Hi Vanners: I am building out a 1998 E 250 van and have a question about the electrical system. I will have two 125 Ah AGM batteries in the van that will be supplied by the engine alternator via a smart battery isolator and shore power. My question is do I need a charge controller to regulate the voltage when charging the batteries? I will also have a 1500 W inverter/Charger [Samlex Solar PST-1500-12 PST Series Pure Sine Wave Inverter] connected to the batteries. Just not sure if the inverter/charger and the battery isolator will overcharge the batteries. Any assistance is appreciated!