[edent]

Per year. And assumes electricity prices won't go up.

It took me half-an-hour to grab the CSV files from my monitoring, a write a scrap of Python to work out the difference in prices, then double-check my workings.

I'm happy with that ROI.

[michaelt]

What would your advice be to someone with no electric car, no solar battery, no solar panels, and no subsidy available on them? Is the smart tariff still a good deal?

[edent]

Depends on your usage patterns. If your job means you always get home after 7pm, or if you cook with gas, then it may still be worth it.

[jnty]

£60/yr would be a good saving for a supplier switch, the comparision and admin from which could easily add up an hour's work. A good ROI indeed!

[JazCE]

What do you use for monitoring your mains supply?

[edent]

The smart battery provides the monitoring. It is literally a clamp on the meter to monitor import and export, and one on the solar panel feed to measure generation. Small bit of Python to grab it ever 10 minutes.