Long before 2005, Heavy Duty Actuator GRA-1500(QAPL+) (SuperJack brand) was applied to push/pull solar panels in Germany, Spain. And, we also saw our ZARL+ in solar trackers in USA markets. This is the early period for our new application in Europe and America.From 2007 on, G-ROCK has been launching a series of linear actuators which are specially designed for solar/sun PV trackers, there has customized hand drived one, AC powered one, one motor drives 4 linear actuators one...   hereof we'd like to recommend one of our mature models D18 series. Its dynamic load 20,000N, static load 40,000N, IP66, outer parts of corrasivity category (ISO 12994-2) is C3~15yrs, salf spray test more than 800hrs. It's a reliable solutions to PV tracking applications.