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FAQ Transformer based Inverters

Detailed  Demonstration videos below.


See our handy guide - How to choose the right Inverter

  1. Calculate the total load
  2. Choose the correct voltage rating
  3. Choose the correct size of inverter based on your output load rating
Step 1: Calculate the total load

 The main factor that determines the size of your inverter is the total load connected. The total load can be worked out in wa tts by summing up individual power consumption of all your appliances.

 (If you have a TV (200w), fridge (300w) and a fan(600w), your total power consumption will be 200+300+600 = 1100w). This is the continuous load rating. Motors require approximately about 25% more than their rated power (to meet the in -rush).


Step 2: Choose your battery bank voltage

 Batteries that are connected in series will increase the voltage capacity whereas batteries that are connected in parallel increase the current capacity. Batteries are rated on voltage and AH(Amp-hour capacity). The AH capacity gives you an approximate idea of the time you can power your load.

 2 x 12V batteries rated 200AH connected in series to give 24V will have an AH capacity of 200AH

2x12V batteries rated 200AH connected in parallel to give 12V will have an AH capacity of 400AH

(A 200AH battery with a C10 rating can supply 20A of current for 10hours. A 200AH battery with a C24 rating can supply 8.3A

for 24 hours).

If you want to supply a load that consists of a TV (200w), fridge (300w) and a fan (600w) for 6 hours. You would need a batte ry of 550AH at 24V.

It is important to use the correct sized battery for specific applications (An inverter is not a free energy machine, all it does is convert DC (Direct Current) power from the battery into alternating current for your appliances.

Step 3: Keep the length of the DC cables short / Increase their diameter

 It is important to note that the resistance of a DC cable is dependent on the length and the cross sectional area. The longer the cables, the higher its resistance will be. The resistance will also be high with reduction in cross sectional area. This is o f very high importance and might be the deciding factor in powering your load for extended periods of time.

 Tortech inverters come with a low voltage shut down of 10.5VDC/11VDC (adjustable for a 12VDC inverter), 21VDC/22VDC (adjustable for a 24VDC inverter, 42VDC/44VDC(adjustable for a 48VDC inverter). If the DC cables are too long or too thin, th is will result in a significant voltage drop due to the resistance which might cause the inverter to see lesser voltages at its terminals (significantly lesser than the battery voltage). This will inturn result in the inverter shutting down improperly.

 Once these three factors are accounted for in the planning of your inverter system, you should face very little problems.


What is the utility/battery priority mode? (see images below)

 Tortech inverters come with an advanced micro-processor controlled utility/battery priority feature. This feature helps the user select the option of supplying the load from the battery* or from an AC source (generator/utility). The generator is

programmed smart to give more priority to the AC source by default. This is done to increase the longevity of the battery.

 Switch number 4 when in position 1 will give priority to the battery to supply the load. This is very useful when trying to reduce power consumption from the utility and maximise the extraction of PV power stored in the battery. (see image settings below)

 Switch number 4 is set to position 1 before connecting the DC input from the battery and the AC input from the generator or the utility. The inverter is turned on with AC input off.  (see image settings below)

When the AC input is turned on after this condition, It will supply load from the battery till the battery runs low on charge , It will automatically switch to the AC input and charge the batteries simultaneously once the battery runs low on charge.

In the same way, if the switch is set to position 0, it will give priority to the AC input to supply the load. Use this setting if

you want to use power from the generator/Utility and conserve the battery.


 What is the Auto-generator start feature?

 Auto-generator start feature is applicable to users who want to auto-mate the battery charging process.

The inverter monitors the battery voltage and once it hits a low voltage value of (11V/22V/44V) the inverter shorts the relay and automatically starts the generator*. The inverter will automatically give priority then to the battery to supply the load (switch 4 in position 1) and the cycle repeats.

See attached wiring diagram to the generator from the inverter. 

 Does the inverter have output 240v sockets?

 Tortech inverters rated 3000-9000W Surge, 1000-3000W continuous come with two flush mounted approved Australian sockets. An additional hard-wired terminal block is present for AC input, AC output.

Does the inverter have adequate protection?

 Tortes inverters come protected with an AC output circuit breaker for 240V and an AC input circuit breaker for the built in charger.

 Why are Tortech inverters better (what is the THD)?

 Tortech inverters are designed low THD of 5% in contrast to 20% from most competitors. This means that only 5% of the power is not available at the fundamental frequency. With 20% THD, there is 20% of the power that is not present at the fundamental frequency. This means that a 5% THD inverter is much more efficient than an inverter with THD of 20%.

5.5 THD inverter 9.5 THD 22.5 THD  
 5% THD         9.5% THD 22.4% THD

In laymen terms, a 5% THD inverter (Tortech) will result in better performance of your load device in comparison to a 20%THD inverter. This is very important when powering reactive loads, an inverter producing high THD will result in a very high current draw.

Please Browse from our Inverter Video FAQs:

The Tortech TXF Inverter at resistive load   The Tortech TXF power Inverter in use with appliances


Difference between Electronic & Transformer based Inverter


Vibration testing

Benefits of low Total harmonic distortion of Transformer based Inverters  


DC power to 3 phase power conversion


LED Indicators :

Power Saver Mode Setting

  Charging Mode Active

Inverter Mode Active

 Priority Mode Setting

Power saver mode setting



Comparison FAQ - Tortech TXF inverters vs other market:

Components/ functionality

Tortech Pure Sinewave Inverter

Our Competitors’ design


Our Advantages:

Adopting more efficient “UI type” transformer for the 4-6KW models.

88% peak DC to AC efficiency, and ultra low idle consumption.

80W idle consumption for 6KW inverters.


Adopting two lossy “EI type” transformers for the 4-6KW models.

High low idle consumption.

Around 150W-240W idle consumption for 6KW inverters.

DIP Switch


Our Advantages:

1 Offers customized performance on power sensing cycle, input AC voltage range and low battery trip point.

2 Better generator compliatility with wider AC input range.

For more details, pls refer to our manual.




The specs are all preset in the factory, users have no option to change it to suit their specific electrical systems.

AC/Battery priority selector

Our Advantages:

1 Offers flexibility to set the inverter to either AC priority mode or battery priority in different power systems. For example, in renewable systems, battery priority is preferred.

2 The charging algorithm will also change in battery priority mode to conserve AC input power.

For more details, pls refer to our manual.




The inverters are set in AC priority be default and don’t work well in renewable systems.

Auto Generator Start

Our Advantages:

Auto Generator Start for back up electrical generators in renewable system.

This terminal can also be connected to external alarm devices to give alarm when battery voltage goes low.



Charge Current Control

Our Advantages:

The charging current can be regulated to different ratings for a wide range of battery banks.




Battery bank capacity has to be specially configurated to suit the charger rating.

Remote LCD control panel

Our Advantages:

Remote LCD control panel with system status at a glance.

Generally Unavailable

DC to AC Switch delay

Our Advantages:

15 secs switch delay from battery to input AC, this avoids frequent switches and leaves time for generator to spin up

Generally Unavailable

AC Voltage Regulation

Our Advantages:

We offer optional Voltage Regulation to regulate the input voltage from 154-276Vac/78-144Vac to an output voltage of 230V/120V±10% .

Generally Unavailable

DC Terminal

Our Advantages:

1 Metal screw holes for greatly extended lifespan than plastic ones

2 Strengthened metal base and bolt with enhanced torque rate of 23 NM

3 Higher plastic flammability of 94V-0.


Easy wear of plastic screws holes after a few times or over torque.

Low plastic flammability.

Grounding Terminal

Our Advantages:

Larger size, improved conductivity with maximum conductivity to 40A, UL 458 compliant.


Low conductivity of 10Amps.

The terminal may unable to conduct all the current when a short circuit occurs, endangering the users.


 Wiring Diagrams