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Hurray, it works. Fuel gauge reads about 70% full when LCD reads 50% SOC when using default value for max PWM. Pack voltage shows 7V less than actual, but I remember this being adjustable too. Thermal sensor inside 9" Kostov must not be compatible with this board as it gives 120C reading and lowers to 100C when in use. Good thing I bought two sensors mentioned in BOM. Some fine tuning and more permanent mounting of LCD and that's it.
124% SOC was something that went away when switching between 100% and 20% SOC. One minute at 100% SOC and proper value was saved.
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