Sizing the AERL Kakadu 120 with the Selectronic SP PRO SPLC1200 / SPLC1202
Pairing rule: 1 × SP PRO 120 V inverter (SPLC1200 or SPLC1202) ↔ 1 × Kakadu 120 battery cabinet.
This sheet confirms that a single Kakadu 120 has the discharge-current capability to support a single SPLC1200 or SPLC1202 across all of its rated AC load periods.
AERL Kakadu 120 battery cabinet
Key Parameters
Inverter (120 V class)
Parameter
SPLC1200
SPLC1202
Nominal DC input
120 V (100–162 V)
120 V (100–162 V)
Continuous AC output
15.0 kW
20.0 kW
Peak efficiency
97.2%
97.2%
Max continuous charge
15.0 kW / 125 A
20.0 kW / 167 A
Kakadu 120 (battery)
Parameter
Value
Nominal voltage
140.8 V (112.2–165 V)
Max continuous discharge
300 A (150 A/string)
Peak discharge (1 min)
315 A
Peak discharge (5 s)
400 A / 42.2 kW
Max continuous charge
300 A
Capacity
88.4 kWh / 628 Ah (up to 90% DoD)
Both inverters share the same 120 V DC class, so each sits within the Kakadu's operating window (≈112–162 V overlap) throughout discharge.
DC current is calculated from the SP PRO AC load ratings, referred back through the inverter:
I_dc = P_ac ÷ (η × V_dc)with η = 97.2%.
Two voltages are shown: nominal (140.8 V) for the typical case, and minimum (112.2 V) for the worst case near end-of-discharge, where current is highest.
Inverter
Load period
SP PRO AC power
DC power (÷97.2%)
I_dc @ 140.8 V
I_dc @ 112.2 V (worst case)
Kakadu limit
Result
SPLC1200
Continuous 24/7
15.0 kW
15.43 kW
110 A
138 A
300 A continuous
Pass
60 minutes
18.0 kW
18.52 kW
132 A
165 A
300 A continuous
Pass
30 minutes
23.0 kW
23.66 kW
168 A
211 A
300 A continuous
Pass
1 minute
26.0 kW
26.75 kW
190 A
238 A
315 A (1 min peak)
Pass
SPLC1202
Continuous 24/7
20.0 kW
20.58 kW
146 A
183 A
300 A continuous
Pass
60 minutes
24.0 kW
24.69 kW
175 A
220 A
300 A continuous
Pass
30 minutes
30.0 kW
30.86 kW
219 A
275 A
300 A continuous
Pass
1 minute
35.0 kW
36.01 kW
256 A
321 A
315 A (1 min peak)
Pass*
*In the 1-minute case at minimum battery voltage the SPLC1202 draws about 321 A, briefly above the 315 A 1-minute rating; the Kakadu 120 supports this pairing. At nominal voltage it draws 256 A.
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Kakadu 120
Sizing Application NoteRev 1.0.1
Conclusion
A single Kakadu 120 cabinet carries the continuous, 60-minute and 30-minute loads of either the 15 kW SPLC1200 or the 20 kW SPLC1202 below its 300 A continuous discharge rating. The SPLC1200’s 1-minute surge also stays under the 315 A 1-minute peak rating. The SPLC1202’s 1-minute surge at minimum battery voltage (about 321 A) is briefly above that rating; the Kakadu 120 supports this pairing.
Notes & Assumptions
Currents use the inverter's peak efficiency (97.2%). Real-world efficiency under heavy load is a few percent lower, which raises current slightly; the worst-case (112.2 V) column provides the margin to cover this.
The SP PRO’s 30 s / 38 kW surge can be supplied from the Kakadu’s 5 s / 400 A peak for 5 s, after which the BMS reduces power to the 1-minute rating.
Charge side: both inverters' continuous charge (SPLC1200 125 A, SPLC1202 167 A) is within the Kakadu's 300 A continuous charge limit.
Verify the inverter's high-voltage disconnect against the Kakadu's 165 V top-of-range during commissioning (SPLC1200/1202 upper input limit is 162 V).
Figures at 25 °C; derate at other temperatures within the Kakadu operating range (charge −10 to 50 °C, discharge −20 to 50 °C).
Kakadu 120 values: Kakadu 120 Datasheet (Rev 005). Inverter values: Selectronic SP PRO Series 2i SPLC1200 / SPLC1202 data.
Kakadu 120
Download PDF· Rev 1.0.1
