Mechanical devices may have short duration high amp draws.
Generator or engine starter motors, are 2 examples that may or may not invoke the excessive discharge/shut down programming of the internal BMS. I have 2 Relion 100Ah low temp 12V batteries in parallel, and they have exhibited intermittent tendencies to shut down during generator starts. Usually, if I depress the gen prep button and hold it for 30 seconds before hitting the start button, it will fire up without issue. Starting the generator with chassis engine running also works/helps. I haven't tried the battery boost switch to start the chassis engine with help from the lithiums yet.
I'm also guessing that SoC of the battery(ies) will affect the decision making process for when the BMS will invoke the high draw shutdown.
It might be the only down side (besides price?) of lithium batteries. I am aware that some of the manufacturers also offer models that are less susceptible to this issue. Relion does, but I wanted the cold weather charging models.
