PV Modules: Bifacial technology
Current status
go PV
Cooling: Tracker Topology
VV (h)
√√ch)
Fast/cool
Medium
Slow/hot
Fast/cool
16 ft
33 ft
Medium
Slow/hot
イ
イ
Average
GCR 40%
Pitch
AT
AEnergy
Temp.
1P Tracker
2P Tracker
5 m
10 m
33.96°C
3.52°C
1.3%
30.44°C
30.3°C
34.3°C
36.3°C
Temperature
30
Height
1-in-P
2-in-P
Average Module Temperatures
in Uc Function
25
15
Uc W/m'k
Higher module and pitch promotes better cooling.
Cooling reduces module temperature and increases energy yield.
The information contained in this presentation may be subject to confidentiality
BITEC Field Data 1P vs 2P
-
1P Standard
Measured
2P SF7
Tracker
Bifacial Gain
Bifacial
16.8%
Fall 2018
19.2%
12,6%
Winter 2019
14,3%
10,4%
Spring 2019
1.35m
12.1%
13,7%
Summer 2019
15,8%
Yield + 2.1%
16,6%
Fall 2019
19,5%
16,8%
Winter 2020
13.6%
15.7%
12.5%
Spring 2020
18,7%
14,5%
GCR 0.4 Albedo = 55.6%
2.35m
Test Considerations:
8
Soltec
Results based on energy
performance at module level
Only internal Trackers considered
(avoid effect of higher diffuse on
external Trackers)
Only central modules considered
(avoid effect of higher diffuse on
edge modules)
Results expected to be the average
for large utility scale plants
⚫ Geotextile AEM
With bigger spaces between Trackers easies the
access for cleaning and trimming the grass.
Higher Trackers allow bigger machinery to reach
the whole surface underneath
Effective height useful for bifacial reflection
depends on the gras level, so relative height does.
Down
2.2m
2.35m
Down
0,5m
1P trackers
2P Soltec trackers
influence of useful tracker height in relation to vegetation growth 1P vs. 2P. Source: Solter
4.1m
Up
Relative height (p.u.)
0.80
0.60
0,50
0,40
0.30
0
20
Grass height (cm)
1P-50cm
10-30cm
2P-50cm
60
The information contained in this presentation may be subject to confidentiality
obligatione arising frum Softec's contractual relationships with third parties
NX Horizon (1P) vs NX Gemini (2P): Beyond BF Gain
9
Soltec
Bifacial Gain is not the only Metric. System-level design affects total energy yield
For a constrained site with irregular boundaries:
nextracker
COMPON
NX Horizon
37% GCR
Bifacial PV Tracking: The Simulation and Optimization of Yield Gain. Soltec webinar. Apr 2018
Optimizing Plant Performance with Smart Solar Trackers & Bifacial Technology. Melissa Cooke, Nextracker. BiFi July 2020.
NX Gemini
35% GCR
+~0.5% yield
2020 NEXTRACKER Proprietory & Confidential 20
tecnalia
Inspiring
Business
Early Findings: NX Horizon (1P) vs NX Gemini (2P)
Near Identical Monofacial Performance, 1.3-2.4% Higher Bifacial Gain on NX Horizon (1P)
NX Horizon (1P)
31% GCR
1.5m Axis Height
NX Gemini (2P)
31% GCR
2.05m Axis Height
High Albedo
1st half March 2020
Low Albedo
2nd half March 2020
11.4 96
519
Bifacial Whitepaper with modeled vs. measured analysis to be released Q3 2020
nextracker
Company
9.0 %
3.8 %
one Contidense bood
GoPV Project | 1st TRAINING COURSES
TECHNICAL FOCUS ON FUTURE SOLAR PV SYSTEMS
October 26-29th 2020View entire presentation