Homeowner Blog

Britain will see its deepest solar eclipse in decades this evening, with as much as 96% of the sun blocked by the moon in parts of the country, the closest the UK has come to totality since the total eclipse over Cornwall in 1999. The dip lasts around two hours and will barely register on a typical home solar system's annual output, since the effect behaves much like a passing bank of thick cloud. It matters far more to the national grid than to your roof, which is why Octopus Energy is running a UK wide power down session between 6pm and 8pm tonight.

The installed price gap between the Tesla Powerwall 3, Sigenenergy SigenStor, and Fox Evo is under 4% when measured on cost per usable kilowatt-hour of storage. Spirit Energy has installed all three, including the first Powerwall 3 commissioned in the UK, and the honest conclusion is that price alone should not drive this decision.

Why do we have to apply for permission to connect to the grid?

When you install a solar/battery system larger than 3.68kW per phase, you must submit an application, usually G99, for permission to connect the system from your local Distribution Network Operator (DNO). Most solar installers will do this application on your behalf, usually after you’ve settled on a final system design. 

Powerwall has been around for almost six years now, and one of the reasons we like it is that Tesla is always innovating and improving the product. Often, this comes in the form of over-the-air updates to the battery’s software.

The latest feature is the ability to take your Tesla Powerwall off-grid and supply your home as if there were an outage. This has launched alongside the news that Powerwall is now suitable for off-grid installations. Read on to find out more about both…

"Can I go off-grid with solar?" is a question we are asked at least once a week. When the Big 6 hike electricity prices, make that once a day.

It's a particularly enticing proposition, especially if you are 'self-building' your dream home and aiming for PassivHaus standards and Grand Design prizes.

The short answer is "Yes you can go off-grid with solar."

A better answer is "Don't do it unless your grid connection is really expensive." Instead, make the grid work for you by taking full advantage of time-of-use tariffs (off-peak charging).

To illustrate our better answer, we've modelled an off-grid residential property with an annual electricity consumption of 5,000 kWh.