Sineng PV Inverter
Waaree Energies

PV Diagnostics Offers Technical DD Lite For Faster, Realistic Solar IRR Predictions


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Tool for quick assessment of a solar portfolio for initial screening of different plants to develop a realistic estimate of energy generation for faster decision making and more accurate IRR predictions at pre-NBO stage.


Lite enables faster, customized & accurate analysis

01. Accurate Energy yield prediction at Pre-NBO

– Seller’s PV Syst adjusted as per actual data from plant
– Improvements considered based on operational & design parameters
– Re-powering potential checked

02. Faster decision making

– Web-based platform
– Automated data-upload and analysis
– Reports available on one click

03. Customizable output

– User can modify key assumptions
– E.g. availability, re-powering, solar resource
– Estimates for P50,75,90

Leverage data & PV-D’s technical and field expertise


Must haves

– As built PV-Syst
– Historical generation data
– Historical recorded radiation
– Module and inverter details


– Plant breakdown data
– Auxiliary consumption data
– Historical generation at multiple nodes
e.g. inverters, transformers, outgoing feeders, substation
– PAN & OND file for module and inverter make

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Adjustment for Actual losses

– Actual plant and grid availability
– AC/DC losses, auxiliary consumption, inverter i/o efficiency
– PR degradation based on historical trends

Adjustment for solar resource

– Comparison of different radiation sources with actual
– APIs to extract data from multiple sources
– Option to select the data source
– Recommendation based on field experience

Potential improvements

– Max. generation with improved plant availability or other parameters
– Re-powering potential
– Customization based on re-investment plan for modules


Realistic & Customized P50/75/90 generation & CUF estimate

Comparison of Lite results with full DD

50 MWp, Rajasthan

Key Differences between As-built & Lite

– The plant unavailability for Lite is as per TTM site data (0.40%) while it’s assumed to be 0 for as-built
– The POA-rad source for As-built is Solar GIS (6.13 kWh/m2/day) and for Lite is MN7.2 (6.01 kWh/m2/day), corrected based on field experience

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Key Differences between Lite & Full DD

– Module degradation in Lite is 0.71% as per module datasheet and in Full DD is 1.36% as module IV testing
– The POA-rad source for Lite is MN7.2 (6.01 kWh/m2/day) and for full DD is (6.27 kWh/m2/day) based on field data
– The Power trafo + TL loss is considered for Full DD as per TTM site data (1.03%) but not considered for Lite

Radiation Assessment

Key Differences between Lite & Full DD

– The plant unavailability for Lite is 2.12% and for Full DD is 3.48%
– The rate of module degradation for Lite is as per module datasheet and for Full DD is as per module flash test results
– The POA-rad source for Lite is(6.69 kWh/m2/day) and for full DD is (6.80 kWh/m2/day)
– The TL loss is considered for Full DD 0.99% as per TTM site data but for Lite it is not considered

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