Tesla Powerwall2 – High Summer

This first screenshot says it all.

That’s it.

Brilliant.

Job done.

The weather for the past few weeks has been perfect for solar power – non-stop sunshine except for an overcast afternoon or so. Those clouds didn’t have much impact and performance has been as good as I could have hoped for.

If you need more evidence, here’s the weekly graph. There’s just the tiniest bit of grid draw – which I can explain – and apart from that it is life off-grid, day after day, week after week.

The reason for that grid draw, and the one fly in the ointment, is that the immersion heater failed and needed to be replaced.

When the Tesla Powerwall2 arrived I also had a Solic 200 unit from Earthwise installed. This diverts excess power from the solar cells to the immersion heater, and the advantage here is that I can turn off the gas boiler for hot water and so reduce mains gas use.

The problem was, the old immersion, unused for over ten years, gamely did its job for a couple of months then packed up. A quick replacement and we were back in business, but setting up caused a small draw from the grid.

For now the only fossil fuel used to run the house is for the oven.

This last graph shows the past month. The first week we were away on holiday, hence the lower house power demand.

It’s madly hot and the weather is set to continue like this for a while. So my next step is, now I can salve my conscience by running it for free off sunshine, is to get a small portable air-con unit.

~

 


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