Current guidance does not allow installation in a roof space, and limits capacity to 40kWh in most houses (80 kWh in detached or separate garage). Guidance, not law iirc.

But they are so heavy I would not place them on ceiling joists, I’d want them on a concrete floor

Time of use tariffs have low import costs than the price Octopus will pay for export, so it’s actually better to export solar production than to self consume, so your first advice is inaccurate.

In the UK any new electrical circuit, which includes an EV charger, solar DC/AC inverter, cooker or lighting circuit etc is notifiable work and must be completed by a part P registered professional.

It doesn’t matter if it’s a self install of an inverter that can be zero rated for export, if the house consumer unit is connected to the national grid you can’t self install (unless you are a registered professional as stated). Essentially to connect solar panels to a house that is also connected to the grid will always have to use a grid tied inverter.

Only way to use an off grid inverter, which is what you described, is if the house is entirely off grid (and therefore has it’s own earth which is another point but not really worth going into). The description of an off grid inverter you use would not be the definition used in the UK in relation to building regs (it would be a grid tied system because it is connected to the grid, pass through is irrelevant).

Yeah I ran my car until the engine light came on and swapped later on. It’s fine, no point trading in unless you can get a good deal IMO.

Personally, I’d ask for a quote with a different battery, that looks to be overpriced compared to others so extending the battery size will be more expensive than it should be.

Check the quote which should state which battery is supplied, then one of the general suppliers, itstechnology, bimble solar etc.

A battery installation should be zero vat, so a single 4.8kWh US5000 Pylontech battery is like £720 ex vat These are 15 cell batteries and they are essentially plug and play. Some batteries are 16 cell batteries so have a little more power stored but seem to cost a lot more. Can’t mix and match batteries of different numbers of cells.

The batteries should essentially be supplied at cost, there is zero work to install more.

Decent price TBH. Should pay back in 5 to 8 years with the bigger battery and the right tariff (I think the best tariff is Intelligent Octopus Go and the fixed export tariff, ~15p/kWh export, but 7p/kWh cheap rate import, and need an EV)

If I were doing this all again I’d use Victron inverter kit with the self build batteries (Fogstar do a decent kit), for an entirely self hosted control system, and whatever panels fit the roof space best. But 180W is nothing to worry about. More important to find a second area for another array.

Oh, and you will want a hell of a lot more than 5kWh worth of battery storage. I have 14kWh and run low in winter when the panels make naff all (charge on cheap rate power to last all day)

Unless you are a part P registered electrician it is unlawful to connect an inverter to the consumer unit (and hence the grid) in the UK.

Also, the feed in tariffs in the UK are highly competitive.

Sure, it’s possible to get the panels bought and installed and wired up as a DIY project but that’s about it.

Dissertation title: the use of self hosted technological solutions for stress management in off duty nursing staff

Ie why torrenting media is the only way for poorly paid nurses is a sign of the breakdown in the social contract

Or, and this is one I’ve been thinking about, The use of patient data in health organisation owned AI systems and consent: What happens when children say no