A farm family wants daytime power for a remote pump with no utility lines, no need for night use, and the lowest cost and upkeep. A vendor proposed batteries and a backup generator. Which system type match fits this customer scenario with cost and maintenance limits?

A PV-direct system without batteries best matches the stated use: the pump operates when the array produces power, utility lines are unnecessary, and omitting batteries avoids a major purchase and recurring maintenance. Daytime-only pumping also means there is no need to store energy for evening use; water can be pumped when sunlight is available. A standalone battery-based system can serve an off-grid pump, but its battery bank adds initial expense, inspection and replacement needs, contrary to the lowest-cost, lowest-upkeep priority. A PV-generator hybrid is a familiar way to improve off-grid reliability, yet the generator adds equipment, fuel and service requirements that are unnecessary for the stated daytime-only load. An off-grid PV array with an inverter can run a conventional AC pump during daylight, but the inverter adds conversion equipment, cost and a potential maintenance point compared with a suitably matched direct-drive arrangement. Exam caveat: PV-direct output varies with irradiance, so the pump may deliver less water in cloud or early/late daylight; this is not the same as requiring batteries. Practical check: verify the pump’s voltage, starting characteristics, required flow and total daily water demand against the array’s expected output for the site and season, and confirm whether a water-storage tank can accommodate variable production.