➀ The article introduces a reference design for an MPPT-based solar battery charger, optimizing charging efficiency and battery life. ➁ The design uses Renesas ISL81601-US011REFZ solar battery charger board and RL78/G14 microcontroller. ➂ Key features include support for up to 40VIN and 60VOUT, and overcurrent, overtemperature, over/under voltage, and reverse polarity protection.