Solar + Heat Pump Wyong: Daytime Hot Water Guide | Kratos Energy

Heat Pumps and Solar: A Wyong Home Guide

If you have rooftop solar—or are planning it—for a home in Wyong NSW 2259, a heat-pump hot-water system can be one of the most useful electrical loads to coordinate with your daytime solar generation.

Instead of exporting excess solar during the middle of the day and heating water later using grid electricity, a correctly controlled heat pump can often be scheduled to operate while the panels are producing.

The key idea is simple:

Generate solar → run the heat pump during solar hours → store the energy as hot water for later use.

However, the best schedule depends on your solar system, hot-water demand, electricity tariff and whether the heat pump is connected to a controlled-load circuit.

This guide focuses mainly on heat-pump hot water, because its operating time can often be shifted. Reverse-cycle heat pumps used for home heating and cooling work differently because their operating time is normally driven by comfort and occupancy.

Kratos Energy designs residential solar systems around household electricity use rather than system size alone. Explore Kratos residential solar systems. (Kratos Energy)

Why Pair a Heat Pump With Rooftop Solar?

Heat-pump water heaters use electricity to move heat from the surrounding air into the water rather than heating the water directly with a resistive element.

The Australian Government states that heat-pump water heaters can use around 30% of the electricity of a conventional electric hot-water system. (Energy.gov.au)

That lower electrical demand can make them particularly suitable for rooftop solar.

The combination can help a household:

• Increase daytime solar self-consumption

• Reduce grid electricity used for hot water

• Reduce unnecessary solar exports

• Shift a flexible load away from evening periods

• Store daytime solar indirectly as hot water

The tank effectively becomes a form of thermal storage.

You are not storing electricity as a battery does; you are using daytime electricity to store heat that can be used later.

Why This Matters for Wyong Homes

The wider postcode 2259 is strongly dominated by detached housing. The 2021 Census recorded approximately 90.2% of occupied private dwellings in postcode 2259 as separate houses. (Australian Bureau of Statistics)

That housing profile makes rooftop solar and household hot-water optimisation particularly relevant.

But there is no single energy pattern for every Wyong property.

One household may:

• Have four occupants

• Use most hot water in the morning

• Have a 6.6kW solar system

• Export heavily around midday

Another may:

• Have two occupants

• Work from home

• Use an EV

• Already consume most daytime solar

The correct heat-pump schedule should therefore come from the home's actual solar and electricity profile.

When Should a Heat Pump Run With Solar?

For a solar-equipped home, a useful starting point is usually the period when rooftop generation is strongest.

That often means running the heat pump between late morning and early afternoon, subject to the system's controls, tariff and household hot-water requirements.

Energy.gov.au specifically recommends that programmable hot-water systems can be scheduled to:

• Run when rooftop solar is generating

• Operate when heat-pump efficiency is favourable

• Operate when electricity prices are lowest. (Energy.gov.au)

A simple daily strategy could look like:

The exact schedule will depend on the heat-pump model and household.

Why Midday Operation Can Improve Solar Self-Consumption

Consider a hypothetical Wyong home producing:

4kW of solar at noon

while the home itself is using:

1.5kW

That leaves around:

2.5kW of available solar

before considering system losses and export conditions.

If a heat-pump water heater operates during that period, part of that surplus can be used directly rather than sent to the grid.

The energy flow becomes:

Solar → household loads + heat pump

instead of:

Solar → grid export

followed later by:

Grid → hot-water heating

The more of your own generation you can use productively, the less electricity you generally need to purchase.

Do Not Run Every Appliance at the Same Time

Shifting loads into solar hours is useful, but it does not mean every major appliance should start at midday.

Suppose your home simultaneously runs:

• Heat-pump hot water

• Pool pump

• Dishwasher

• Washing machine

• EV charger

• Air conditioning

Total household demand could exceed solar production, causing the property to import grid electricity anyway.

A better strategy is to sequence flexible loads.

For example:

10:00 AM–12:00 PM: heat-pump water heater
12:00 PM–2:00 PM: pool pump
2:00 PM onwards: EV charging if solar remains available

The ideal schedule depends on your system size and actual appliance demand.

How Much Solar Do You Need for a Heat Pump?

There is no fixed rule such as:

6.6kW solar = one heat pump

because solar-system capacity and heat-pump electricity consumption measure different things.

The useful calculation is:

Heat-pump electrical input × operating time = electricity required

For example, if a hypothetical heat pump draws:

1kW

for:

3 hours

it consumes roughly:

3kWh

The actual input power and operating duration vary significantly by product, water temperature, tank size, ambient temperature and household demand.

This means a homeowner should check the specific heat-pump model's rated electrical input, rather than relying on generic figures.

6.6kW vs 10kW Solar With a Heat Pump

Heat-pump hot water by itself does not necessarily justify a large solar system.

A 6.6kW system may be more than adequate for a moderate-use household where hot water is the main flexible daytime load.

A 10kW system may become more relevant where the home also has:

• Ducted air conditioning

• Pool filtration

• EV charging

• Higher daytime occupancy

• Future battery storage

• Larger overall electricity demand

Kratos currently positions its 10kW residential package for homes needing additional generation headroom for loads including air conditioning, pools, batteries and EVs. (Kratos Energy)

The heat pump should therefore form part of the overall load calculation—not determine solar-system size on its own.

Use Your Solar Data Before Changing the Timer

If solar is already installed, monitoring data can help identify the best heat-pump operating window.

Look for:

Solar generation

When does production normally peak?

Household consumption

What loads already operate during that period?

Grid exports

When are you sending the most excess solar to the grid?

Seasonal changes

Does your available solar surplus change substantially in winter?

A strong opportunity exists when the home consistently exports electricity at the same time the heat pump could be heating the tank.

Kratos' residential systems include Wi-Fi production monitoring, while actual consumption visibility depends on the metering and equipment installed. (Kratos Energy)

Controlled Load: Check Before Changing Anything

This is particularly important in Wyong, which sits within the Ausgrid network area; Ausgrid's outage information specifically lists Wyong within its network. (Ausgrid)

Some hot-water systems operate on a controlled-load tariff.

A controlled load is separately wired and supplied according to network switching arrangements, often at a lower electricity rate.

Ausgrid says controlled loads are commonly used for hot water and that modern switching arrangements increasingly include daytime operating windows to make use of abundant solar generation. (Ausgrid)

Heat-pump storage water heaters can also be eligible for Ausgrid controlled-load arrangements where the equipment meets the applicable technical criteria. (Ausgrid)

Before moving a heat pump from controlled load to normal supply:

Check:

• Your electricity bill

• Current controlled-load tariff

• Heat-pump electrical configuration

• Retail electricity rate

• Solar export pattern

• Retailer requirements

Energy.gov.au specifically warns that changing hot water from controlled load to solar self-consumption requires an appropriately accredited electrician, and the financial benefit depends on the electricity plan. (Energy.gov.au)

Do not simply change the wiring or timer yourself.

Controlled Load vs Solar: Which Is Better?

There is no universal answer.

Consider two options.

Option A — Keep the Heat Pump on Controlled Load

Potential advantage:

The heat pump may receive electricity at a comparatively low controlled-load tariff.

This can still be economical even if it is not directly powered by rooftop solar.

Option B — Run the Heat Pump From the Main Supply During Solar Hours

Potential advantage:

The heat pump can use electricity that would otherwise be exported.

This may increase household solar self-consumption.

Which option is cheaper depends on:

controlled-load rate vs value of self-consumed solar vs feed-in tariff

and the household's actual usage pattern.

The correct comparison should use your retailer's real tariff, not a generic national figure.

Heat Pumps Can Work Well With East- or West-Facing Solar Too

A north-facing roof is not essential.

For example:

East-facing solar

Can provide stronger generation earlier in the day.

A heat pump may be programmed to operate in the late morning.

West-facing solar

Can provide stronger afternoon production.

A later hot-water heating window may align better.

The best timer setting should follow the actual generation profile of the roof.

Kratos' Solar Output Calculator can provide a postcode-based generation estimate for different system sizes. Enter 2259 for Wyong. (Kratos Energy)

A site-specific assessment should then account for orientation and shading.

What About Winter?

A timer that works perfectly in summer may not be ideal throughout winter.

During winter:

• Solar days are shorter

• Solar generation may be lower

• Hot-water demand can rise

• Heat-pump operating conditions may change

A heat pump may therefore need to operate for longer or use some grid electricity on lower-generation days.

The objective should not necessarily be:

100% solar-powered hot water every day

but rather:

maximise sensible solar use while maintaining reliable hot-water supply.

Comfort and hot-water availability still matter.

Should You Add a Battery for the Heat Pump?

Usually, the first step should be to run a flexible heat-pump load directly from daytime solar where practical.

Using:

Solar → heat pump → stored hot water

avoids converting electricity into battery storage and then converting it again later.

A battery may still make sense if the household also has:

• Significant evening consumption

• Backup-power requirements

• EV charging after sunset

• High solar exports

• Time-of-use tariff opportunities

But a battery should be assessed from the home's complete energy profile rather than installed only to run hot water at night.

Can a Heat Pump Reduce Solar Exports?

Yes, if it operates while excess solar is available.

Suppose your home regularly exports:

8kWh between 10 AM and 2 PM

and the heat pump consumes:

3kWh during a scheduled heating cycle.

If solar production remains sufficient, part of that 3kWh may shift from export to direct household use.

That is exactly the type of flexible load scheduling that can improve solar self-consumption.

What About Heat-Pump Rebates in NSW?

The NSW Government currently provides incentives for eligible upgrades to energy-efficient heat-pump hot-water systems through the Energy Savings Scheme.

Current NSW guidance indicates an eligible replacement can receive an upfront discount, with indicative standard incentives of up to:

• $640 when replacing an electric water heater with an eligible heat pump

• $330 when replacing a gas water heater with an eligible heat pump. (NSW Climate and Energy Action)

Actual discounts vary by product, installer, eligibility and project conditions.

These are heat-pump incentives administered through eligible providers. They are separate from Kratos Energy's rooftop-solar services.

Solar + Heat Pump Example for a Wyong Home

Consider an illustrative household with:

Solar: 6.6kW
High solar exports: 10 AM–2 PM
Heat pump: programmable storage system
Hot-water use: mostly morning and evening

A practical strategy might be:

Morning

Use water heated the previous day.

Late morning

Solar output increases.

Around midday

Heat pump runs and reheats the tank.

Afternoon

Remaining excess solar supplies other household loads or is exported.

Evening

Stored hot water is used without requiring immediate high electricity consumption.

This is an illustrative scheduling example, not a setting for every heat pump.

The unit's manufacturer instructions, thermostat controls and required sanitation cycles must always be followed.

Wyong Solar + Heat Pump Checklist

Before coordinating a heat pump with rooftop solar, check:

Solar

• System size

• Typical daytime generation

• Roof orientation

• Export pattern

Heat Pump

• Rated electricity input

• Tank capacity

• Programmable timer

• Manufacturer operating requirements

• Required temperature/sanitation settings

Electricity

• Controlled-load tariff

• Main electricity tariff

• Feed-in tariff

• Smart-meter data

Timing

• Household hot-water use

• Solar peak period

• Pool or EV schedules

• Seasonal changes

Installation

• Licensed hot-water installer

• Accredited electrician for circuit changes

• Correct switchboard and metering arrangement

The aim is to coordinate the equipment—not simply force every electrical load into the same midday window.

Frequently Asked Questions

Solar and Heat Pumps in Wyong: The Bottom Line

For a Wyong NSW 2259 home, a heat-pump water heater can be an excellent flexible load to coordinate with rooftop solar.

The strongest strategy is usually:

Measure solar exports → check hot-water demand → check controlled load → choose a practical daytime heating window → monitor the result.

Do not automatically change from controlled load.

Do not oversize the solar system purely because a heat pump is being installed.

And do not assume that operating every appliance at noon will maximise savings.

The objective is to use more of your own solar at the right time while keeping reliable hot water and a suitable electricity tariff.

Explore Kratos residential solar systems

Calculate solar generation for postcode 2259

Explore Kratos solar panels and inverters

A smart solar-and-heat-pump setup is less about adding more equipment—and more about making the equipment you have operate at the right time.