1. voltage drop
Its the only thing that I encountered when charging lithium. Mainly with solar. The controllers voltage is always higher then actual battery voltage. This results in the controller not sending max amps to the battery. I notice this with 4 different controllers I tried both pwm and mppt.
I ... currently use 10 gauge pure copper going to the battery (2 feet away) and still get a .5 volts descrepency.
voltage drop can be a wiring problem but on solar systems, it's usually the controller that reads high. Some can be calibrated to match the battery terminals. On my system I replaced the wires going to battery several time and currently use 10 gauge pure copper going to the battery (2 feet away) and still get a .5 volts descrepency.
If your system has voltage drop whether wire problems or miscalibrated charger, you will probably never get a full charge on your battery and max amps going to the battery.
Not too many people check for voltage drop, I never did for years when using lead acid.
Did any of your solar controllers have separate voltage sense leads?1. voltage drop
Its the only thing that I encountered when charging lithium. Mainly with solar. The controllers voltage is always higher then actual battery voltage. This results in the controller not sending max amps to the battery. I notice this with 4 different controllers I tried both pwm and mppt.