Selectronic Australia

Selectronic SA21 Inverter

Selectronic SA21 Inverter
Features | Specifications

The SA21 inverter is discontinued as of November 23, 1999.

The SA21 information below is for reference only.


The SA21 can be used on either 12 or 24V battery banks. Just imagine, you can upgrade your 12V system to 24V without changing inverters. To allow you to customise your remote power system, all important parameters of the SA21 are adjustable via either the inverter front panel or the optional remote keypad.

Designed for small to medium sized remote power systems, the SA21 has enough continous power to run most household appliances, and plenty of surge to start hungry motors.

Demand Start
In standby mode the SA21 will turn on and off with any type of load, simply adjust the sensitivity to start the smallest load or overcome a phantom load. This feature will save you valuable battery power and may be overridden if necessary.

High & Low DC Voltage Cut Out
The SA21 has a fully adjustable low voltage and high voltage cut out. Also a low voltage disconnect option can be selected to fully protect your batteries.

Safety & Reliability
Totally protected against thermal overload, current overload and AC short circuit. The SA21 output is electrically isolated for your safety, and is M.E.N. compatible. The on board computer monitors all operating parameters within the SA21 to ensure trouble free operation. However, should service be required the modular construction allows for quick and easy on-site repairs by any authorised person.

Energy Management

Optional Extras
SA-KP-01 Remote Keypad, SA-SB-01 Output Interface, SA-S200 Current Shunt.




12V Input

24V Input


Output Power
@ 25 deg C Ambient
Max Continuous
1/2 Hour Rating
Max Surge
Output Power
@ 40 deg C Ambient
Max Continuous
1/2 Hour Rating
Max Surge
Voltage Input Range 10-17V DC 20-34V DC Operating Range
Input Current 75mA DC
90mA DC
0.65A DC
120A DC
150A DC
360A DC
60mA DC
70mA DC
0.75A DC
60A DC
75A DC
180A DC
Stand By
Stand By w/ Optional Key Pad
Inverter ON - No Load
Max Continuous
1/2 Hour Rating
Max Surge
Demand Start Sensitivity
Response Time
1 Second Max
User Adjustable
Low Voltage Disconnect
Low Voltage Shutdown
8.5V DC
9.5 - 11V DC
17V DC
19 - 22V DC
Delayed, User Adjustable
High Voltage Disconnect
High Voltage Shutdown
18.0V DC
15 - 17V DC
35V DC
30 - 34V DC
User Adjustable Max
Output Voltage Adjustable from 220 to 240V AC +/- 4% @ Nominal DC Input,
No Load to Full Load
Output Current 5.0A AC
15.0A AC
Max Continuous
Max Surge
Output Wave Shape
Output Frequency
Total Harmonic Distortion
True Sine Wave
50Hz +/- .001%
< 4%     
Power Factor Limitations Nil
Input/Output Isolation Yes
Max Nett DC
Current Measurement
400A DC peak, 200A DC cont.
100A DC cont.
Max Remote Keypad Cable Length 500 Metres      
Control Output 2 off @ 50mA Max Each
User Inputs 2 x N/O or N/C Contacts
Memory Retention Time Permanent
Operating Temp Range -10 deg C to + 40 deg C
Conforms to Standards AS3100-1990 (wiring)
AS/NZS1044-1992 (RFI)


Size 428mm wide x 170mm high x 370mm deep
Weight 17.5kg
Weight Packed 20kg
Input Lead Length 1.6 metres with 10mm mounting lug.
Output Wiring Method Rear three terminal junction box with conduit knock outs.
Output Socket Dual switched 3 pin GPO with neon indicators.
Chassis Powder coated zinc steel
DC Isolation Single Pole Circuit Breaker
Warranty Lifetime Parts and Labour * Conditions Apply

Through a policy of continued development, specifications or sizes quoted are subject to change without notice. Note: All power ratings are at 1.0 Power Factor.

WARNING - All Remote Power System installations must comply with the relevant requirements of your state or national standards. It is imperative that only Registered Electrical Contractors are permitted to install or check any appliance or wiring in your installation.