If you have a Solax inverter attached to your solar panels, and get your energy from Octopus, then you can now calculate your earnings using live tariff data in the Solax app. I gather this feature has been there for a few months, but I’ve only recently found out about it. Here’s how to set it up.
Firstly, open the SolaxCloud app. On the home screen, tap the Earnings section. At the top right, you should see an icon that looks like a calculator with a lightning bolt on it, so tap that. You’ll now see two tabs – ‘To Grid’ and ‘From Grid’.
Get your Octopus API key
Before we continue, you’ll need to generate an API key. Log into your online Octopus Energy account (on the web, not on the app). At the top, it should say ‘Hi, [your name]’, display your account number, and then show a link called ‘Personal Details’. Click that link.
You should now see several boxes, one of which is called ‘Developer settings’. Click the ‘API access‘ button.
Scroll down a bit, and you’ll see a box labelled ‘Your API key:’. Copy this key, and preferably save it in a password manager. You can only have one API key, but you can use it for multiple things – I use my key for the Octopus Energy integration for Home Assistant, for example. You can regenerate your key, but it’ll invalidate your previous key, and you’ll only be shown it once on the Octopus web site. That’s why it’s best to treat it like your password.
Whilst you’re on Octopus’ web site, make a note of your account number too, as you’ll need this in a moment.
Enable automatic tariff setting
Back to the SolaxCloud app. Below the ‘To Grid’ and ‘From Grid’ tabs, you should have two further tabs: ‘Customized’ and ‘Automatic’. Tap ‘automatic’.
A new box called ‘Tariff provider’ appears, so tap this, and select ‘Octopus’. There’s another option called ‘Nord Pool’ which may work if you use a different energy supplier. I don’t, so I’ve only tested this with Octopus.
Now, you’ll have two options: ‘API Key’ and ‘Select a package’. ‘Select a package’ lets you manually choose your tariff and region, but it won’t update automatically if you change your tariff. So, we’ll select ‘API key’. Here, enter your account number, and then the API key, and tap ‘Save’. You should find that your current tariff and meter point access number now appear in the app. Scroll down, and you’ll be able to see the underlying tariff data, both as a graph and the raw data.
I’m on a fixed tariff with Octopus, so at present there’s no fluctuation with my import and export prices. However, if you’re on a tariff such as Octopus Agile, you’ll now see this data in the SolaxCloud app. What’s more, any future earnings will be calculated using this tariff data, and so it’ll more accurately reflect how much money your solar panels and/or battery are saving you.
Join Octopus
Octopus is now the UK’s largest electricity supplier, with a market share of 22%. And, with features like API access, the chances are that if you’re geeky enough to read this sort of blog post, then you’re already signed up. However, if not, here’s my referral link – you’ll get £50 off your first bill if you sign up. Financial incentives aside, of all the energy companies that I have used, Octopus have had the best customer service by far.
