None of your DC circuits are isolated from the battery, thus whatever voltage you apply to the battery is also applied to all your DC circuits. Normally not an issue unless your charger supplies too high a voltage. The maximum recommended voltage for the circuit board on my refrigerator is 15.4vdc thus I set the maximum voltage setting on my solar charger to 15.3 so it will never go above that. Unless your charger has an equalize function, or can be set to a higher voltage "top off", or "mini Equalization" you'll probably never see too high a voltage even with temperature compensation.