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12v lead-acid battery charger for 15-36V photovoltaic cells UNDER DEVELOPMENT source: https://github.com/rodan/solar-charger author: Petre Rodan <email@example.com> license: GNU GPLv3 Features: - an MSP430F5510 uC controls all aspects of charging a 12v Pb battery - programming either via spy-bi-wire or usb (untested) - logging capability to a uSd card - backup 3v Li cell for keeping the RTC up-to-date - analog readout of battery voltage, input voltage, charge current, thermistor temperature, internal temperature - possibility to stop the charge if a condition is met - 8 status leds for verbose blinkiness - very low quiescent current rev1 used a LandStar charge controller that got replaced in rev3 with a PB137ACV ic