Yacht setup with Older Multiplus, Mase Genset Auto Start/Stop?, SoC accuracy and AC Input 1 ignored

DIY
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A battery monitor jumping to 100% too early and then running out of power when charging by solar is often a sign of incorrect settings in the battery monitor. See the FAQ linked below. The title matches your observations.

https://community.victronenergy.com/t/shunt-battery-monitor-jumping-to-100-or-reporting-a-high-soc-when-the-volts-are-low-and-or-the-bms-has-disconnected/88