant has seen the following
1. Highest generation from Feb to May
2. Consistent delivery during summer months
3. CUF above 20% >57%
4. Average CUF across the year of ~21%
Table 2: Monthly CUF
2.37% 1.78%
5.93%
13.65%
18.99%
21.96%
28.78%
6.53%
0.00%
5.00%
10.00%
15.00%
20.00%
25.00%
30.00%
35.00%
4% 8% 12% 16% 20% 24% 28% 32%
Frequency
Bin
CUF
Frequency
0.00%
5.00%
10.00%
15.00%
20.00%
25.00%
30.00%
Jan-17 Feb-17 Mar-17 Apr-17 May-17 Jun-17 Jul-17 Aug-17 Sep-17 Oct-17 Nov-17 Dec-17
CUF

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The benefits of trackers increases significantly when closer to the equatorial line and
in a good DNI environment.
Trackers provide steady and continuous power throughout the day enabling maximum
solar radiation capture. This translates into clean, efficient and dependable power to
run commercial, industrial and day based activities without encountering the need for
storage thus enabling a better, pollution free nation.
The limitations of fixed tilt are highlighted below in the graphs which provide a glimpse
of the benefits that Scorpius Trackers brings to the table.
Below, you can see a sample extract of daily power generation curves for a site using
Meteonorm 6.1values
January
April

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June
August
October

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Throughout the year, the power generation and performance is far more robust using
Scorpius Tracker Technology, which leaves little to chance with the possibility of an
upside unlike older outdated technology.
Key features for Scorpius Single Axis Trackers are
1. Earlier in day + Smoother Generation Curve, sufficient for commercial, industrial
and day loads
2. Higher Inverter Efficiency due to lower overloading requirement, Reduced Cooling
needs for Inverters due to less need for oversizing
3. Maximum generation vs Fixed Tilt
4. Structures stability at high wind speeds of 115 mph validated using Boundary
Layer Wind Tunnel Testing
5. Higher DC Overloading Capacity compared to Seasonal and Fixed Tilt Structures
6. Zero Solar PV cell cracking issues, unlike Seasonal Tilt movement mechanisms
7. Optimized Grid Efficiency + Utilization
8. Minimal Grid back down effect vs Fixed Tilt
9. Reduced O&M due to lesser panel cleaning needs, Bushing Mechanical Life of
150 years
10. Agricultural ground use possible

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