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Any straight forward reason not to use one PV panel.
There are two things to consider. The batteries can be full and if your loads are large, the controller will output power until it internally current limits, the panels are maxed, or the circuit breaker trips.The second is if you have a controller of dubious design, you should conservatively current limit the beast for safety sake. You probably do not want to start a fire.
..... last a lot longer then GCB's.Thoughts?
That statement makes it sound like the present batteries are not performing well, maybe failing. Or is it simply that they do not have have sufficient rated capacity to do the tasks being asked of them?