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Ask the customer to check their paperwork or count from outside if unsure.
Year installed or approximate number of years.
Has anything been replaced or added since install — panels, inverter, wiring?
Is the FIT registered in their name / are they receiving the payments?
The installation certificate they received when the system was first installed.
'Is the fuse box the original one, or has it been replaced at any point?'
Objections raised, customer concerns, best time to visit, who else is in the household...