A 2 kW solar system is less common than some of the other size systems. Since it is more adept at meeting the energy needs of smaller households, the additional special requirements of a 2 kW system over a 1.5 kW system can sometimes prompt people to go for the smaller 1.5 kW size.
Some key system details are as follows:
|Average Price ($)||How many panels?||Average Energy Generated Daily (kWh)|
|$3,200 – $5,300||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.
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.
If we put all this together and look from a financial point of view, then the payback period for a typical 2kW solar system would be between 4.75– 7.5 years. In all likelihood though, if we take average pricing and energy use and also take into account the rising cost of electricity you’d be looking to be in the black by around 5.5 years.
These figures are based on the fact that you offset your energy usage by not having to buy power from the grid. So for every unit you don’t pay for from the grid you save yourself about $0.22. This may not sound like much but over a year that adds up to about $670 on a 2 kW system. These savings only increase if (when) the price of electricity increases.
For placing the panels of a 2 kW system you have look at what your own energy use is like. 2 kW 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.