The problem comes with fitting something like that. Most people (including me) would need it to be installed in such a way as to have automatic switching between stored power and grid which, combined with the roofing costs, would more than likely push the cost back up to circa £6k. Given the most I could theoretically get back (assuming full use of the stored power) would be £4K I am still running at a substantial loss.
Another issue is that, given the amount of batteries & additional electrics, I would imagine that insurance companies would be interested in knowing this had been fitted. Knowing most insurance companies,even if the risk is negligible, that knowledge comes with an additional premium (just look at how much and for how long motor insurers charged people additional premiums for fitting safer snow tires during the winter because they were "non standard").
I and I am quite sure a lot of others would love to adopt more ecologically friendly technology but cost atm is prohibitive.
An interesting analysis by Polly Toynbee in the Grauniad:
HMRC rang yesterday. The woman corrected us about might be leaving - we are leaving. After that the call was not all that well received and to be fair she didn't know shit about import/export. The magic EORI number seems to be the backbone of the bullshit. Getting one is about 15 seconds work and when you have it it makes no real difference to anything much. Then you need either to buy a zillion quid's worth of specialist software or use a forwarding agent. We have nearly run out of some stuff that comes from Sweden and reordered. It will arrive in early November so if we have left (doubtful) all will be revealed.
Our mission critical product for one company is a chemical that comes from France. We buy a pallet then split it down to the individual 20L containers. The manufacturer will only sell in pallet quantities and there is only us in the UK AFAIK that sells the individual drums. Our small business customers need one or two drums at most and cannot afford to buy the pallet, nor use it all inside the shelf life. It's a small niche market and we sit in it. After we leave we must go through the REACH declaration. Or maybe not. No one seems to know what the volume level for the new UK REACH will be. HSE will do UK REACH. Their website still shows that REACH for small importers will start 180 days after we leave. Presumably because their software in non existent at this time.
The current REACH system is run by ECHA and their software and training is about ten grand from memory. We stopped bringing in the South African products as it is too much hassle to comply. No details on the HSE costs at this stage.
So this poor unfortunate woman - presumably a call centre contractor - has to get her ear bent about things she knows nothing about. Are you ready? I don't know dear - what is happening? Look at the website. Yeah I have.
This is what your tax is spent on.
Yep, spotted that one myself and decided they had all the information on the company they need so they could just send us a login, yes.... Decided that after having spoken on the phone to 3 members of the Department for International Trade over the last 18 months (and having explained how import and export works to them) I probably would only get annoyed so won't bother attending.....