Scally wrote:I pay £12 a month for gas in the summer months - which is used purely for hot water. Those are the months I get lots of solar power.
My winter gas bills are £120 a month: that's when I need a lot of central heating, and there is almost no solar at all.
I'm afraid that Sunamp would save me around £100 a year, maximum, so the payback is 30 years.
I will look further at heat exchange systems - air or ground: they appear to have better potential.
I would also love to use my Leaf battery to power my home in the evenings, saving up to 50% of my electricity costs.
Erm... I have two issues with this.
1) Do you really get no power from your solar system during any of the days when you also require central heating? I was under the impression that solar PV still gave a moderate output in winter, and pretty good in spring and autumn.
2) I don't get how powering your home from your Leaf could save you money, unless:
a) You plan to charge the car using free public charging, then drive home and use the power to run your house. Less said about that the better! or...
b) You have (or switch to) Economy 7, where you could also probably save a significant amount by charging a Sunamp from an off-peak heat-pump and using it during peak times!