Surely to oversize solar inverters beyond their generation capacity is not necessarily a good idea? Get ready to discover that it’s the best thing you could do, when within specification, and the inverter manufacturers themselves recommend it. Mind blown!

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Oversize and thrive.

Many leading solar inverter manufacturers such as SMA and Fronius suggest that if remaining within the rated voltage and current input ratings of the inverter, oversizing solar inverters by up to 50% are the best way to maximise solar energy production.

Got an additional question in relation to oversizing solar inverters? Ask below at the bottom of this post. – PSW Team.

Fronius Solar Inverters Perth WA by Perth Solar Warehouse

How does oversizing maximise production?

Solar inverters are more efficient when they operate at peak. That’s the consensus. However, the modern-day maximising of production is often based around particular grid or feed-in tariff limitations.

Western Power often will not allow any single-phase solar inverter capacity higher than 5kW output. Three-phase solar inverter capacities are limited depending on localised transformer limitations in which an installation is connected to on the grid.

In an alternative sense, solar inverter capacities which exceed 5kW output capacity are excluded from Synergy‘s feed-in tariff of 7c per unit (kWh) exported to the grid. 

How much can one oversize solar inverters?

In theory, as much as possible. Ensuring only the input voltage and current ratings of the solar inverter are not exceeded. Beyond such, alternative external limitations set by national and local regulatory authorities are in place to also limit one’s ability to oversize solar inverters in general.

The simple calculation which can apply to all criteria though is as follows: Solar inverter output capacity multiplied by 1.33 or 33%.

Why you should oversize solar inverters Perth Solar Warehouse

Why is 1.33 a magic number?

1.33 or 33% of a solar inverters rated output capacity has been determined by the powers that be in Australia, as an acceptable oversizing increment without being detrimental to a solar energy systems ability to offset carbon emissions.

Remember, your ability to claim a subsidy on the upfront purchase price of a solar power system is based on its ability to offset carbon emissions now and into the future.

Oversizing solar inverters simplified.

Forget the equations. You need to know the most you can oversize your particular solar inverter capacity. Below are the most common instances to oversize solar inverters and their maximum input capacity which apply to STCs (Small Technology Certificates) – your subsidy. Here it is simplified:

  • 3 kW Inverter – 3.9 kW Solar.
  • 5 kW Inverter – 6.6 kW Solar.
  • 8 kW Inverter –  10.6 kW Solar.
  • 10 kW Inverter – 13.3 kW Solar.
  • 20 kW Inverter – 26.6 kW Solar.
  • 30 kW Inverter – 39.9 kW Solar.

When network limitations are set by inverter output capacity, oversizing solar inverters are the best way to maximise generation capacity towards overall kWh.

The PSW Ultimate Guide bonus:

FREE Upgrade on Premium Range Panels. Theres never been a better time to oversize solar inverters with a FREE oversizing upgrade through Perth Solar Warehouse. Get 6.6kW of solar panels for the price of of 5kW or get 13kW of solar panels for the price of 10kW on all premium range solar panel options. 

Mention “OVERSIZE BONUS 2019” prior to buying.

Why 6.6kW of solar panels on a 5kW inverter?

The most common system combination where oversizing solar inverters occur and to which the reasoning is more so financial than anything else. Residential customers who install greater than 5kW solar inverter capacities will forfeit their ability to qualify for the Synergy solar feed-in tariff (Renewable Energy Buyback Scheme – REBS). 

Therefore what’s the best way to achieve greater power production without increasing solar inverter capacity? You guessed it, oversizing solar inverters to the maximum allowable input capacity, 6.6kW.

Additionally, single-phase solar supplies connected to the Western Power network are currently limited to a maximum of 5kW output to mitigate the effects of phase-imbalance.

Why 13.3kW of solar panels on a 10kW inverter?

Certain network limitations can exist around 3-phase 10kW inverter capacities enforcing a maximum 10kW output capacity. However, in many instances, the popularity of the 10kW inverter range by most manufacturers ensures an enticing and reduced capital outlay as opposed to selecting a 12 kW or 15kW inverter capacity with virtually the same overall yield.

In many instances, 10kW inverters are less expensive than their 8KW counterparts due to increased demand and the competitive nature of the market.

Related: Installed 13kW solar energy system options by Perth Solar Warehouse (with prices). Shop now > 

Why 39.9kW of solar panels on 30kW inverter capacity?

Another excellent example is the export limiting requirements surrounding solar energy systems greater than 30kW on the Western Power network. In this instance, the ability to oversize up to 39kW facilitates a relatively basic grid-tie solar energy system which has the ability to generate almost as much energy as a 40kW system without expensive export limiting features. 

Oversize & thrive.

Below is the best way to ensure your maximum oversizing potential. Browse PSW’s entire oversized solar system range with little to virtually no additional expense when compared to a like for like rated product pairing.

  • Discover huge value with an unbeatable selection of oversized solar deals within the latest PSW digital catalogue delivered direct to your email inbox. .
  • Select a product combination which meets your budget or technology desire.
  • Email back a PSW technician in your time to perform a free remote site report to match your preferred system with your specific roof profile.

PSW technical design engineers ensure when oversizing solar inverters all system parameter remain whin each manufactures intended operating parameters. Ensuring all system warranty requirements are met for a long and healthy operational system life.



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Oversize your solar inverter and harness maximum yields for little to no additional cost. The entire oversized PSW product range is available within the latest PSW digital catalogue for ultimate value.

Get your copy via the above link, and you’ll be guaranteed the best price for your specific installation. It’s that simple.  

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