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tony541 wrote: »
If a bank of panels plus a 10kw battery system was say £10000, which is probably too cheap a price, then how many years would it take to break even.
Martyn1981 wrote: »
That's probably doable today. A 4kWp system for £5k, plus £5k for a Tesla PWII (at reduced VAT rate). Assuming a decent discount from the installer for having both.
Break even, if we ignore lost interest (naughty, but I'm tired).
Then around £500pa from FiTs, export and leccy savings, so 20yrs.
I appreciate that this is not great, but it's still early days for batt storage, prices will fall both from expanded production, and reduced install costs ...
zeupater wrote: »
It's almost certainly the case that (even with the much reduced FiT rates) installing solar PV would provide the homeowner with more energy flexibility and a better ROI than solar thermal would, even if accessing the RHI scheme. Z
silverwhistle wrote: »
I haven't read your link, but I'd add that putting in cabling is a lot easier than retrofitting piping.
I get hot water from solar (looking forward to tomorrow's forecast sun!) by the simple expedient of an electric immersion heater in an existing tank. Solar hot water would have been a real pain.
... Photovoltaic and proportional diversion technologies have seriously eroded the base domestic hot water provision market position and the provision of affordable and justifiable battery storage systems will accelerate this process. Apart from a few cases where maximising performance over a limited area is important, unless the installed costs of UK solar thermal are seriously reduced over the next few years, it's highly likely that the market for the product will collapse, this likely being the case in many high-latitude countries ...
pile-o-stone wrote: »
Do you have a pressurised solar thermal system Z? Does the pressure ever have to be topped up and do you have to refresh the antifreeze inside the pipework? I read a report on solar vs thermal and the major point for me was the ability to use the generated energy from PV for something more than just heating water, the other points in the article were about the ability for solar thermal to 'destroy itself', where it either freezes in winter or boils in summer and that maintenance was a lot more than the 'fit and forget' of solar PV. I felt that this was probably a little overblown and would be interested to know if this is actually an issue?
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