Electrical Problems

+1 to what furpod says. You can usually hook different chargers/controllers to a battery (or pair of batteries) without harm. Batteries act like giant capacitors, and will tend to absorb whatever is dumped into them. We have remote communications sites with both AC and solar, and we just hook the battery outputs of both controllers directly to the batteries. We use one controller or the other (solar or AC) to run the load side of things. When we have sun, the solar provides most of the juice. When we have AC, the AC controller provides most of the juice. When both the sun and AC are AWOL, the batteries get to work.