Very nice, that looks good. You're doing great with the 6 gauge wire. Certainly, the ground wire is just as important as the positive wire. When doing ohms calculations for loss the distance should always be doubled in order to consider both wires. If I am not mistaken the PD-4045 is the "Mighty Mini" right? That is exactly what I intend to get soon to replace the TERRIBLE 20 amp unit currently in my trailer. That one does do an equalization charge at 14.4 volts for 15 minutes every 21 hours. It's not high enough voltage for the duration IMO, but it's a LOT better than most converters out there when it comes to battery
life. Indeed setting up a solar
system (always sounds funny) on the roof will be able to better maintain the batteries when driving. Beware the difference between MPPT and PWM, and even more so negative ground vs positive ground. Unfortunately almost ALL cheap PWM solar
controllers are positive ground. Renogy has a nice little plug and play unit that is negative ground. No display, but you already have all that sorted out. It's got a button to change the voltage for different batteries. I always run my batteries at the highest voltage the equipment will allow so I select AGM even though I have flooded cells. This means my batteries are in tip top shape when it comes to relative gravity and actual state of charge. The compromise being that I must check the water more often. No big deal. Better to do this with the solar
controller than the power converter though, since you want to take advantage of every bit of solar power
you can. The panels don't output 24/7 either, so the higher voltage can't harm anything.
The little PWM Renogy that is negative ground is called "Wanderer". It's buried in my closet behind things so I can't look. I'm pretty sure that's it though.
It does very very well for a PWM controller.