Grid-connected solar vs standalone power systems: what’s the difference?

Grid-connected solar and standalone power systems both generate electricity using photovoltaic panels, but they operate in very different ways. They also require different design decisions, safety procedures and technical competencies.

Understanding the difference helps electricians choose the most suitable training pathway, particularly if you want to expand from standard residential grid-connect work into remote and off-grid applications.

CET offers training for both system types. Explore our post-trade renewable energy courses.

What grid-connected solar systems are

Grid-connected solar systems are designed to operate alongside the electricity network. These systems generate power through solar panels and supply electricity to a building’s electrical installation. When solar generation exceeds the building’s demand, surplus electricity may be exported back to the grid, depending on the system configuration and network settings.

A typical grid-connected system includes PV panels, a grid-connected inverter, switchboard and protection equipment, and metering that records energy imports and exports.

Because grid-connected systems interact with the network, they must meet relevant Australian Standards and network requirements. In practice, that commonly includes standards such as AS/NZS 4777 (covering inverter behaviour and grid connection requirements) and AS/NZS 5033 (covering PV array installation requirements).

What standalone power systems are

Standalone power systems, often referred to as off-grid systems, are designed to operate independently of the electricity network. These systems generate and store electricity locally so a property can operate without relying on grid supply.

Standalone systems are commonly used in remote homes and farms, regional sites without reliable grid access, and some industrial and infrastructure applications. They are also relevant in contexts where reliability and redundancy are critical.

In addition to PV panels, standalone systems typically include battery storage and energy management equipment, and may include backup generation depending on the site requirements. Battery installations introduce additional safety and design considerations, including isolation, protection and location requirements. AS/NZS 5139 provides installation and safety requirements for battery energy storage systems.

Key technical differences between grid-connected and standalone systems

Although both system types use PV panels, their design priorities are different.

A grid-connected system can often operate without batteries because the grid acts as a backup supply when solar generation is low. A standalone system relies on storage and energy management to supply power when solar generation is unavailable, which makes battery capacity and load planning central to the design.

Standalone systems also require a higher level of design planning because they must be sized to meet the site’s total demand, including seasonal variation, usage patterns, and critical loads. Grid-connected systems are usually simpler in this respect because the network can supply power when needed.

Risks and responsibilities when working with solar systems

Solar and battery systems introduce electrical risks that electricians need to manage carefully. PV arrays can produce high DC voltages, batteries can store significant energy, and both systems require correct isolation and shutdown procedures. Work also needs to integrate safely with the existing electrical installation.

Training matters because it builds the competence needed to design, install, test and verify systems in line with the relevant standards and site requirements.

Training, licensing and accreditation

Training is a key part of working competently with solar and battery systems, but completing a course is not the same as being licensed or accredited.

Electrical licensing requirements are set by the relevant state or territory regulator. Separate to licensing, accreditation is often required when a system owner wants the installation to be eligible for incentives such as Small-scale Technology Certificates (STCs). The Clean Energy Regulator states that STC-eligible systems must be designed and installed by appropriately accredited people through Solar Accreditation Australia (SAA).

Choosing the right training pathway

Many electricians begin with grid-connected PV training because those systems are common in residential and commercial environments. Electricians working in remote power applications often progress into standalone system design and installation, which involves deeper focus on storage, load management, and reliability.

At CET, we offer training in both grid-connected and standalone power systems through our partnership with PMV Training. After successful completion, you receive a Statement of Attainment. Depending on the course and your circumstances, this may support an application for SAA accreditation, noting that accreditation requires a separate application process and supporting documentation.