Solar sized to your load, not your roof
Commercial solar PV generation offsets grid imports at the retail rate while the sun is up. Sized against twelve months of interval data rather than available roof area, it becomes the lowest-cost energy your site can buy, and the foundation the other four pillars are built on.
Last updated 20 October 2026

At a glance
- Saves
- Displaces daytime grid imports at the retail rate
- Earns
- Export credit, and STCs for systems up to 1 MW installed from 1 October 2026; LGCs above 1 MW
- On its own
- Never reaches the evening peak or the billed demand charge
- Sized by
- Twelve months of interval data, not available roof area
How generation is sized here
Sizing starts from the load profile, not the roof. We model self-consumption interval by interval against your network and retail tariff, then size the array to the energy the site can actually use or store. Oversizing for export is how a system looks impressive at handover and underperforms for twenty-five years.
For a starting figure from annual electricity use, before that interval modelling, try the solar sizing calculator.
What solar alone cannot do
Solar generates in daylight, so it cannot reach the evening peak or the demand charge set after its output has fallen away, and feed-in tariffs pay little for the midday surplus. Storage, demand response and control are what take a site past that ceiling.
Read our article on why commercial solar alone caps out, and what storage and control add.
Four system architectures, chosen by operational requirement
Solar is not treated as a standalone asset here. Each architecture is engineered to perform as part of an interconnected energy system, and the right one is decided by how the site operates, grid position, resilience requirement and what the system has to integrate with later.
| System | What it does | When it is right |
|---|---|---|
| Grid-tied | Reduces reliance on purchased electricity while maintaining grid connection | Immediate cost reduction, with storage and control added later |
| Solar hybrid | Combines generation with battery storage for self-sufficiency and peak management | Sites carrying a demand charge or needing operational resilience |
| Off-grid | Standalone generation and storage engineered for full supply independence | Remote or constrained sites where network supply is limited or unavailable |
| Energy monitoring | Real-time visibility across generation, usage and performance | Every system. It is what makes continuous optimisation possible |
Lower operating costs
Reduce reliance on grid electricity while improving cost predictability over time.
Scalable infrastructure
System-ready architecture, so storage, demand response and control can be added as the energy strategy evolves.
Commercial-grade reliability
Technologies selected for long-term performance in demanding Australian operating environments.
How solar works with the other four pillars
Common questions about commercial solar
How much of a commercial site’s energy can solar offset?
A well-designed commercial solar system typically offsets 30 to 60 per cent of site consumption. The ceiling is structural: solar generates in daylight while most commercial load peaks in the late afternoon. Adding storage, demand response and intelligent control is what moves a site past that ceiling.
Should a commercial solar system be sized to annual consumption?
No. It should be sized to the load profile, meaning the shape of consumption across the day, and to how much surplus the site can self-consume or store. Sizing to annual consumption produces export the site is paid very little for.
What is the difference between grid-tied, hybrid and off-grid solar?
A grid-tied system reduces purchased electricity while staying connected to the network. A hybrid system adds battery storage, so generation can be shifted into peak windows and used for demand management and resilience. An off-grid system operates independently of the network, for remote or constrained sites where supply is limited or unavailable.
What do energy monitoring systems provide?
Real-time visibility across generation, usage and system performance. Monitoring is what makes continuous optimisation possible. Without measurement there is nothing for the control layer to act on and no way to verify the system is performing to its design.
Is solar still worth installing in 2026?
Yes, as the generation layer of an integrated system. As a standalone product its returns are capped by collapsed feed-in tariffs and by demand charges it cannot touch. As part of a controlled ecosystem it is the cheapest energy on the site.
What is involved in a commercial solar installation?
A commercial installation starts with the electrical infrastructure rather than the roof: switchboard capacity, protection settings and network position determine what the site can carry and what approvals it needs. Then the array is sized against twelve months of interval data, engineered, approved with the network, installed and commissioned. Vitalic does the design, the installation and the ongoing operation, so accountability for how the system performs does not change hands at commissioning.
What rebates and incentives apply to commercial solar in Australia?
Solar systems up to 1 MW installed from 1 October 2026 create small-scale technology certificates (STCs), whose value is usually taken as a discount off the installed price rather than a payment received later. Systems above 1 MW create large-scale generation certificates (LGCs) as they generate. Eligibility and the deeming arrangements change over time, so the current position should be confirmed as part of the assessment rather than assumed from a previous project. How mid-scale solar STCs work.
How is industrial solar different from a commercial rooftop system?
Industrial sites usually differ in three ways: a much flatter load profile that runs through the night, roof structures and areas that change what can be mounted and where, and a network connection large enough that export limits and protection studies become the governing constraint. The panels are rarely the difference. The engineering around the connection and the structure is.
What solar is worth on your site
Twelve months of NMI interval data and your current tariff is enough to model it against your real load.
Need a standalone supply? Discuss an off-grid requirement.