RE Display System 2 at
RISE Outdoor Test Area |
Inverter Sizing |
Parameter |
Label |
Notes |
| Inverter
efficiency |
85 % |
M3 |
From
Initial design Specification |
| System
Voltage |
48 Vdc |
M8 |
From
Initial design Specification |
| Inverter
voltage |
240Vac |
|
From
Initial design Specification |
| |
|
|
|
| Design Load Energy (Winter) |
7331 Wh |
M4 |
from Energy
Calculation AC10a for dry season or winter / M3 |
| Design Load Energy (Summer) |
11334 Wh |
M5 |
from Energy
Calculation AC10b for wet season or summer / M3 |
|
Inverter 1/2 h max demand |
3564 VA |
IN1 |
from Energy
Calculation AC11 |
|
Surge Demand |
6214 VA |
IN2 |
from Energy
Calculation AC12 |
| Suggested inverter 1/2 h max rating |
3920 VA |
IN4 |
Selected
based on Maximum 1/2 h demand + 10% |
| Suggested inverter surge rating |
6835 VA |
IN5 |
Selected
based on Surge demand + 10% |
| Selected inverter
Specifications |
PSA RAPS-3-48-1 |
IN8 |
|
| Inverter peak
efficiency (500W) |
92% |
|
|
| Continuous @ 40 ° |
3000 VA |
IN10 |
From manufacturers data |
| 1 hour @ 40 ° |
3600 VA |
|
|
| 30 minute @ 40 ° |
3900 VA |
IN9 |
|
| Surge Rating @
40° |
6000 VA |
IN11 |
|
| |
|
|
|
Battery sizing |
|
|
|
| Design load energy for battery sizing |
11334 Wh |
B1 |
The larger of M4 or M5 |
| Design load Ah for battery sizing |
236 Ah |
B2 |
B1/M8 |
| Number of days
of autonomy |
2.5 Days |
B3 |
From
Initial design Specification |
| Max depth of
discharge |
60% |
B4 |
From
Initial design Specification |
| Nominal battery discharge rate |
C100 |
B5 |
Design decision |
| Lowest 24 hr
Temperature |
15°C |
B6 |
From climatic data |
| Temperature
Correction Factor |
0.98 |
B7 |
From
battery specifications |
| Required Battery Capacity |
1004 Ah |
B8 |
(B2 x B3)/(B4 x B7) |
| Selected
battery |
Exide Energystore 6RP1080 |
B9 |
Selected |
| A-hr capacity
of selected battery |
1080Ah |
B10 |
From
battery specifications |
| Selected
Battery Voltage |
6 V |
B11 |
From
battery specifications |
| Number of
strings in parrallel |
1 |
B12 |
=B8/B10
(Rounded off) |
| Number of
batteries in series |
8 |
B13 |
=M8/B11 |
| Capacity of battery bank at nominal discharge rate |
1080Ah |
B14 |
B10 x B12 |
| Days of autonomy for selected battery |
2.7 Days |
B15 |
(B4 x B14 x B7)/B2 |
| Nominal daily DoD |
22% |
B16 |
B2/B14 |
| Total number
of batteries |
8 |
|
=B12 x B13 |
| |
|
|
|
Photovoltaic Array sizing |
|
|
|
| Design
tilt |
45° |
M6 |
From
Initial design Specification |
| Design
Month |
Worst |
DM4 |
From Design month analysis and considering wind contribution |
| Battery
efficiency |
90% |
PV2 |
Aproximately 90% to 95% is typical for lead acid batteries. This depends strongly on the charging regime used. |
| Selected
module |
Solarex 77W |
PV3 |
From module
specification sheet |
| Nominal module power |
77 W |
PV4 |
From module
specification sheet |
| Nominal module voltage |
12 Vdc |
PV5 |
From module
specification sheet |
| Module short circuit current |
4.9Ams |
PV6 |
From module
specification sheet |
| Selected
module I at 14V at NOCT |
4.5 Amp |
PV7 |
From panel
specification sheet |
| Manufacturers tolerance on current output |
5% |
PV8 |
From module specification sheet AS4509.2 clause 3.4.3.6 |
| Derating Factor for soiling
tolerances |
95% |
PV9 |
Design decision - depends on site conditions |
| Peak sun hours
at design tilt for design month |
4.7 hrs |
PV10 |
From
Initial design Specification (AUST Solar Rad data) |
| Design Load energy for array sizing (worst month) |
6331 Wh |
PV11 |
=M4 - D3 |
| Design Load Ah |
131.9 Ah |
PV12 |
PV11/M8 |
| Array Output
required per day |
146.5 Ah |
PV13 |
=PV12/PV2 |
| Daily charge output per module |
18.9 Ah |
PV14 |
(1-PV8) x PV7 x PV9 x PV10 |
| Number of parallel strings required |
8 |
PV15 |
PV13/PV14 |
| Number of parallel strings used |
4 |
PV16 |
Chosen based on other months and existing modules to be used |
| Nominal Solar Fraction for design month |
50% |
PV17 |
Solar fractions of approximately 90% or above, should be treated with some caution. |
| Number of series modules per string |
4 |
PV18 |
M8/PV5 |
| Total number of modules in array |
16 |
PV19 |
=PV16 x PV18 |
| Regulator current rating required |
24.5 A |
PV20 |
=PV6 x PV16 x 1.25 - clause 3.4.8.2 |
| Selected regulator |
PL40 |
PV21 |
Large arrays may need to be split into sub-arrays. Considerations are: (a) availability of high current regulators (b) improved fault tolerance; and (c) more staged battery charging |
| Regulator current rating |
40 A |
PV22 |
From manufacturer's specifications |
| Number of regulators/sub-arrays required |
1 |
PV23 |
PV20/PV22 rounded up |
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| Wind Turbine Estimated Contribution |
|
|
|
| Model: Westwind 3kW |
3000 W |
D1 |
Specification sheet |
| Estimated Contribution |
1000 Wh |
D3 |
Based on design month |
| Conversion to Ah |
20Ah |
D4 |
D3/A2 |
| Note:
Hybrid system with diesel generator backup case |
