I've noticed something that seems odd to me in an LTspice simulation (see below).
I'm trying to model a system with a number of identical devices which each draw ~11W (with negligible variation over different input voltages) and are separated by long cable runs.
When the input voltage is 47.1V or higher then there is 'normal' voltage drop over the run and the last device (B17) would theoretically work happily.
When the input voltage is 47.0V or lower, the simulation shows huge voltage drops resulting very low voltage at the last device.
If anyone could point me in the right direction it would be much appreciated! It could be a quirk of the simulation, a case of garbage-in=garbage-out or a fundamental misunderstanding on my part :-)