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Solar Inverter Guide

Solar Inverters: The Complete Guide

A fundamental part of every Solar Power setup is the Inverter. It is a piece of equipment that is very important to understand.

After you read this definitive guide, you will understand:

Chapter 1

What is an Inverter?

The basic fundamentals

An Inverter plays a very important role within a Solar Power or Load Shedding Kit.

Simply put, a solar inverter converts DC power (Direct Current) that Solar Panels produce and batteries store into AC power (Alternating Current) that our home appliances use to run.

They also do several other things like tracking your production, and they are responsible for ensuring your system is safe and shutting down if it’s not to prevent damage.

Without one, you can’t use the Solar Power your panels are producing.

There are four main types of Solar Inverters that we’ll go through in this guide:
The Hybrid Inverter, Off-Grid Inverter, Grid-Tied Inverter and 3-Phase Inverter.
Chapter 2

Hybrid Inverters

How do they Work?

The hybrid inverter is the most sought-after inverter on the market today because of its unique abilities. They are a no mess, no fuss, piece of equipment that will help you save money on your electricity bills. Power consumption monitoring is effortless with a Hybrid Solar Inverter and helps you understand how to use your solar system more efficiently.

They function just like any other inverter by converting the solar energy from your Solar Panels or the stored power in your Solar Batteries from DC to AC power but with added features that are unparalleled.


New Technology

New Technology
Hybrids  blend power from all available power sources . This means they will use all of the available solar power generated from your array. If your needs exceed the produced solar power, the excess will be supplemented with either your battery backup, grid, or both. Ensuring your home is always powered and you are  always using freely produced or stored solar power first .

Multiple MPPT Inputs

MPPT Inputs
Most Hybrids come with  two or more MPPT inputs  and a  high voltage range , allowing you to have a more extensive array. In addition, you can  split your array  so that you have two arrays that function independently. Separate arrays mean that should one fail, you still have another fully functioning array.


Hybrid Scalable
They can be paralleled, which is an excellent feature if you plan on scaling up in the future. They communicate with most Lithium-ion Batteries, and most Li-ion batteries are parallalable too. Above all, If you need a  system that can grow with you , this is most definitely the inverter to go for.


Hybrid Felxible
Another great feature of the Hybrid Inverter is the ability to  power non-essential loads  should your solar power production exceed the needs of your essential load. To clarify, this means that any  extra solar power produced can then be used for your non-essential appliances .

Hybrids offer so much more than the inverters that came before them. Blending all available power sources and real-time monitoring has increased the efficiency of solar power systems that have them and decreased the constant need for grid supply.

The added ability to power your non-essential load during the day with excess solar power will ensure that you save money on grid-supplied electricity.

The Fusion Inverters are the best inverter for home and business use. We highly recommend these.


  • Efficient
  • Easy to install
  • Blends AC/DC Energy
  • Long-lasting (around 15 years)


  • More expensive
Chapter 3

Off-Grid Inverters

The inverter that brought everything together


  • Easy to install
  • Expandable
  • High or low voltage options
  • Lowest solar inverter price

A very  popular choice because of their price , compared to previous Off-Grid inverters, they are far easier to install due to the fact you have everything in one box instead of separate components.

However, in previous years, they were just a metal box with only one function: convert DC to AC.

You would need other components like an MPPT (this allows you to connect to solar panels), a Charge Controller (that allows you to connect to batteries), a monitoring device, and a bunch of wiring to tie it all together.


Off-Grid Felxible
 Some Off-Grids can be paralleled  should your demand for more power increase. But, it is essential to remember to do your research and ask questions about how to meet your needs and future plans.

High or Low Voltage

Off-Grid Felxible
You get  2 main types of Off-Grid inverters, and these are Low-voltage and High-voltage . The difference between the two comes down to how many solar panels you can connect. You can find more detail on how that works by reading our guide: How to Size a PV Array.


  • Easy to install
  • Expandable and modular
  • Affordable


  • Less reliable than a Hybrid
  • Lifespan isn’t that great (around ten years)
  • Can be noisy
Chapter 4

Grid-Tied Inverters

Feeding back to the grid


  • Grid connection required
  • Solar Panels required
  • Scalable
  • No batteries

Grid-Tied Inverters require an active grid connection to function. If the grid goes down, you will not be able to use any Solar Power produced. An energy meter must be installed within a Grid-Tied Kit so that should your array not be producing enough solar power, it will supplement the excess with grid power.

Grid-tied kit diagram
Another feature of the Grid-Tied inverter is that you can feed Solar Power back into the grid. However, there are additional charges for this ability including the cost of a bi-directional meter, installation and a daily fixed charge or around R12.
Grid-Tied setups are ideal for homes or businesses that use the majority of their electricity during the day. Supplementing your daily electricity usage with Solar Power will drastically reduce electricity bills.

Grid-Tied systems do not require batteries which brings down the cost of these kits.

Chapter 5

What Size Inverter Do I Need?

Working out what size inverter you’ll need is easy

Here is the formula that we use at SolarAdvice to calculate system sizes for our clients. It will help you work out what inverter size you’ll need and you’ll understand how solar inverter sizing works.

All you’ll need is your average monthly electricity bill and a calculator.

Different size inverters

Step 1

Take your average monthly electricity bill amount and divide that by 2.2 (the average price per kW) Eg:

Monthly Bill


Average Price Per kW


Monthly Usage in Kw


Step 2

Take your monthly usage in kW and divide that by 30 (days in a month)

Monthly Usage in Kw


Days in a Month


Daily Usage in kW


Step 3

Take your daily usage and divide it by 5.5 – the hours in the day that you produce the most.

Daily Usage in kW


Max Production Hours


Production Needs


Inverter Sizing Conclusion

You will need at least a 5kW inverter to cover the 4.96kW

  • 6 x 400W Solar Panels = 48% coverage.
  • 10 x 400W Solar Panels = 81% coverage.
  • 12 x 400W Solar Panels = 97% coverage.

Important Array Sizing Information

In addition to size, you will also need to consider MPPT voltage ranges when selecting an inverter.

Do you need a large array? If the answer is yes, then a high voltage option is best..

If the answer is no, you can look at the low voltage options.

You can read up more on how to size an array here: How to Size a Solar Panel Array
Bonus Section

Inverter Application Questions

These are the questions you should ask yourself before choosing an inverter.

Do you want a Load Shedding Solution or Solar Solution?

If you answered Solar Power, a Hybrid Solution is recommended because it synchronises to the grid allowing you to use all available Solar Power and if you’re not producing enough, it will pull the deficit from the grid and/or batteries.
If you need a setup that will save you power cuts only, either-or will do nicely.

Will you add solar panels later?

Adding Solar later is something that many of our customers do. However, in this instance, it is always a good idea to install a Hybrid Solution because of its blending capabilities mentioned above. Installing a Load Shedding Kit now and installing Solar Panels later, breaks up the cost of the product and installation allowing you more time to prepare financially.

Will you add extra solar panels later?

If you’re wanting to add extra solar panels later, a system with more than 1 MPPT is your best option. Allowing your system to grow with you.

Will you need batteries?

If you’re adding batteries, check to ensure that the equipment you choose has comms. Meaning that the equipment can communicate with each other.

Will you be adding another inverter later?

Some can be paralleled and some can’t. Be sure to check the datasheet or ask one of our sales team.

Do you require a UPS function?

If you’re running life-saving machinery or computers, you’ll definitely want to invest in a system that has UPS capabilities.

Do you have Single Phase or 3 Phase supply?

You can install a single-phase inverter on each phase if you have 3 phase supply. Or, there are 3 phase inverters available on the market.

Chapter 6

How Much Do Inverters Cost?

What to expect

The prices are determined by brand, build quality, features, and size.

For commercial systems with massive kW ratings, you will be paying anywhere from around R50,000 and much higher for even larger inverters.

Whereas residential inverters typically starting from 3kW to a 10kW in size, you can expect the following price ranges:

Off-Grid Inverter

Off-Grid Inverters

Between R 8,000.00 and R 14,000.00

Hybrid Inverter

Hybrid Inverters

Between R 18,500.00 and R 44,000.00

Whatever the choice, it’s always best to start where you can, saving you money in the long term and having the ability to re-jig your system as time goes on.
Chapter 7

Best Solar Inverters in South Africa

Quality inverter brands

To name the best pound for pound brand is tricky. Each brand does have its strengths and weaknesses, depending on its application.

Here are the best brands that we would recommend:

Fusion Solar logo

Fusion Solar

Fusion Solar’s creators have seen the demand in South Africa for more choice when it comes to Solar equipment.

Passion for the South African Solar Industry has seen them answer this demand by bringing in products fit for the South African market.

Top features:

  • Stylish
  • Functional
  • Reliable
  • High Quality
  • Excellent warranties
Additionally, their products are specifically chosen for their price point and size to be able to cope with long periods of no grid supply and compatibility with quality products from other suppliers.

Their Solar Products have been popular thanks to their reliability and stylish design.

View Fusion Solar website


  1. Anonymous

    Visitor Rating: 4 Stars

  2. Visitor Rating: 5 Stars

  3. Nikola Batev

    Good day,
    I would need some advice and pricing.
    In January i bought 16 365W solar panels, 3kVA RCT 48V Inverters x 3 and four Pylon-Tech U 2000 batteries.
    During the installation ALL three inverter did blow up – incorrect installation by some company from Brakpan – CHC Electrical. So – now I am looking for the new inverters. I wold like to go for 5kVA – two f them. I would need a quote from you and advice – which ones can I install, how many solar panels can they take and – most important – can I split the system in two – one 5kVA + 2 Pylon Tech batteries and join them…or would you advise something else.

  4. Hi

    Sorry to hear about the inverters blowing up, your choice of 5kVa inverters sounds like a better option but before suggesting anything what kind of appliances/machines are you running and what is the maximum kW’s are you dealing with?

    If you’re looking for high end inverters that handle large loads and spikes we suggest the Victron inverters, if however you are dealing with moderate loads and spikes we’d would suggest an inverter from our Hybrid range or for the lower end of the end we suggest the Kodak (Voltronic) range.

    Thankfully you have PylonTech which are a good brand with a decent compatibility range.

    Give us a call or email us to advise further.

  5. Anonymous

    Visitor Rating: 4 Stars

  6. Visitor Rating: 4 Stars

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