I have a solar array in my rv charging a deep cycle battety through a smartSolar 100/20 charge controller. I also have a Progressive Dynamics PD4000 battery charger/power distribution block installed. I would like to use the load output to avoid over-discharge of my battery. However, I also would like to be able to use the PD4000 to charge the battery when AC power is available. My question is, can I connect the load output of the charge controller to the battery terminals of the PD4000? Under normal operation current will flow from the load output to the DC distribution block of the PD4000 and on to the various load circuits. When connected to AC power, current could flow in both directions, from the PD4000 charger to the battery through the load output or from the battery to the load. Can I do this or do I need to use the load output to control a relay/SSR connecting the battery to the PD4000?