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Can someone explain voltage drop to me. I have (2) 100aH Li batteries that my battery monitor shows while discharging is at 90% but running high draw devices i.e. 800w microwave -- the voltage can drop fast to 11V & trigger the low voltage shutdown -- I have 14.3V full w/ these 2 batteries...

I'd like to build a simple battery box for a trolling motor w/ (2) purposes. For motor use & solar trickle charge. I'd like to leave the solar trickle charge plugged in. Would I need a switch to toggle between motor use & trickle charging ? I want to avoid needing to open up the battery box...