MCS

MCS (microgeneration certification scheme - https://mcscertified.com ) is a strict industry standard that is applied to small scale energy production (your solar pv system is effectively a small power station!) and is designed to maintain high standards in the industry and hence protect consumers. From the UK.gov website ..

https://www.gov.uk/government/publications/microgeneration-

certification-scheme-mcs-transfer-

to-mcs-service-company

‘The Microgeneration Certification Scheme (MCS) certifies, quality assures and provides consumer protection for microgeneration installations and installers. These consist of small scale renewable electricity technologies such as solar PV, biomass, wind, heat pumps and heat products.’

You should always make sure your installers are MCS certified (you can check on the mcscertified.com website above) as eg if they are not then you cannot get paid by your energy company to export any excess energy you produce to them.