According to the voltage of the battery, the controller will adjust the charging current and decide if necessary to supply power to the load, keeping the battery on full voltage condition. Also prevents the battery from over-charging or over-discharging and prevents re-flow of current back to panels at nighttime.Price: $29.99
A nice small, economical controller for 12V solar panels that produce less than 4.5 amps. Uses the same high performance circuitry as the more expensive SunSaver line. Epoxy encapsuated for marine environments. Easy to connect.