Portable (suitcase) solar "install" question

BFL13 wrote:
The main reason to still keep the controller close to the battery is so the voltage drop between battery and controller does not mess up the controller set points.

The high set point will never be reached with voltage drop, because the controller will "see" the battery voltage as being higher than it really is, so that can leave the battery undercharged.

BS. When in bulk charge, all available current is provided - it makes exactly zero difference to charging where the voltage drop occurs. Voltage drop after the controller will cause the controller to go into constant voltage (i.e. absorp) mode slightly sooner than it otherwise would, but current and consequently voltage drop begin to taper off soon after that, anyway. Either way, whether current or time based, by the time the absorption stage is done there should be minimal current, and therefore minimal voltage drop. Same when in float - minimal current, minimal drop. Moving the controller closer to the battery does not affect the final results in any meaningful way.

It will definitely NOT cause a battery to be undercharged.