What Does 200% PV Oversizing Mean? A Simple Guide

200% PV Oversizing means an inverter can support a solar PV array that is up to twice its rated AC capacity, subject to the inverter’s specifications.

For example, a 5kW inverter with 200% PV oversizing can support up to 10kW of PV capacity.

The inverter will still deliver its rated AC output. The additional PV capacity helps provide more usable solar energy during periods of lower sunlight.

What Is PV Oversizing?

PV oversizing means installing more solar PV capacity than the inverter’s AC output rating.

Inverter	PV Capacity	Oversizing
5kW	5kW	100%
5kW	7.5kW	150%
5kW	10kW	200%

The purpose is simple: give the inverter access to more solar energy throughout the day.

How Does 200% PV Oversizing Work?

Imagine a 5kW inverter connected to a 10kW PV array.

During strong sunlight, the PV array may produce more power than the inverter can convert into AC power. The inverter remains limited to its rated 5kW AC output.

During mornings, evenings or cloudy conditions, the panels may produce much less than their rated capacity. The larger PV array can help provide more usable solar energy during these periods.

200% PV oversizing does not turn a 5kW inverter into a 10kW inverter. It simply gives the inverter access to more PV capacity.

Why Do Solar Installers Use PV Oversizing?

Solar installers and EPC contractors may use PV oversizing to:

• Generate more usable solar energy throughout the day
• Improve generation during lower sunlight conditions
• Extend the hours of useful solar production
• Make better use of the inverter’s available AC capacity

However, the inverter must be designed to support the required PV capacity.

What Should You Check Before Using 200% PV Oversizing?

The oversizing percentage is not the only specification to check.

Before designing the PV array, check the inverter’s:

• Maximum PV input power
• Maximum PV voltage
• Maximum PV current
• MPPT voltage range
• Maximum short-circuit current

MPPT (Maximum Power Point Tracking) is the inverter function that helps extract available power from the solar panels.

Always make sure the proposed PV array stays within the inverter manufacturer’s specified limits.

Choosing an Inverter with 200% PV Oversizing

If your project requires a higher PV-to-inverter ratio, choosing an inverter that specifically supports 200% PV oversizing can make system design more flexible.

For example, the Mastter Series hybrid inverter from Power & Sun supports up to 200% PV oversizing. It is available in 5kW, 6kW, 8kW and 10kW single-phase LV models.

Along with PV oversizing, the Mastter Series offers:

• 97.7% maximum efficiency
• IP66 protection
• Smart monitoring
• 7.5-year manufacturer warranty

See the Mastter Series Hybrid Inverter range to check the available models and specifications.

200% PV Oversizing for Solar Projects in Nigeria

For solar installers and EPC contractors in Nigeria, PV oversizing can be useful when solar generation varies throughout the day.

The right inverter and battery combination can help meet the project’s energy and backup requirements while making better use of available solar generation.

If you are sourcing solar equipment for a project in Nigeria, Power & Sun supplies solar inverters and battery storage solutions for residential, commercial and EPC applications.

Explore solar inverter and battery solutions in Nigeria

Final Takeaway

200% PV oversizing means an inverter can support up to twice its rated AC capacity in PV capacity, where permitted by its specifications.

The key is to check the inverter’s PV input limits before designing the system.

For projects where higher PV capacity is required, the Mastter Series provides up to 200% PV oversizing, along with IP66 protection, smart monitoring and a 7.5-year manufacturer warranty.

Frequently Asked Questions