How much electricity will your solar panels actually produce? It is the first question most homeowners ask, and the answer depends on a handful of straightforward factors: panel type, system size, where you live, and how much sun hits your roof.
For homes on the Mid North Coast, the numbers are encouraging. Port Macquarie averages around 4.5 to 5 peak sun hours per day across the year, which puts it well above the national average for solar production.
What Affects Solar Panel Output
Solar panel output is not a fixed number. It changes throughout the day, across seasons, and from one installation to the next. Here are the main variables.
- Panel wattage – Each panel has a rated wattage (e.g. 370W, 415W, 440W). This is the maximum output under ideal lab conditions.
- Number of panels – More panels means more total capacity. A 6.6 kW system typically uses 15 to 16 panels rated at 415W to 440W each.
- Sunlight hours – Peak sun hours (PSH) measure the equivalent hours of full-strength sunlight per day. Port Macquarie averages 4.5 to 5 PSH.
- Roof orientation – North-facing roofs in Australia get the most direct sunlight. East and west-facing panels produce around 10% to 15% less.
- Roof pitch – The ideal tilt angle for the Mid North Coast is roughly 25 to 30 degrees, close to the latitude.
- Shading – Even partial shade from trees, aerials, or neighbouring buildings can drop output significantly.
- Temperature – Solar panels lose efficiency as they heat up. A hot summer day can reduce output by 10% to 15% compared to a cool, clear day.
Panel ratings are tested at 25 degrees Celsius in a lab. Real-world conditions on a 35-degree day in Port Macquarie mean your panels will produce slightly less than their rated wattage.
Panel Types and Their Efficiency
Not all solar panels are created equal. The type of cell technology directly affects how much electricity each panel generates from the same amount of sunlight.
| Panel Type | Efficiency Range | Typical Use | Cost |
|---|---|---|---|
| Monocrystalline (PERC/TOPCon) | 20% to 23% | Most residential installs in 2026 | Mid to high |
| Polycrystalline | 15% to 18% | Budget installs, older systems | Low to mid |
| Thin-film | 10% to 13% | Commercial roofs, curved surfaces | Low |
| N-type / HJT | 22% to 25% | Premium residential | High |
Most systems installed on the Mid North Coast today use monocrystalline panels with PERC or TOPCon cell technology. These offer the best balance of performance, durability, and value for residential rooftops.
The older polycrystalline panels (the blue-tinted ones) are rarely installed now. If your system is more than 8 years old and uses polycrystalline panels, upgrading to modern monocrystalline panels can increase production from the same roof space by 20% to 40%.
How to Calculate Your System’s Daily Output
The formula is simpler than you might expect. You only need two numbers: your system size and your location’s average peak sun hours.
Daily output (kWh) = System size (kW) x Peak sun hours x Performance ratio
The performance ratio accounts for real-world losses like heat, wiring, inverter conversion, and shading. A well-installed system typically has a performance ratio of 0.75 to 0.85.
- Example 1: A 6.6 kW system in Port Macquarie with 4.7 PSH and a 0.80 performance ratio produces 6.6 x 4.7 x 0.80 = 24.8 kWh per day
- Example 2: A 10 kW system with the same conditions produces 10 x 4.7 x 0.80 = 37.6 kWh per day
- Example 3: A 13.2 kW system produces 13.2 x 4.7 x 0.80 = 49.6 kWh per day
These are annual averages. Summer days will produce more (up to 30% above average), while overcast winter days will produce less.
What Common System Sizes Produce
Here is what you can expect from the most popular residential system sizes on the Mid North Coast, based on average conditions.
| System Size | Daily Average (kWh) | Annual Average (kWh) | Suits Household |
|---|---|---|---|
| 6.6 kW | 24 to 26 | 8,800 to 9,500 | 2 to 3 people, low to moderate usage |
| 10 kW | 36 to 40 | 13,000 to 14,500 | 3 to 4 people, pool or AC |
| 13.2 kW | 48 to 52 | 17,500 to 19,000 | Large family, EV, high usage |
These figures assume north-facing panels with minimal shading. East/west splits or partial shading will reduce these numbers by 10% to 20%.
Seasonal Differences on the Mid North Coast
Solar production swings with the seasons. Longer days and higher sun angles in summer mean more energy, while shorter winter days bring the numbers down.
- Summer (Dec to Feb) – Peak production. A 6.6 kW system can produce 30+ kWh on a clear day. Days are long, with sunrise before 6am and sunset after 7:30pm.
- Autumn (Mar to May) – Production drops gradually. Still strong output, averaging 20 to 25 kWh daily for a 6.6 kW system.
- Winter (Jun to Aug) – Lowest production. Shorter days and lower sun angles bring a 6.6 kW system down to 15 to 18 kWh per day.
- Spring (Sep to Nov) – Production ramps up quickly. Clear spring days can match summer output, especially in October and November.
Port Macquarie’s coastal climate helps year-round. Winters are milder than inland areas, cloud cover is moderate, and the region gets more consistent sunshine than Sydney or Melbourne.
Why Real Output Differs from the Rated Wattage
Your 6.6 kW system will almost never produce 6.6 kW at any given moment. That rated figure is tested under Standard Test Conditions (STC) in a lab: 1,000 W/m2 irradiance, 25 degrees Celsius cell temperature, and zero shading.
In the real world, several things eat into that number.
- Heat – Panels lose about 0.3% to 0.5% of output for every degree above 25 degrees Celsius. On a 40-degree day, that is a 5% to 7% loss.
- Inverter clipping – A 6.6 kW panel array paired with a 5 kW inverter will clip output on peak production days, capping generation at 5 kW.
- Wiring losses – DC cable runs from panels to inverter lose a small percentage of energy as heat.
- Soiling – Dust, dirt, and bird droppings reduce the amount of light reaching the cells.
- Degradation – Panels lose roughly 0.5% of capacity per year. After 10 years, output is typically 95% of the original rating.
Adding a Battery Changes the Equation
Solar panels only produce electricity during daylight hours. Without a battery, any power you do not use immediately gets exported to the grid for a feed-in tariff (currently 4 to 8 cents per kWh in NSW).
A battery lets you store that daytime production and use it at night, when grid electricity costs 25 to 40 cents per kWh. This does not change how much energy your panels produce, but it changes how much of that energy you actually benefit from.
- Without battery: typical self-consumption of 30% to 40% of production
- With battery: self-consumption jumps to 70% to 90%
- The financial benefit of each kWh produced increases significantly when stored and used rather than exported
Get an Accurate Estimate for Your Home
Online calculators give rough estimates, but every roof is different. Shading patterns, roof orientation, available space, and your household’s energy usage all affect the right system size and expected output.
SolaXs has been installing solar systems across the Mid North Coast for over 25 years. We assess your roof, your usage, and your goals to recommend a system that matches your actual needs, not a generic estimate from a website.
Get in touch for a free, no-obligation quote tailored to your property in Port Macquarie or anywhere on the Mid North Coast.
What This Means for Mid North Coast Homeowners
The Mid North Coast is one of the best regions in Australia for solar. With around 5.2 peak sun hours per day and rising electricity prices, the numbers keep improving for homeowners who go solar.
- High solar yield: Port Macquarie, Coffs Harbour, and surrounding areas receive consistent sunlight year-round. Even in winter, a well-sized system produces enough to cover most daytime usage.
- Rising grid costs: Electricity prices on the Mid North Coast have increased by more than 20% over the past three years. Solar locks in a fixed energy cost for 25 years.
- Strong feed-in tariffs are gone: The days of generous feed-in rates are over. Self-consumption is now the key to savings, which makes system sizing and battery storage more important than ever.
- Local installers matter: When something goes wrong, you want an installer who can be on your roof the same week, not a company based in Sydney or Melbourne.
SolaXs has been installing and servicing solar systems in the Port Macquarie region for over 25 years. Get a free quote tailored to your property and energy usage.
For more information, see the Clean Energy Council buying solar guide and the Australian Government Small-scale Renewable Energy Scheme.