Yes! Our optimisation remains the same. Solar smart charging is never more expensive than regular smart charging. As shown in the figure below, we will schedule when it is greenest and cheapest. If you're solar smart charging, this may be when it is sunniest - but it may still be cheaper overnight.

Because we scale the price based on local (home) solar production, we respect any price thresholds that have been set.

For example, let's say your solar panels produce 50% of the energy used to power your vehicle and you're on the Octopus Go tariff. In this case, your electricity costs 15p per kWh except between 00:30 and 04:30 where it costs 5p. If you set a price threshold of 10p, you charge during your “off-peak” window where electricity costs less than 10p. But if you turn on solar smart charging, we factor in the the impact of solar production on cost. And we only charge when your solar setup produces enough energy so that your effective costs are below the price threshold.

In this scenario, your effective costs of charging with 50% solar power and 50% grid electricity are 7.5p per kWh. We know that costs 5p during the overnight off-peak window. Using that cheap energy is our priority, so we will fill those slots up first. Then if your car needs more time to charge, we schedule the remaining time (according to our algorithm) solar production will be at its highest. But we'll only use your solar power if the effective price is below the price threshold.