01
Calculation
What annual generation and self-consumption have you assumed? Which method, site inputs, tariffs and loss factors support the figures?
02
Certification
Can you confirm your MCS certification number and, separately, whether you hold RECC membership? Both can be checked independently against the schemes' own registers.
03
Delivery
Who surveys, designs, installs and commissions? What is subcontracted? Who handles planning and grid steps, and what could change the price?
04
Aftercare
Who monitors faults, who attends, what response is promised, which warranties include labour and access, and what happens if the installer stops trading?