Gate Opener Solar Panel Sizing Calculator

Estimate the solar panel wattage a driveway gate opener needs based on daily cycles and sun-hours.

Common questions

What size solar panel do I need for a gate opener?: Most single-gate openers need 10–20 W in sunny climates and 20–30 W in cloudy or heavily shaded areas. Dual gates typically need 20–40 W.
Will a 5W panel keep my gate opener running?: Only for very low-traffic gates (under 10 cycles/day) in full sun. Most users find 5W insufficient and upgrade within a season.
How many gate cycles does my battery support before draining?: A typical 7Ah gate battery handles 100–300 cycles depending on gate weight and opener draw. Solar recharge should stay ahead of daily use.
Do I need a charge controller?: Panels above 10W generally need a small PWM charge controller to prevent overcharging the sealed lead-acid battery.
What if my gate is in the shade?: Oversize the panel by 50–100% and consider mounting it on a nearby post or roof with a longer 12V wire run — check voltage drop.