Both of these have contributed significantly to reducing costs in our home.
The PV system is 1.2kWh. Our daily use is around 5kWh during winter and 6kWh during summer.
The difference is because in summer we need to use the ceiling fans more to circulate air - a problem that will be solved when we install opening windows on the southern side of the house to allow for cross-ventilation (north to south).
The solar hot water system has been a god-send. It's wonderful to know that your water is being heated by the sun.
Our PV system is grid-connected so we feed energy into the system at a higher price than what we 'withdraw' it from the system for. We offset any difference in energy use by buying 100% green energy. That means our house energy use is carbon neutral - zero carbon emissions - which is great.
We also save money firstly by reducing our energy use, then by using alternative systems (the PV system for example) and finally by off-setting the difference. This is a great recipe for reducing costs generally.
Now all we need to do is ensure the roof space doesn't get too shaded by nearby vegetation!
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