Understand the layout and ground
Check module height, spacing, and tilt, as well as ground material and seasonal changes.
Solar & Sensing · APPLICATION GUIDE
Bifacial & Albedo
Ground reflectance and the light that actually reaches the rear of a module are different quantities.
Review selection pointsDiscuss this applicationFIELD APPLICATION & FLOW
See the application in its industrial setting.
Follow light, sensor measurements and data connections.
APPLICATION IN CONTEXT
- Front module input
- Rear POA at multiple positions
- Representative ground
- Up/down albedo pair
- Front, rear and ratio records
Connections to review
- 02 → 05 Measurement data
- 04 → 05 Measurement data
The up/down albedo pair is horizontal; rear POA sensors face the module rear. Representative measurement locations are reviewed for the actual array.
A conceptual illustration created to explain equipment and application locations. It is not an actual product photograph, installation photograph or piping/wiring design.
Connection principles and operating/test methods
Bifacial · Reflected light reaching the rear
LightMeasurement / control
Scroll horizontally to see the complete flow.
Rear POA and ground albedo are different measurements. Select representative rear measurement positions with structural shading and variation between locations in mind.
Albedo · Reflected-to-incident irradiance ratio
LightMeasurement / control
Scroll horizontally to see the complete flow.
Up-facing and down-facing refer to the direction the sensors face. Albedo is the ratio of reflected to incident irradiance measured on the same reference plane.
These conceptual views explain flow direction. Actual piping, wiring and physical flow rates require a separate design.
01 — PROCESS
Where and what will be measured?
Define the intended use and conditions to identify the required role of each item.
Design the measurement locations
Distinguish albedo measurements over representative ground from irradiance measurements at several rear locations.
Interpret performance
Compare front and rear irradiance, temperature, and energy generation using the same time reference.
02 — SELECTION
What should be selected and verified?
Albedo is the ratio of radiation reflected by the ground to radiation incident on it. Rear POA is the irradiance incident on the rear plane after the effects of structures, adjacent rows, height, and spacing; an albedo measurement alone cannot replace it.
Scroll horizontally to review all columns.
| Measurement objective | Item to review | Selection evidence |
|---|---|---|
| Ground reflectance | Upward and downward irradiance measurement | Representative ground, installation height, and shading from masts and sensors |
| Rear input | Rear POA | Obstruction by structures, spatial nonuniformity, and row-edge effects |
| Tracking arrays | Orientation and angle relationships | Rotation angle, backtracking, and sensor rotation with the tracker |
| Long-term comparison | Record changes in the ground | Snow cover, vegetation, moisture, ground treatment, and maintenance |
Review sensor suitability against the objective, installation environment, calibration evidence, system configuration and supplier specifications.
03 — OPERATING CHECKS
Use measurement data to identify improvements.
Document sensor locations on drawings
Record whether sensors are inside or outside a row, their height, and their position on the module so that the data can be interpreted.
Review how representative a single point is
Ground conditions and rear irradiance may be nonuniform, so select measurement points suited to the array layout and area.
Distinguish albedo from rear irradiance
Name the data channels clearly to avoid confusing the dimensionless albedo ratio with rear POA in W/m².
04 — QUESTIONS
Frequently asked questions
Does higher albedo increase rear power output by the same proportion?
The relationship depends on the array structure, obstructions, and module bifaciality factor, among other factors. A simple proportional increase cannot be guaranteed.
Is one rear sensor enough?
Decide based on the array, target uncertainty, and spatial variation. Review representative locations first.
05 — APPLICATION REVIEW
Prepare the conditions for a technical discussion.
These details help narrow the configuration and the evidence to review.
- Module and array drawings, and bifaciality factor
- Height, row spacing, tilt, and tracking method
- Ground material, vegetation, and snow cover
- Purpose: albedo/rear input/performance
- Sensor locations, quantity, and recording system
MANUFACTURER PRODUCTS
Explore product applications and their official sources.
Confirm model suitability and supply scope through a technical review. Use each card to make an enquiry or review official manufacturer information.
KIPP & ZONEN
SMP12
Class A pyranometer for digital solar irradiance measurement.
Enquire about this productOfficial manufacturer product information ↗
KIPP & ZONEN
RC22
A PV reference cell for irradiance measurement in monofacial and bifacial systems.
Enquire about this productOfficial manufacturer product information ↗Product photographs and manufacturer images use permitted official materials and source links. Original explanatory schematics are identified separately from actual product photographs.