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Many so-called MPPT controllers on the market lower than $30 cannot reach >99% tracking efficiency beause we had tested them. Even worse, when you look at the result list by searching MPPT solar charge controller, many of them are cheap PWM controllers, they are hiding MPPT and PWM words on the product and listing to let customers forget it’s a MPPT or PWM controller. The GreeSonic MPPT1575 controller promise the tracking efficiency >99% and the charging efficiency is about 20% higher than the traditional PWM controller, which can make the cost of the whole system much lower! What’s more, it’s the most compact, warterproof, simple-operated and best price MPPT controller. Features: * Externally installed temperature sensor is capable of high-accurate temperature compensation. * 12V/24V system voltage automatic recognition, * Strong and durable aluminum case,IP67 waterproof * Can see Various kinds of status indicationand running status (led indications and faults &alarms) * Protection againse over-charge,over discharge and overload, protection against electronic shortcircuit and reverse connection. * TVS lightning protection. * MPPT charge mode (SOS). Technical Data: * Max Charging Current:15A * MPPT Charging Voltage:* Overcharge Protect:15.5/31.0V * Reconnect Voltage:11.4~12.8V/22.8~25.6Vï¼Programmableï¼ * Max tracking efficiency:>99.9% * Max charge conversion:97.0% * Self consumption:6mA * Ambient temperature:-35~+60â * Max Altitude:4000m * Weight:600g * Dimensions:85.8 x 145 x 30mm Note: 1.Please connect to the battery first when you operate the system. 2.Battery must be protected by fuse, otherwise battery willbe damaged. 3.The PV panel voltage should not exceed 60V for a long time. 4.Keep the children away from the solar system.