Doesn't get me off the hook, since I am on FiTs already, but maybe I can flex my ethics*, and to that end today I had a very interesting conversation with SunAmp (http://sunamp.co.uk/) and I am sorely tempted to try out one of their pre-combi energy stores (http://sunamp.co.uk/products/sunamppv/). To my understanding their store should have essentially no standing losses beyond a 5W background consumption (being essentially phase-change) and at 4kW capacity should cover our typical daily DHW use from our PV in all but the depths of winter (3 months?). Not seasonal storage, and still suffers from my worries about waste of high-grade energy, but would cover half our household heat demand and not require masses of expensive insulation and have new and interesting H&S risks. And doesn't stop me doing something about the space heat demand later.
Halving my family's direct fossil fuel usage (eg gas) seems attractive.
And it would allow me to continue using my house as a test site for OpenTRV for another year! B^>
*Those are my principles, and if you don't like them... well, I have others.
Edited by DamonHD, 08 September 2015 - 09:33 AM.