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Absolutely, it has to be done by a certified installer. My point was that it does not have to be the "expensive" solution frequently offered with specialist control gear, the actual requirement of not being able to be linked to both supplies at once can be met quite simply.

If you can get past expensive installer double speak then it's not that complicated. As has been suggested a separate CU with the dedicated essential circuits on it. i.e. lighting, heating pump and boiler, a few key sockets on their own ring remembering that the standby power will be limited so...

I suspect everything is automatic now but when an aircraft engineer we used to have similar problems with multi engine AC generators. On the engineers panel would be a set of dials not dissimilar to a compass. If a generator was off line its dial would be spinning furiously. As it came up to...

And according to the Energy Saving trust the "typical" household could look to save around 20% of their electricity bill.

I have seen panels mounted on frames at the far end of a north facing garden against the boundary fence mounted on frames on the ground. The fact that there would be a summer house underneath in technical terms would be irrelevant. The optimum angle depends on latitude but yes, around 30-35...

OK, Take an extreme. A good summers day and you are out. The solar panels are generating spare 3kW each hour and you have a 3kWh battery. So after an hour the battery is full and you are still exporting to the grid! For an 8 hr day you would need a 24kWh pack. When calculating the benefit the...

Then I would say you are wasting money on a battery system when you could just as easily plan to use the power as it is available. The benefit comes from diverting unused power into the sunless periods and are just about viable if you can plan to fill the battery every day and use it every night...

A more basic question which I haven' seen asked is are you at home during the day. I.e. would you make use of the solar output directly. We are retired and are at home a lot so the amount of "spare" energy is limited. The payback time for a battery system for us would far exceed the expected...

There are as has been said automatic devices that will clip onto the meter tails to try and detect any outbound current to divert it to the car. Great if you are not there but as a good retired Yorkshireman they are not cheap and hard to justify. So the Mk1 finger is a good substitute. However...

Even with solar and single rate tariff I couldn't get a battery system to pay for itself. I would love to expand the PV but that knocks out the FiT rate I am getting.

But if you are using the battery during the day then that is the same as using the panels, the best the battery will do is make todays dull day into yesterdays sunny one, only if you stopped them being used overnight.

No, the battery generates A/C for the house and the car is connected to the house so it would be charged from the battery. But do the math. Even if fully charged the 8.2kW battery is not going to do much for the car's 50kW+ battery and if you even did that then the house is going to pull power...

The battery storage is primarily designed to run the house after dark with the battery being charged during the day. I ruled that part out because we plan what we are doing specifically about the weather so sunny days are for batch cooking, washing and tumbling and charging the car if at home...