A custom home provides an opportunity to consider not only how a property will look, but how it will function for decades to come.

As Australian households move towards electric vehicles, induction cooking, heat pump hot water and all-electric heating and cooling, energy is becoming an increasingly important part of the design conversation. Rooftop solar, home battery storage and electric vehicle charging are no longer isolated upgrades. When planned together, they can form an integrated home energy system tailored to the way its occupants live.

The most successful systems are considered early. Roof orientation, plant locations, electrical capacity and cable pathways can all be resolved during the design phase, avoiding compromises once construction is complete.

Why energy planning should begin with the home design

Solar is often treated as one of the final items added to a new home. By that stage, however, the roof form, switchboard position, garage layout and exterior finishes may already have been decided.

This can leave homeowners choosing between energy performance and architectural presentation. Panels may need to be split across several roof faces, batteries placed in less convenient locations or visible conduits added to otherwise carefully finished walls.

Early collaboration between the architect, builder and solar electrician allows the energy system to become part of the building rather than something attached to it later.

Planning ahead can help to:

– Preserve clean, uncluttered rooflines
– Maximise the usable area available for solar panels
– Keep electrical equipment in practical but discreet locations
– Allow safe, compliant battery placement
– Provide suitable wiring for an EV charger
– Reduce the need to open finished walls or upgrade electrical infrastructure later
– Prepare the home for growing electricity demand

It also enables the solar array, battery and charger to be sized as one system instead of three separate purchases.

Begin with the home’s future energy needs

A new home’s energy use may look very different from that of the property its owners currently occupy.

Larger living areas, pools, underfloor heating, additional refrigeration, automated gates and extensive lighting can all increase consumption. Conversely, high-performance glazing, insulation, shading and efficient appliances may reduce the energy required to keep the home comfortable.

The design should also account for changes that may occur during the owner’s time in the property. These could include purchasing an electric vehicle, adding a second EV, working from home more frequently or installing a pool heater.

An energy assessment can consider:

– Estimated daily household consumption
– Daytime and evening usage patterns
– Heating, cooling and hot water systems
– Pool and spa equipment
– Current or future electric vehicles
– Single-phase or three-phase electricity supply
– Whether backup power is a priority
– Available roof area and expected solar generation

This provides a stronger basis for design than selecting a standard solar package based solely on the number of bedrooms.

Design the roof for solar performance and presentation

A well-designed solar roof does not need to detract from a home’s architecture.

Large, uninterrupted roof sections generally provide greater flexibility than multiple small roof planes broken up by valleys, skylights, vents and decorative features. Consolidating rooftop equipment can create more room for an orderly panel layout while maintaining a cleaner appearance.

Orientation is important, but it is not the only consideration. North-facing panels can produce strong overall generation in much of Australia, while east- and west-facing arrays can spread production across the morning and afternoon. This may better align with when the household uses electricity.

The ideal approach depends on the site, climate, roof pitch, surrounding trees and household routine.

During design, consider:

– Which roof planes will receive reliable sunlight
– Potential shading from neighbouring buildings and mature trees
– The position of chimneys, aerials, vents and skylights
– Space for safe installation and maintenance access
– Whether dark panels and mounting hardware suit the roofing material
– How rainwater collection and roof drainage will interact with the array
– Whether additional roof capacity may be required in the future

For complex roof forms, microinverters or power optimisers may help individual panels operate more independently. However, thoughtful roof planning remains preferable to relying on equipment to compensate for avoidable shade or fragmentation.

Plan solar and battery storage as one system

Solar panels generate electricity during daylight hours. A battery can store some of the unused generation for the evening, overnight or during periods of higher electricity prices.

The relationship between array size and battery capacity is important. A large battery offers limited value if the solar system rarely produces enough surplus energy to charge it. Likewise, a modest battery may not meet the evening demand of a large all-electric home.

Battery selection should reflect:

– Expected surplus solar generation
– Typical evening and overnight consumption
– Desired backup duration
– Which circuits need to operate during an outage
– Future EV charging requirements
– Whether the battery can be expanded
– Available installation space

If blackout protection is important, it should be discussed from the outset. A battery does not automatically power the entire home during a grid outage. Backup capability depends on the equipment, system configuration and circuits connected to the backup supply.

Some owners may prioritise essential loads such as refrigeration, lighting, internet and garage access. Others may want broader backup coverage. The latter can require more battery capacity and careful management of high-demand appliances.

Eligible batteries can currently receive incentives through the Australian Government’s Small-scale Renewable Energy Scheme, although eligibility conditions and certificate values can change. The Clean Energy Regulator should be consulted for current program information when the installation is being planned.

Incorporate the battery into the architecture

Battery location should be resolved before floor plans and elevations are finalised.

The installation must meet Australian electrical and battery safety requirements, including rules relating to clearances, protection and proximity to doors, windows, living areas and ignition sources. The preferred location will depend on the battery, property and system design.

Garages, external utility areas and suitably protected side walls are common possibilities. A dedicated plant area may provide an elegant solution in a custom home, particularly when it is designed with suitable access, ventilation and weather protection.

The battery should remain accessible for installation and servicing. Concealing it inside tightly fitted cabinetry or placing it behind extensive landscaping can create practical and compliance issues.

The inverter, battery and switchboard do not necessarily need to occupy the most prominent wall of the garage. With early planning, they can be positioned away from the main entry and key sightlines while remaining safe and serviceable.

Make the garage EV-ready

An EV charger can draw considerably more power than a standard household outlet. Installing suitable electrical infrastructure during construction is generally easier than retrofitting it through finished walls, ceilings, landscaping and driveways.

Even if an electric vehicle is not part of the immediate plan, the design can include:

– A dedicated cable pathway to the garage or carport
– Space in the switchboard for additional protection devices
– A suitable mounting position beside the vehicle
– Data or communications cabling where required
– Capacity for dynamic load management
– Provision for a second charger if the household may eventually have two EVs

Charger location should reflect where the vehicle’s charging port will sit when parked. Cable length, pedestrian access, garage doors, storage and the possibility of parking outside should all be considered.

Three-phase power may offer access to higher charging rates with compatible equipment and vehicles, but faster is not always necessary. Most cars remain parked at home for many hours, so the appropriate charger should be selected around driving habits, the home’s electrical capacity and the vehicle’s onboard charging limit.

Use surplus solar to charge the car

The greatest benefit comes when the EV charger can communicate with, or respond to, the home energy system.

A solar-aware charger can vary its output according to the amount of surplus solar available. Rather than exporting all unused generation to the grid, the household can direct more of it into the vehicle.

Different charging modes may allow the owner to prioritise:

– Surplus solar charging
– A combination of solar and grid electricity
– Scheduled charging during off-peak periods
– Faster charging when the vehicle is needed urgently

The preferred strategy will depend on when the car is at home. A vehicle regularly parked in the garage during the day is well placed to absorb solar generation directly. Where the vehicle is away during daylight hours, a mix of weekend solar charging, scheduled grid charging and battery coordination may be more practical.

It is also important to decide whether stored battery energy should be used to charge the car. In many homes, preserving the battery for evening household loads may be more economical than transferring that energy into the much larger vehicle battery.

Check the home’s electrical capacity

Solar, batteries and EV chargers must work alongside every other electrical load in the home.

Large custom homes can contain several high-demand appliances operating at once, including induction cooktops, ovens, ducted air conditioning, pool equipment, electric hot water and vehicle charging.

A detailed load assessment can determine whether the proposed supply and switchboard are appropriate. Dynamic load management may also be used to reduce charger output temporarily when the home is drawing a large amount of power, helping prevent the property’s supply from being overloaded.

The local electricity distributor’s connection and solar export rules must also be considered. Export limits vary between networks and may affect system configuration. In some circumstances, export control equipment can allow a larger solar array to be installed while restricting how much power is sent back to the grid.

Coordinate the team before construction begins

Energy planning is most effective when the relevant professionals communicate early.

The architect can consider roof form, visual impact and equipment locations. The builder can coordinate access, structure and service pathways. The electrician can assess the incoming supply and switchboard. An experienced solar designer can model likely generation and bring the solar, battery and EV charging components together.

Key decisions should ideally be made before the electrical plans and roof penetrations are finalised. At a minimum, the documentation should identify:

– Proposed solar panel zones
– Inverter and battery locations
– Main switchboard capacity
– Essential backup circuits
– EV charger position
– Cable and communications routes
– Metering and monitoring requirements
– Allowances for future expansion

This level of coordination helps protect both the home’s architectural integrity and the performance of its energy system.

A home designed around how energy will be used

A future-ready custom home is not defined by the number of technologies installed. It is defined by how well those technologies work together.

Solar can generate energy during the day. Battery storage can shift some of that energy into the evening. Smart EV charging can turn surplus generation into kilometres of driving. Efficient appliances and passive design can reduce the amount of energy the household needs in the first place.

When these elements are considered together, the result can be a home that is more comfortable, adaptable and economical to operate without compromising its design.