Storage from the Sun

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When I wrote this post last month, I mentioned that we were getting a battery system for our solar panels.

Well, the installation was completed on Tuesday afternoon and since then all of our electricity consumption has been independent of the grid.

As well as the battery system we also have more panels.

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This is the cabinet which holds the batteries.

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Inside, it looks like this.

003The interesting thing about the system which we have is that it is a hybrid system.  In fact, we really have 2 banks of solar panels – the original ones which we have had for 5 years remain connected to the grid and any power generated is fed back to the grid with a monetary return to us.  The only things that we have connected to this system are the oven and a single outdoor power point.

Everything else is powered by the solar panels of other system during the day and at night by the excess which is stored in the batteries.

This also means that we can power our home from the batteries (except for the oven) during any periods of power outage.

Following the completion of the battery installation on Tuesday, we have had four brilliant, sunny days.  The screen shot below shows our generation and use and tells the story clearly and simply.

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This shows the last month and each bar is one day.  The yellow bar shows the solar generation, the green line is power exported to the grid, the red line is our consumption and the black bar is power drawn from the grid.  The last 4 days are since the battery system has been operational.  Our solar generation is higher (we now have more panels), 100% of what we generated from the grid-connected panels was exported to the grid and most importantly, we have not used any power from the grid.

I know that every day will not be clear and sunny nor will we have as many hours of daylight as we are getting at the moment as we head towards the summer solstice.  However, we are confident that we will continue to be able to supply our power needs independently of the grid.

There are numerous new technologies available for battery storage systems so it would pay to very carefully consider your circumstances before rushing into a decision like this.  However, if you live in Australia and are interested in more details about our system please email me and I can get some information for you.