While designing the solar module layout, the main goal in mind was to maximise the available roof space, as this new-build was going to rely almost entirely on electricity for their energy needs. On top of that, we had to ensure that the panels were not visible from the front of the house and that there would be enough space left around the panels for cleaning and maintenance.
In the end, we were able to install 8 rows of 8 x 415W LONGi solar modules, giving us a total of 26.56kW of PV generating power.
To achieve the highest level of power generation from the roof space, we chose to install the panels at a tilt of 22 degrees, with half of the panels facing North-east and half facing South-west. The result is a "concertina-style" installation, that not only looks good, but generates power from sunrise to sunset.
To accommodate for the 26.6kW of PV power, we've combined two Sungrow 3-phase inverters; a 15kW grid-connected inverter and a 10kW hybrid inverter, for a combined total of 25kW inverter capacity.
Connected to the hybrid inverter is a 19.2kWh Sungrow HV LFP DC-coupled battery. This battery has taken into account the general household consumption and has been sized to adequately supply power to the house during the night and in times of heavy cloud cover.
Additionally, a 10kW uninterruptible power supply (UPS) has been included to provide constant power to the house, even during blackouts and grid outages. Unlike AC-coupled batteries (e.g TESLA), this system has the ability to continue charging the battery if there is no grid power during the day, protecting the house from multi-day blackouts.
Over the course of a calendar year, this system will produce over 33MWh of clean electrical energy. This equates to roughly 91kWh of energy generation per day, adequately providing enough energy for the 18kWh of average daily consumption within the house, while also putting excess power generation to good use.
When the battery is full and the house is being adequately supplied with solar power, the excess energy will be fed into the grid to power a number of houses in the local area.
The average Melbourne household consumes around 12.3 kWh of electricity per day. This means that this system has enough generating capacity to power over 7 homes.
When the customers made plans to extend their home, they designed their new roof with solar in mind. They made the wise decision to ditch their gas appliances and electrify their entire home. They designed the roof with a slight north-facing pitch, which maximises generation.
Ditching gas and investing in a clean, renewable and direct source of energy means that they were able to say goodbye to their $200 quarterly gas bill and stop worrying about ever-increasing gas prices. Installing a solar system of this size also resulted in waving goodbye to their electricity bill. In the first 6 months since the installation, they have been in credit on their bill, saving over $1500 already off electricity costs.
To accommodate for the 25.7kW of PV power, we've combined two Sungrow 3-phase inverters; a 15kW grid-connected inverter and a 10kW hybrid inverter, for a combined total of 25kW inverter capacity. Connected to the hybrid inverter is a 9.6kWh Sungrow HV LFP DC-coupled battery.
Additionally, a 10kW uninterruptible power supply (UPS) has been included to provide constant power to the house, even during blackouts and grid outages. Unlike AC-coupled batteries (e.g TESLA), this system has the ability to continue charging the battery if there is no grid power during the day, protecting the house from multi-day blackouts.
With such a large north-facing roof, this system will generate 36MWh per year, which equates to just under 100kWh of energy generation per day on average. This will provide more than enough energy for the customer's average household consumption of 27kWh per day, while also putting excess power generation to good use.
When the battery is full and the house is being adequately supplied with solar power, the excess energy will be fed into the grid to power a number of houses in the local area.
This system has enough generating power to supply electricity to 8 standard Melbourne homes.
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