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I was hoping for more before you left. Nothing in your argument or information demonstrates a good economic reason to install solar and batteries.

You said you can’t use overnight electricity, but...

Is that literature/promotional information or based on your actual data?

Interested to know as I have considered the option, couldn’t get it to work and would like to hear other peoples numbers....

I definitely wasn’t having a go at your brother. Sounds like a his customers won’t or don’t want to listen to his advice.

Like putting a small gas boiler in a very large house.

The trouble is...

They are a disappointment in a poorly insulated house because the heat pump and radiator capacity has not been sized correctly. That can be sorted out with a proper appraisal and optimised...

Sounds good. You can’t shift your major usage overnight, so what you have looks like a great set up.

However long it takes to payback, you will be safe in the knowledge it will, and then will give...

Glad it seems to work for you. But I'd be interested in hearing annual savings rather than snippets of one to two months, and how much your installation cost.

With 18 panels and 10 kW battery(?),...

And without a £5k battery you at an outlay of £7k but mostly feeding in more at 18p/kWh than you can consume at 28p/kWh. Let’s say an average of 20p/kWh when you take some usage into account.
...

4kW solar battery arrangement for approximately £12k (£5k battery, £1k inverter, £6k solar panels).

A typical 4 kW solar system will generate 2850 kW per year in ideal conditions (Yorkshire -...

What is the point of solar then? Even a small to medium size set up is £5k+.

Just harvest in batteries at 9.5p/kWh overnight and sell back at 18/30p/kWh.
As always do your maths very carefully...

Horses for courses and solar and batteries would be equivalent to burning £50 notes for me.

80% of my electricity is now consumed at night (EV, tumble dryer, washing machine and dishwasher) at...

You can’t change the laws of thermodynamics, and this is where people need to do their homework.

With mid winter temperatures you are never going to get a COP much above 2.5 whatever system you...

This is the crux of the matter. Even with a gas boiler not achieving 100% efficiency, with a COP of 2 and leccy costing 4 times more than gas per kWh, utility bills are going to be double that of...

Sorry, can’t help, but someone will be along shortly I am sure.

Just in case you hadn’t thought of it, plenty of experience on YouTube, and seem to remember Skill Builder has some recent stuff on...