𝐺𝛾 = 𝐵𝛾 + 𝐷𝛾 + 𝑅𝛾
𝐺𝛾 = 𝐺𝑙𝑜𝑏𝑎𝑙 𝑃𝑙𝑎𝑛𝑒 𝑜𝑓 𝐼𝑟𝑟𝑎𝑑𝑖𝑎𝑛𝑐𝑒 𝑃𝑂𝐴
𝐵𝛾 = 𝐼𝑟𝑟𝑎𝑑𝑖𝑎𝑛𝑐𝑒 𝐷𝑖𝑟𝑒𝑐𝑡𝑙𝑦 𝑓𝑟𝑜𝑚 𝑡ℎ𝑒 𝐵𝑒𝑎𝑚 (𝐷𝑁𝐼)
𝐷𝛾 = 𝐷𝑖𝑓𝑓𝑢𝑠𝑒𝑑 𝐼𝑟𝑟𝑎𝑑𝑖𝑎𝑛𝑐𝑒 𝑓𝑟𝑜𝑚 𝑡ℎ𝑒 𝐶𝑙𝑜𝑢𝑑𝑠, 𝑆𝑘𝑦 𝑎𝑛𝑑 𝐸𝑛𝑣𝑖𝑟𝑜𝑛𝑚𝑒𝑛𝑡 (𝐷𝐻𝐼)
𝑅𝛾 = 𝐼𝑟𝑟𝑎𝑑𝑖𝑎𝑛𝑐𝑒 𝑓𝑟𝑜𝑚 𝑔𝑟𝑜𝑢𝑛𝑑 𝑟𝑒𝑓𝑙𝑒𝑐𝑡𝑖𝑜𝑛 𝐴𝑙𝑏𝑒𝑑𝑜
The traditional Irradiance model sums all known irradiance to derive the Total
Irradiance (POA):

Concept
◦ Policy decisions (agriculture, weather prediction)
◦ Site and Technology Selection (weather, geography, environmental impact)
Feasibility
◦ Investor commitment (yield forecasts, photobiology, environment, and impact assessment)
Due Diligence
◦ Engineering Design
◦ System Integration
Operations
◦ Operations and maintenance
◦ Energy System Integration
◦ Yield Optimisation

DIRECT MEASUREMENT METHOD:
 Pyrheliometer:
Measure direct normal irradiance, irradiance immitted directly from the sun
 Pyranometer:
Upwards facing sensor to measure 180° or horizontal irradiance in the atmosphere
 Albedometer:
An inverted Pyranometer to measure ground reflection
OR
GEOGRAPHICAL AND MATHEMATICAL MODELS:
 DIRINT / DISC:
Predictive models to estimate direct normal irradiance (DNI/DHI) from time-series historical data

A Pyrheliometer is an instrument designed specifically to
measure the direct beam solar irradiance with a narrow field of
view.
◦ A two-axis moving thermocouple
◦ Tracks sun movement through a narrow aperture
◦ Considered accurate capture of direct irradiance
◦ Most of commercial sky imagers are costly, restricting their
use to low-cost applications
◦ A Pyrheliometer is one of the most significant investments in
any irradiance measurement setup

Through multiple instantaneous data capture on 14 fixed
position cells, can produce a combined model of 91
mathematical representations of DHI and DNI simultaneously.
Solar Sphere has no moving parts
Lower cost components
Uses known and readily available models for measuring
irradiance
Significant out-performance of existing predictive irradiance
models (DIRINT)