Advanced working knowledge of residential solar and battery architecture and operation, including modules, stringing, optimizers, microinverters and string inverters, batteries, rapid shutdown, gateways, meters, communications, monitoring platforms, electrical interfaces, commissioning, and common failure modes. Experience interpreting contractor workmanship and manufacturer warranties; evaluating homeowner claim validity; managing OEM support, claims, RMAs, escalations, and reimbursement recovery; and distinguishing product, installation, workmanship, utility, and customer-paid responsibilities.