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Upgraded model: - Enhanced version designed for lithium batteries, featuring a heat sink and a USB charging port with a maximum output of 3A.Why you need this?: - With Overload, short circuit, open-circuit and reverse protection, the device will protect your battery from overcharge and deep-discharge, hence increasing the battery life.Battery Types: - This updated controller is suitable for all battery types. Make sure to select the correct battery type i.e B1 for lead-acid, B2 for Li-ion, B3 LiFePO4 / Lithium Ferro phosphate (LFP)Important: - Connect the battery first with the controller and then the panel. Connections should be in this sequence else the controller will not work.Note: - 12V solar panel will work with 12V battery only and 24V solar panel will require 24V battery. You can set float voltage (Float voltage is max battery charge voltage), discharge reconnect (Load on after this voltage), discharge stop (Load OFF on this voltage) and work mode (When you set hours setting then load ON after sunset automatic).Compatibility: Supports max 130W (12V) and 260W (24V) panels