2kW Solar Systems

This system is ideally suited to people whose bills have an average daily consumption of around 12-14 units per day. Typically, this would be a household of 2 – 3 people.

Some key system details are as follows:

Average Price ($) How many panels? Average Energy Generated Daily (kWh)
$3,000 – $5,000 8 – 11 (depending on panel size e.g. 190W) 8 units

* Note that the energy generated daily is an average for the year; in summer this will be higher but conversely in winter it will be lower. Also this is an average across all of Australia and so there will be a variation depending on exact location.

For placing the panels of a 2 kW system you have look at what your own energy use is like. 2kW systems can only be placed facing in one direction because of reasons to do with voltage on the inverter. The typical household has low load in the middle of the day when people are at work/school and a peak in the late afternoon early evening when everyone gets home. These types of households may benefit more from facing their panels in a more westerly direction to get the peak generation closer to the evening when the most power is being used.

However, if people are home during the day then it would be better to have your panels face as north as possible and peak during midday. In the end you want to maximise the use of the solar you generate in order to minimise how much you have to buy from the grid.

 
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Understanding Batteries

Off-Grid Systems

For some households a battery system can be of great benefit and minimise a home’s reliance on the grid. However, it’s important to understand for a battery to be useful your solar system needs to be generating excess energy for the battery to store, which you can then use at night or when the sun is not out.

When selecting a battery, you’ll want to invest in a system that is most suited to your home and can drive the best return on investment (ROI). Despite a larger upfront cost, a higher quality battery may significantly increase your ROI.

    Battery systems start from $6,000 and costs can vary greatly based on the following factors:

  1. Cycle Life-Time

    The number of times a battery can fully charge and discharge.

  2. Battery Power (kW)

    How fast it can be charged or discharged.

  3. Storage Capacity (kWh)

    The maximum amount of energy a battery system can store.

  4. Battery Management System (BMS)

    An electronic ‘smart’ system that gathers data and manages the battery ensuring it does not overload or operate outside of its safe functioning zone..

  5. Inverter

    Battery systems require their own inverter if your solar system does not have a hybrid inverter.

  6. 'All-In-One Unit’

    A system which includes the battery, BMS and an inverter all in one unit.

  7. Warranty

    Length of time or cycles the battery system is under guarantee.

  8. Blackout Protection/Backup

    It’s important to note this is not a common feature of a battery system and could cost thousands of dollars to include. Blackout protection not only requires additional components but also a specialised installation and rewiring. For grid-connected homes, the cost for blackout protection can outweigh the benefit.

Additionally, if your purpose for adding battery is to go Off-Grid and become completely independent from the grid you will need to ensure your solar system can generate enough energy to power your home and your battery system is large enough to store this energy. For homes in metro areas going Off-grid is not cost effective and is only recommended for those in remote areas with limited access to the grid. Off-grid solar systems with battery start at approximately $30,000.