Yes, it will, and especially if you tend to use higher loads.
The levels will equalize out eventually, that is correct. but there are two things to consider ....IMV Figaro is correct with the water anology.
In my distant past the RN decided to teach us mechanical chappies electrics.
However the one bit of advice we received was to treat electric systems as plumbing
So in first photo water/electric is taken out of first tank/battery and the second one will equalize levels out eventually..
In second photo the water/electric is allowed to flow through and therefore out of both tanks/battery's..
Obviously as in plumbing the cable size between both battery's will have an effect.
But as stated... for our needs both are suitable but if going to do it why not take time to do properly.
The thing with electronics is the currents are very low and the voltages are very low.but neither battery knows which is the primary or which is the secondary.
Plus there’s wire directly connecting them.
I’d expect negligible difference but I’m looking at the diagram from an electronics career background rather than an electrical one
Yeah, but don't let people who actually have tested options stop people looking for reasons to do something wrongThese guys did some measuring, used some of their stuff in a boat in years gone by
Because it is easier to do it the wrong way and makes practically no difference for most installs.I am just amused at how many reasons and justifications are being given for cabling up incorrectly
Why not just do it right and be done with it!!