Designed and manufactured in Australia, for Australia

Our IP range has been expanded by the inclusion of Australian made products. This was after realising the need to support and utilise local based companies whilst expanding our range to suit customers demands.

weatherproof aluminum Australian made data rack

We saw benefits to us manufacturing these custom-built racks with the main being the very quick turnaround time.  Our local manufacturers standard production time is 1.5 weeks + shipping. Fortunately shipping time is minimal being Australia to Australia (1 week maximum), as opposed to overseas produced products having at least a 3 month wait. This then allowed us to offer customers stock quicker and faster.

Our Australia made and designed IP racks are made with powder coated marine grade aluminum, other features that come standard on our CA racks are:

  • Compatible with all 19” rack equipment
  • Polyurethane gasket on front door for reliable seal
  • Secure doors with 3-point locking system
  • Wall / pole mountable or floor standing
  • 2 x cable entry gland plates
  • Provision for fans and air vents
  • Adjustable 19 inch uprights
  • IP 66 rated

Weatherproof rack and available accessories

Options for our CA range include:

  • Fans
  • Air vents
  • Pole clamps
  • Plinth (standard for
  • 18RU and higher)
  • Custom colours (examples of custom matte grey data rack below)


If you have any enquiries about a custom built rack please fill out this form and one of our friendly staff will get back to you

UPS Topology – Line interactive vs Online double conversion

There are two main UPS topologies, line interactive and online double conversion. We are going to explain these and assist you to select which one would be best for your application.

This information is broken down into two parts; the layman definition, written by myself (I have a marketing and sales, non-technical background) and a technical definition, which we will be explained by our technical manager.

Layman definition

Line-interactive, the load is always running off the mains power, when the power is cut there is a short change-over time to the batteries (approx. 6ms) Line-interactive the power always go through and AVR and Surge protection before the load, thus the power is still being “cleaned”.

Online, the load is always running off the batteries, so we always have a controlled frequency (50Hz) and AC output (230V AC). There is no change over time with online for it is already on the batteries.

Overall, short change over does not affect most equipment (CCTV, basic computer equipment) , however online UPS is preferred for more expensive and sensitive equipment like servers and medical scanners.

Below is a diagram to demonstrate the difference between how a line interactive UPS “cleans the power” vs and online UPS. Please note if you are after a more technical diagram we do have this below.

comical description of line interactive vs online topology

Technical definition

Line-Interactive, during normal operation the mains supply is fed via an automatic voltage regulator (AVR) to feed the load. The AVR regulates the mains supply voltage, boosting if low or bucking if high. The mains supply is used to charge the batteries. When the AC goes out of the specified range, the load is switched to the inverter that draws its power from the batteries.

Online double conversion, converts the power twice, so during normal operation the mains supply is converted from AC to DC, the DC is then converted to AC that feeds the load. When the mains supply goes out of a specified range, there is no switching, and the UPS simply draws its power from the batteries.

image explaining line interactive vs online topology

Topology Comparison

 Line InteractiveOnline Double Conversion
Normal OperationAVR supplies LoadInverter supplies load
Total Cost of OwnershipLower initial cost & Lower operating costHigher initial cost                  & Higher operating cost                          (Energy & Heat generation)
Energy Efficiency during Normal Operation96% – 98%85% – 95%
Response to unstable or highly distorted mains supplyExtreme voltage distortion can require frequent battery usageAccepts extreme voltage distortion without going to battery
Output Frequency regulationOutput frequency varies within a rangeOutput fixed to a configurable frequency


If you require any further assistance in selecting the correct UPS for your application, please contact one of our technicians 1300882447 or

Introducing our Air Conditioners for Commercial Data Cabinets.

Recognising a gap in our range of accessories for the Redback Rack, we have introduced commercial air conditioners.  This is a refrigeration product created for specialised use in communication cabinets.

The AC units are useful in applications where the environments cabinet internal temperature is above recommended operational temperature for sensitive electronic equipment. Examples of applications our aircons have been used include:

  • Rural UPS and battery cabinets
  • Server cabinets
  • Communication cabinets
  • Mine sites

Below is an example of one of our Redback Racks in the Pilbara WA, fitted with a 600W Redback Aircon. This example shows the external temperature at 46 degrees and the equipment internally maintaining a consistent temperature of 21 degrees.

outdoor rack with commercial aircon

The AC units are available in a range of different sizes, from 500watts to 5000watts. The size aircon required will depend on the application, considering variables such as the size of the data rack, heat produced by the equipment that you are storing, does the rack have a sunshield and environmental factors. If you need help selecting an aircon please call or email one of our friendly technical team and we will be able to assist.

Other features and advantages of the aircons are:

      • High reliability
      • High efficiency
      • Powerful cooling abilities
      • Adjustable perimeter settings
      • Emergency fan outputs
      • Self-inspection
      • Simple interface for better user experience

For more specifications, diagrams and information please review our PDF. (click here)

Why should you mount your equipment vertically in a data rack?

When selecting a data rack, once you know what size you need in terms of depth and RU, you have the option to mount your equipment horizontally or vertically.

Redback Racks have designed a series of specialty racks where you are able to mount your equipment vertically.



What are the advantages of mounting your equipment vertically?

Mounting your equipment vertically creates a smaller footprint, allowing the rack to fit into smaller more compact spaces.

Other features of our enclosed vertical racks VM.6904 and VM.6606 include:

  • Solid door and secure key –providing greater security
  • Cable entry (rear and top)
  • Earth studs
  • Cage nuts
  • Space to mount fans for ventilation
  • Holds up to 40kg

For more information on each of our vertical racks click the product code:

  • VM.6904 – 4RU 800mm deep (vertical) and 2RU 150mm (horizontal mounting)
  • VM.6606 – 6RU 450mm deep
  • BRV – Vertical brackets that can hold 2RU, 3RU or 4RU

Does your vaccine fridge have a protocol in place for a power failure? 

Vaccine fridges are critical in maintaining the optimum temperature to keep vaccines safe for use. In line with all government policies and procedures a plan is needed to maintain these temperatures in the event of a power failure.

PSS Distributors have been providing UPS (uninterruptable power supplies) in the medical industry for over 25 years.

We have a full team of technical experts nationwide to assist with selecting the correct as well as nationwide distribution and quick delivery times.

Features of our Medi-X unit:

  • Provide immediate back up in the event of a power failure
  • Plug and play design, no sparky needed to connect
  • Can customise the unit and make to specifications, achieving up to 24 hours run time
  • 98% efficient while mains is present
  • Fast battery recharge time
  • Wall mountable or floor standing
  • Automatic voltage regulation with surge protection

For further information and pricing please call 1300 882 447 or email

Why is lithium-ion all the rage at the moment and is it worth it?

Why is lithium-ion all the rage at the moment and is it worth it?

If you’re new to batteries, or not so new but need some refreshing, let’s start with the batteries available and their advantages and disadvantages.

Looking at four types of UPS batteries:

  • Sealed Lead-Acid (SLA) / Valve Regulated Lead-Acid (VRLA)
  • Advanced Lead-Carbon (ALC)
  • Nickel-Cadmium (Ni-Cd)
  • Lithium Iron Phosphate (LiFePO4) 

Sealed Lead-Acid UPS Batteries 

These are the most common battery used when it comes to UPS systems. Over time they have shown to be reliable and the most cost-effective option. We commonly use sealed lead acid batteries which are also able to be moved and stored vertically or horizontally which suits various applications.

Cons of SLA batteries are their weight and size, so they are great in applications where size and weight are not an issue. 

Advanced Lead-Carbon UPS Batteries 

The accumulation of lead sulphate within a Sealed Lead-Acid battery due to partial charge and aging is often the cause of failure. Advanced lead-carbon (ALC) solves this by adding carbon to the negative plate and improving charge and discharge performance.

ALC batteries have the same cons with their weight and size. 

Nickel-Cadmium UPS Batteries  

This option used to be very popular and although they are used in some applications, they are no longer commonly used in UPS systems.

Advantages to Nickel-Cadmium batteries is the 20-years design life and the vast temperature range the batteries can operate in.

Cons of these batteries are the costs associated with the initial purchase and in disposing and recycling due to nickel and cadmium being toxic materials. 

Lithium Iron Phosphate UPS Batteries 

These batteries have been used for a number years in other devices and recently there has been a demand for lithium-ion in a UPS application. Advantages of Lithium-Ion batteries include their energy density, lighter weight, design life and the ability to charge more efficiently and in less time.

Cons of this option would be the cost, despite decrease costs recently they are still significantly more expensive than the VRLA option. Much like the Nickel-Cadmium batteries, there is a cost associated with disposal. There are issues with regards to transportation of Lithium Iron Phosphate batteries which could also have a significant impact on the disposal costs.

Overall, is it worth it?

That would depend on the individual application that is required, if weight and size are an issue and there is a larger budget available, they could be a viable option.

We have a large range of our UPS solutions that are compatible with lithium-ion batteries, for more information please contact us.

What is the Difference Between Square Wave and Pure Sine Wave Inverters?

What is the Difference Between Square Wave and Pure Sine Wave Inverters?

“Do you want get a Sine Wave Inverter or Square Wave Inverter?”

Perhaps, this is one of the most common questions you’ll get when you try to purchase a power inverter. So what’s an inverter anyway? The majority of household electrical appliances use an Alternating Current (AC) electricity. On the other hand, a battery stores Direct Current (DC) electricity. The main purpose of an inverter is to convert the DC electricity into AC electricity.

But when it comes to the basis of its circuits, an inverter converts DC current to either Square wave AC current or Sine wave AC current. The Sine wave inverter output is very similar to the AC current. In comparison with the Square wave output, the Sine wave output is purer; that’s also the reason why the term Pure Sine wave inverter exists.

To give you an idea of how the two currents look like, refer to the photo below:

One more important thing that you need to know is many household devices get heated up if you’ll use Square wave inverters. This is the reason why Square wave inverters are banned in some European countries. Other than that, we outlined a comparison chart between Sine wave inverters and Square wave inverters below to help you differentiate them better.

Comparison Chart: Square Wave Inverter vs. Sine Wave Inverter

List of FeaturesSquare Wave InverterSine Wave Inverter


Supported Appliances


Square wave inverters are usually used to support motors alone.

Sine wave inverters are used to support household appliances such as refrigerators ovens, computers, laptops, etc.

Overall Safety Level

Square wave inverters are less reliable and also unsafe to use for appliances.Sine inverters are highly safe to use.

Noise Interference

Square wave inverters produce a very loud noise when used.Sine wave inverters produce normal sound only.


Square wave inverters are less expensive than Sine wave inverters.Sine wave inverters are more expensive than Square wave inverters.

Furthermore, there’s another type of inverter that you can take advantage of. This one is called “Modified Sine Wave Inverter.” This type of inverter is better than the Square wave inverter and more affordable than the Sine wave inverter. A Modified Sine Converter can be utilised for simple systems, however, there are heaps of equipment that it cannot support. Some of these are the following:

  • Medical equipment (e.g. oxygen concentrators).
  • Some laptop computers.
  • Home Automation Systems.
  • Anything that has Silicon-controlled Rectifier (SCR).
  • Laser Printers.
  • Photocopiers.
  • Appliances with microprocessor controls.

If you are planning to purchase a Modified Sine wave inverter, it is highly recommended to go for the Sine wave inverter instead. As modern technology continues to rise, the cost of pure sine wave inverters is dramatically decreasing, making them more affordable and accessible in the global market.

Are you needing of a UPS and an inverter to support your equipment? At PSS Distributors, we are offering high-quality equipment and installation.

For sizing and costing, please visit our UPS calculator to see the best UPS for your needs

Why PSS Distributors?

To ensure you are choosing the right partnership for your next UPS project – you want a company that has proven themselves time and again and one who has previous experience with similar jobs, superior technical expertise and can offer the after sales support that you require.

So, Why PSS Distributors…

PSS Distributors has manufactured our own units since 1994, We have over 100 000 units in the market at present in 2 continents. Our technical expertise to design and manufacture the more difficult solutions has held us in good stead for 25 years.

A few of our more recognisable sites include:

  1. Toshiba CAT scans nation wide
  2. Avis Car Hire (2 x 60KVA)
  3. DHL (1 x 80KVA)
  4. BOC gases (1x 80KVA)
  5. Bunnings Warehouse (2000 x 600VA )
  6. NSW health
  7. Bosch
  8. Abbott Labs

We have designed and manufactured security power supply systems and have become the largest security power supply distributor in Australia, which include:

  1. Wall mount 4-24A in 12 and 24VDC
  2. Wall mount 4-25A in 24VAC
  3. Rack mount in DC and AC
  4. Battery backed up units

With over 40 years experience in power, innovative engineers, we have achieved what other UPS companies have turned away from, for example:

  1. Controlling a UPS to run on static switch to overcome large inrush currents and transferring back to inverter remotely when given the signal (CAT scans)
  2. Designing UPS with sleep mode to operate weeks after a power failure when needed (roller shutter doors)
  3. Manufacturing cost effective UPS systems with small inverters but large charges for very long battery back up (security cameras / telecommunications)
  4. Arranging UPS systems that convert single phase to 3 phase (lathes, power tools in workshops etc)
  5. Dedicated UPS systems to keep pumps on vaccine fridges running for hours.

How Long Does a UPS Battery Last For? 

“Well, how long is a piece of string?”

How long a battery will last for is the most frequently asked question by customers who are planning to purchase an Uninterruptible Power Supply (UPS) and there are many variables to consider.

The batteries we will be referring to is our standard sealed lead-acid UPS battery that comes with our UPS systems. 

Unlike the typical alkaline batteries, the life a UPS battery depends on impacting factors such as environmental conditions, maintenance, and the number of discharge cycles.

The standard life of a UPS battery is three to five years, this is referred as 5-year design life. The design life has been calculated in a controlled lab environment and doesn’t consider adjusting environmental factors. These factors that will affect the life of your battery include:


  1. Room Temperature

Temperature can alter the performance of a UPS battery and can potentially shorten its expected life span. The optimum temperature to store and utilise a UPS battery  is 21°C – 25°C, moving out of this range will influence its batteries life span. The maximum temperature to store and operate a UPS battery in is 40°C.

One of the common causes of over temperature is inadequate ventilation around the UPS. If you are unable to store your UPS in a room with adequate ventilation, we recommend keeping the UPS in a data rack with fans.


  1. Regular Maintenance

No matter how well-kept your batteries are, they still need to undergo proper maintenance. Neglecting maintenance may cause your UPS batteries to experience improper loading, heat-generating resistance at the terminals, loose connections, premature failure, and reduced protection. We have all our maintenance options available here.


  1. Cycling

During a power outage the UPS will operate using its own battery power. Once mains power is restored to the UPS, the battery will then get recharged for future use. This process is called a discharge cycle. When the UPS was first installed, the battery’s rated capacity is at a hundred percent. However, each discharge cycle reduces the relative capacity of the battery by a small percentage.


  1. Battery Chemistry

Unfortunately, UPS batteries are electrochemical devices and are not designed to last a lifetime. Even if your UPS batteries are well-maintained and meet the specific standards for proper storage, your batteries will eventually still run out of power.


  1. Standard Shelf life

Keeping the above in mind it is always important to consider how long the UPS has been sitting on the shelf since being manufactured, as this would reduce how long the UPS is viable once being used by you. At PSS, we combat this issue by only keeping batteries in our fast-moving products, we source and supply batteries specific to the order on hand for all our larger UPS (3kva and above).

In summary, to get the maximum life span out of your sealed lead acid batteries, it is recommended to follow the above. If you’re currently planning to replace your UPS batteries with new ones, we can service and maintain a wide range of UPS.





Why Do You Need A UPS for Your CCTV Cameras

Why Do You Need An Uninterruptible Power Supply (UPS) For Your CCTV Cameras

In the present day, numerous homes and businesses are investing in CCTV cameras for protection and security. As we may know, installing a CCTV camera is an excellent way to maintain the overall safety of a home or a business establishment’s perimeters. CCTV cameras are also beneficial when it comes to monitoring your premises when you’re away. 

UPS and CCTV Cameras

Since CCTV cameras need a constant supply of power to function efficiently, installing an Uninterruptible Power Supply (UPS) is an integral factor of a functioning CCTV system. A UPS can provide a consistent amount of power to the CCTV system, especially in the event of an unexpected power outage.

There are other benefits that UPS can provide for your security cameras, such as:

  • Automatic Voltage regulator
  • Surge protection
  • Option to notify you if the power has been cut (added security)
  • Continuous and uninterrupted monitoring

If you’re looking to install a UPS, PSS Distributors can take care of your UPS installation. We guarantee that no matter how small or big the installation is, we will provide each project with proper planning, professional technology, and relevant skills to ensure reliable power protection.

For sizing and costing please visit our UPS calculator to see the best UPS for your security needs-



Congratulations Team PSS

PSS has been selected as a Small Business Champion Finalist from over 2,000 entries received this year.

This achievement is a testament to the vision, planning and hard work invested in this business to deliver spectacular results. Congratulations Team PSS.


Discarded electronic equipment is one of the fastest growing waste products today due to the increasingly large usage of these products. This needs to be monitored responsibly and methods used such as effective collection, reuse and recycling. Each person using these products can also make the right and responsible decision for discarding their equipment.

Electronic equipment waste contains hazardous material which is harmful to the environment and human health and this waste is growing three times faster than general municipal waste.

Governments and organisations are working closer with such projects.

At PSS – we take discarding of our old electronic items and batteries very seriously and ensure our methods comply with safety standards.

We strip out units and recycle the parts. We also offer a service to our customers whereby we discard their old batteries for them.

Please call us on 130088447 for assistance or information.

Importance of servicing UPS

Although most of the modern units test batteries periodically, if is always good to power the UPS every 6 months.

This is done by switching the power off to the UPS and monitoring DC voltage. Once the batteries reach 20% capacity, re-instating power. This cycles the battery, prolonging their service life.

If the batteries do not perform to specification, they should be replaced by a qualified service technician and old batteries disposed of correctly.

The 5 biggest mistakes made when ordering a UPS

The 5 biggest mistakes made when ordering a UPS

1.       Not knowing their load- If the load is not known, it’s like buying a Ute and not knowing what payload needs to be carried

2.       Not knowing what battery time is needed- this is determined by the load requirements

3.       What format and weight of UPS- UPS com in rack mounted or floor standing units and are primarily manufactured from copper and lead.

4.       Power to supply UPS- in most cases when one big UPS needs to supply critical equipment, the load needs to come from one adequate supply.

5.       No budget set aside for electrical work- When supplying a UPS that cannot be plugged into a 10A GPO, the UPS need to be wired in by a qualified electrician.

Our handy UPS calculator addresses most of the above questions making it an extremely useful tool when buying a UPS.

What’s an IP rating?

IP (or “Ingress Protection”) ratings are defined in international standards. They are used to define levels of sealing effectiveness of electrical enclosures against intrusion from foreign bodies (tools, dirt etc.) and moisture.”

Should UPS ever be switched off?

No, the only time UPS should be switched off is when the load on the UPS has been removed. This can be done in the following conditions:

  1. The load has been transferred to another source
  2. In a parallel redundant system, when the redundant unit can accept full load
  3. The load is switched off entirely.

Therefore it is essential to maintain and test the UPS and batteries during scheduled times that is convenient to all parties.

Advantages of service contracts

From research carried out by various UPS companies, it has been shown that the chance of UPS failure is nearly four times greater when the unit is not regularly checked and serviced.

PSS Maintenance contracts include two site visits per year where PSS technicians will check the condition of the UPS and advise if any issues. We will test batteries, run discharge tests to establish battery life, check operating parameters as well as perform any required adjustments.

Our all-inclusive service contracts are designed to offer 24 x 7 peace of mind protection for our customers; we will take ownership of all UPS related matters and deal with them promptly.