Autogardner variants are available in electric version, the major difference in SOLAR powered is, it has inbuilt lithium ion cell installed, based on the device variant- we have designed the solar panel for fast charging with over volt, over current & auto cut off charging when fully charged making it long life
(eg;- lets say you have T1H, you tuned in 15 mins of water a day, 15 mins will consume 20% battery, and during the day time).
All solar autogardner devices are designed to charge from 0-70% within 3 hours of direct sunlight.