MPPT Charge Regulators by Blue Sky Energy offer increased performance of your array by up to 30%. Utilize Maximum Power Point Tracking technology to allow the array to operate at it's peak power voltage while delivering output at your preferred voltage set point. Three stage charging algorithm uses net battery charge current optimized to battery size in amp-hours to determine when to switch from absorption to float. Many other controllers use a timing circuit to determine the switch point, which is less accurate. This product is available in 2 versions: The Solar Boost 50 for 12 or 24 volt systems and has a maximum output of 50A, the Solar Boost 30-48 for 24 or 48 volt systems has a maximum output of 30A. The digital display and temp comp options are included with the products listed below. UL listed. Limited 3 year warranty.