How do I check my Solar panels are working?

First you should check the isolators (likely in the loft), and circuit breaker (in the fuse box/consumer unit marked PV or Solar) are turned on. The builders sometimes forget to turn them on. The inverter screen (again likely in the loft) may not be lit up if there isn’t enough sunlight currently.

Secondly, you will need to register for an export tariff or Smart Export Guarantee (SEG) with an energy provider. This does not need to be the same as your electricity provider. Octopus for example provide export tariff’s higher than the base SEG rate. You will need the installation documentation (MCS certificate) which you should receive from the builder.